記述言語：英語   掲載種別：研究論文（学術雑誌）  

BACKGROUND: Aberrant DNA methylation is prevalent in colorectal serrated lesions. We previously reported that the CpG island of SMOC1 is frequently methylated in traditional serrated adenomas (TSAs) and colorectal cancers (CRCs) but is rarely methylated in sessile serrated lesions (SSLs). In the present study, we aimed to further characterize the expression of SMOC1 in early colorectal lesions. METHODS: SMOC1 expression was analyzed immunohistochemically in a series of colorectal tumors (n = 199) and adjacent normal colonic tissues (n = 112). RESULTS: SMOC1 was abundantly expressed in normal colon and SSLs while it was significantly downregulated in TSAs, advanced adenomas and cancers. Mean immunohistochemistry scores were as follows: normal colon, 24.2; hyperplastic polyp (HP), 18.9; SSL, 23.8; SSL with dysplasia (SSLD)/SSL with early invasive cancer (EIC), 15.8; TSA, 5.4; TSA with high grade dysplasia (HGD)/EIC, 4.7; non-advanced adenoma, 21.4; advanced adenoma, 11.9; EIC, 10.9. Higher levels SMOC1 expression correlated positively with proximal colon locations and flat tumoral morphology, reflecting its abundant expression in SSLs. Among TSAs that contained both flat and protruding components, levels of SMOC1 expression were significantly lower in the protruding components. CONCLUSION: Our results suggest that reduced expression of SMOC1 is associated with progression of TSAs and conventional adenomas and that SMOC1 expression may be a biomarker for diagnosis of serrated lesions and risk prediction in colorectal tumors.

DOI： 10.1186/s12876-024-03175-1

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

Histone modification, a major epigenetic mechanism regulating gene expression through chromatin remodeling, introduces dynamic changes in chromatin architecture. Protein arginine methyltransferase 6 (PRMT6) is overexpressed in various types of cancer, including prostate, lung and endometrial cancer (EC). Epigenome regulates the expression of endogenous retrovirus (ERV), which activates interferon signaling related to cancer. The antitumor effects of PRMT6 inhibition and the role of PRMT6 in EC were investigated, using epigenome multi‑omics analysis, including an assay for chromatin immunoprecipitation sequencing (ChIP‑seq) and RNA sequencing (RNA‑seq). The expression of PRMT6 in EC was analyzed using reverse transcription‑quantitative polymerase chain reaction (RT‑qPCR) and immunohistochemistry (IHC). The prognostic impact of PRMT6 expression was evaluated using IHC. The effects of PRMT6‑knockdown (KD) were investigated using cell viability and apoptosis assays, as well as its effects on the epigenome, using ChIP‑seq of H3K27ac antibodies and RNA‑seq. Finally, the downstream targets identified by multi‑omics analysis were evaluated. PRMT6 was overexpressed in EC and associated with a poor prognosis. PRMT6‑KD induced histone hypomethylation, while suppressing cell growth and apoptosis. ChIP‑seq revealed that PRMT6 regulated genomic regions related to interferons and apoptosis through histone modifications. The RNA‑seq data demonstrated altered interferon‑related pathways and increased expression of tumor suppressor genes, including NK6 homeobox 1 and phosphoinositide‑3‑kinase regulatory subunit 1, following PRMT6‑KD. RT‑qPCR revealed that eight ERV genes which activated interferon signaling were upregulated by PRMT6‑KD. The data of the present study suggested that PRMT6 inhibition induced apoptosis through interferon signaling activated by ERV. PRMT6 regulated tumor suppressor genes and may be a novel therapeutic target, to the best of our knowledge, in EC.

DOI： 10.3892/ijo.2024.5620

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

We performed comprehensive analyses of somatic copy number alterations (SCNAs) and gene expression profiles of gastric intramucosal neoplasia (IMN) using array-based methods in 97 intestinal-type IMNs, including 39 low-grade dysplasias (LGDs), 37 high-grade dysplasias (HGDs), and 26 intramucosal carcinomas (IMCs) with stromal invasion of the lamina propria to identify the molecular mechanism of IMN. In addition, we examined gene mutations using gene panel analyses. We used cluster analyses for exclusion of arbitrariness to identify SCNA patterns and expression profiles. IMNs were classified into two distinct subgroups (subgroups 1 and 2) based on SCNA patterns. Subgroup 1 showed a genomic stable pattern due to the low frequency of SCNAs, whereas subgroup 2 exhibited a chromosomal instability pattern due to the high frequencies of SCNAs and TP53 mutations. Interestingly, although the frequencies of LGD and HGD were significantly higher in subgroup 1 than in subgroup 2, IMC was commonly found in both types. Although the expression profiles of specific mRNAs could be used to categorise subgroups 1 and 2, no clinicopathological findings correlated with either subgroup. We examined signalling pathways specific to subgroups 1 and 2 to identify the association of each subgroup with signalling pathways based on gene ontology tree visualisation: subgroups 1 and 2 were associated with haem metabolism and chromosomal instability, respectively. These findings reveal a comprehensive genomic landscape that highlights the molecular complexity of IMNs and provide a road map to facilitate our understanding of gastric IMNs.

DOI： 10.1002/2056-4538.12368

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

The current study's objective was to elucidate some currently unknown biological indicators to evaluate the biological nature of cancer-associated fibroblasts (CAFs). For this purpose, four different CAFs, CAFS1, CAFS2, SCC17F and MO-1000, were established using surgical specimens from oral squamous cell carcinomas (OSCC) with different clinical malignant stages (CAFS1 and CAFS2, T2N0M0, stage II; SCC17F and MO-1000, T4aN2bM0, stage IVA). Fibroblasts unrelated to cancer (non-CAFs) were also prepared and used as controls. Initially, confirmation that these four fibroblasts were indeed CAFs was obtained by their mRNA expression using positive and negative markers for the CAF or fibroblasts. To elucidate possible unknown biological indicators, these fibroblasts were subjected to a cellular metabolic analysis by a Seahorse bioanalyzer, in conjugation with 3D spheroid cultures of the cells and co-cultures with a pancreas ductal carcinoma cell line, MIA PaCa-2. The mitochondrial and glycolytic functions of human orbital fibroblasts (HOF) were nearly identical to those of Graves'-disease-related HOF (GOF). In contrast, the characteristics of the metabolic functions of these four CAFs were different from those of human conjunctival fibroblasts (HconF), a representative non-CAF. It is particularly noteworthy that CAFS1 and CAFS2 showed markedly reduced ratios for the rate of oxygen consumption to the extracellular acidification rate, suggesting that glycolysis was enhanced compared to mitochondrial respiration. Similarly, the physical aspects, their appearance and stiffness, of their 3D spheroids and fibroblasts that were induced effects based on the cellular metabolic functions of MIA PaCa-2 were also different between CAFs and non-CAFs, and their levels for CAFS1 or SCC17F were similar to those for CAFS2 or MO-1000 cells, respectively. The findings reported herein indicate that cellular metabolic functions and the physical characteristics of these types of 3D spheroids may be valuable and useful indicators for estimating potential biological diversity among various CAFs.

DOI： 10.3390/cells12172160

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

We previously showed that upregulation of adipocyte enhancer-binding protein 1 (AEBP1) in vascular endothelial cells promotes tumor angiogenesis. In the present study, we aimed to clarify the role of stromal AEBP1/ACLP expression in oral squamous cell carcinoma (OSCC). Immunohistochemical analysis showed that ACLP is abundantly expressed in cancer-associated fibroblasts (CAFs) in primary OSCC tissues and that upregulated expression of ACLP is associated with disease progression. Analysis using CAFs obtained from surgically resected OSCCs showed that the expression of AEBP1/ACLP in CAFs is upregulated by co-culture with OSCC cells or treatment with TGF-β1, suggesting cancer-cell-derived TGF-β1 induces AEBP1/ACLP in CAFs. Collagen gel contraction assays showed that ACLP contributes to the activation of CAFs. In addition, CAF-derived ACLP promotes migration, invasion, and in vivo tumor formation by OSCC cells. Notably, tumor stromal ACLP expression correlated positively with collagen expression and correlated inversely with CD8+ T cell infiltration into primary OSCC tumors. Boyden chamber assays suggested that ACLP in CAFs may attenuate CD8+ T cell migration. Our results suggest that stromal ACLP contributes to the development of OSCCs, and that ACLP is a potential therapeutic target.

DOI： 10.3390/cancers15174303

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掲載種別：研究論文（学術雑誌）   出版者・発行元：Springer Science and Business Media LLC  

Abstract

Long noncoding RNAs (lncRNAs) play pivotal roles in tumor development. To identify dysregulated lncRNAs in gastric cancer (GC), we analyzed genome-wide trimethylation of histone H3 lysine 4 (H3K4me3) to screen for transcriptionally active lncRNA genes in the non-tumorous gastric mucosa of patients with GC and healthy individuals. We found that H3K4me3 at TM4SF1-AS1 was specifically upregulated in GC patients and that the expression of TM4SF1-AS1 was significantly elevated in primary and cultured GC cells. TM4SF1-AS1 contributes to GC cell growth in vitro and in vivo, and its oncogenic function is mediated, at least in part, through interactions with purine-rich element-binding protein α (Pur-α) and Y-box binding protein 1 (YB-1). TM4SF1-AS1 also activates interferon signaling in GC cells, which is dependent on Pur-α and RIG-I. Chromatin isolation by RNA purification (ChIRP)-mass spectrometry demonstrated that TM4SF1-AS1 was associated with several stress granule (SG)-related proteins, including G3BP2, RACK1, and DDX3. Notably, TM4SF1-AS1 promoted SG formation and inhibited apoptosis in GC cells by sequestering RACK1, an activator of the stress-responsive MAPK pathway, within SGs. TM4SF1-AS1-induced SG formation and apoptosis inhibition are dependent on Pur-α and YB-1. These findings suggested that TM4SF1-AS1 contributes to tumorigenesis by enhancing SG-mediated stress adaptation.

その他リンク： https://www.nature.com/articles/s41419-023-05953-3

DOI： 10.1038/s41419-023-05953-3

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

While there is growing evidence that many epigenetically silenced genes in cancer are tumour suppressor candidates, their significance in cancer biology remains unclear. Here, we identify human Neuralized (NEURL), which acts as a novel tumour suppressor targeting oncogenic Wnt/β-catenin signalling in human cancers. The expression of NEURL is epigenetically regulated and markedly suppressed in human colorectal cancer. We, therefore, considered NEURL to be a bona fide tumour suppressor in colorectal cancer and demonstrate that this tumour suppressive function depends on NEURL-mediated oncogenic β-catenin degradation. We find that NEURL acts as an E3 ubiquitin ligase, interacting directly with oncogenic β-catenin, and reducing its cytoplasmic levels in a GSK3β- and β-TrCP-independent manner, indicating that NEURL-β-catenin interactions can lead to a disruption of the canonical Wnt/β-catenin pathway. This study suggests that NEURL is a therapeutic target against human cancers and that it acts by regulating oncogenic Wnt/β-catenin signalling.

DOI： 10.15252/embr.202256335

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記述言語：日本語   出版者・発行元：(一社)日本病理学会  

医中誌

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

BACKGROUND AND AIM: The tumor microenvironment plays an essential role in the development and progression of colorectal cancer (CRC). We recently reported that crosstalk between CRC cells and tumor-associated macrophages (TAMs) via serum amyloid A1 (SAA1) promotes invasion by T1 CRCs. In the present study, we aimed to clarify the role of neutrophils in early CRCs. METHODS: Immunohistochemical analysis of CD66b, chemokine CXC motif ligand 8 (CXCL8 or interleukin-8, IL-8) and matrix metalloproteinase-9 (MMP-9) was performed using primary T1 CRCs (n = 49). The HL-60 human promyelocytic leukemia cell line and THP-1 human monocytic leukemia cell line were used to obtain neutrophil-like and macrophage-like cells, respectively. Boyden chamber assays were used to analyze cell migration and invasion, and quantitative RT-PCR was used to analyze gene expression. RESULTS: Immunohistochemical analysis revealed accumulation of neutrophils at the SAA1-positive invasive front of T1 CRCs. Experiments using HL-60 cells suggested that treatment with SAA1 induced neutrophil migration and expression of CXCL8 and MMP-9 in neutrophils and that neutrophils promote CRC cell migration and invasion. Immunohistochemistry confirmed accumulation of CXCL8- or MMP-9-positive neutrophils at the SAA1-positive invasive front of T1 CRCs. Moreover, co-culture experiments using CRC, THP-1 and HL-60 cells suggested that CRC cells activated by macrophages upregulate CXCL8 and MMP-9 in neutrophils. CONCLUSIONS: Our results suggest that interplay between macrophages and CRC cells leads to recruitment of neutrophils to the invasive front of T1 CRCs and that SAA1 secreted by CRC cells activate neutrophils to promote invasion.

DOI： 10.1111/jgh.16055

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

BACKGROUND: The CXCL12/CXCR4 axis plays a pivotal role in the progression of various malignancies, including oral squamous cell carcinoma (OSCC). In this study, we aimed to clarify the biological and clinical significance of CXCL12 in the tumor microenvironment of OSCCs. METHODS: Publicly available single-cell RNA-sequencing (RNA-seq) datasets were used to analyze CXCL12 expression in head and neck squamous cell carcinomas (HNSCC). Immunohistochemical analysis of CXCL12, α-smooth muscle antigen (α-SMA), fibroblast activation protein (FAP) and CD8 was performed in a series of 47 surgically resected primary tongue OSCCs. Human skeletal muscle cells were co-cultured with or without OSCC cells, after which CXCL12 expression was analyzed using quantitative reverse-transcription PCR. RESULTS: Analysis of the RNA-seq data suggested CXCL12 is abundantly expressed in stromal cells within HNSCC tissue. Immunohistochemical analysis showed that in grade 1 primary OSCCs, CXCL12 is expressed in both tumor cells and muscle cells. By contrast, grade 3 tumors were characterized by disruption of muscle structure and reduced CXCL12 expression. Quantitative analysis of CXCL12-positive areas within tumors revealed that reduced CXCL12 expression correlated with poorer overall survival. Levels of CXCL12 expression tended to inversely correlate α-SMA expression and positively correlate with infiltration by CD8+ lymphocytes, though these relations did not reach statistical significance. CXCL12 was significantly upregulated in muscle cells co-cultured with OSCC cells. CONCLUSION: Our results suggest that tongue OSCC cells activate CXCL12 expression in muscle cells, which may contribute to tumor progression. However, CXCL12 is reduced in advanced OSCCs due to muscle tissue destruction.

DOI： 10.1002/cam4.5392

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

BACKGROUND: Metastasis of colorectal cancer (CRC) is a major cause of CRC-related mortality. However, the detailed molecular mechanism of CRC metastasis remains unknown. A recent study showed that the tumor microenvironment, which includes cancer cells and the surrounding stromal cells, plays a major role in tumor invasion and metastasis. Identification of altered messenger RNA (mRNA) expression in the tumor microenvironment is essential to elucidation of the mechanisms responsible for tumor progression. This study investigated the mRNA expression of genes closely associated with metastatic CRC compared with non-metastatic CRC. METHODS: The samples examined were divided into cancer tissue and isolated cancer stromal tissue. The study examined altered mRNA expression in the cancer tissues using The Cancer Genome Atlas (TCGA) (377cases) and in 17 stromal tissues obtained from our laboratory via stromal isolation using an array-based analysis. In addition, 259 patients with CRC were enrolled to identify the association of the candidate markers identified with the prognosis of patients with stage 2 or 3 CRC. The study examined the enriched pathways identified by gene set enrichment analysis (GSEA) based on the Kyoto Encyclopedia of Genes and Genomes (KEGG) module in both the TCGA dataset and isolated stromal tissue. RESULTS: As a result, whereas tenascin-C, secreted phosphoprotein 1 and laminin were expressed in metastatic CRC cells, olfactory receptors (ORs) 11H1 and OR11H4 were expressed in stromal tissue cells isolated from metastatic CRC cases. Finally, upregulated expression of tenascin-C and OR11H4 was correlated with the outcome for CRC patients. CONCLUSION: The authors suggest that upregulated expression levels of tenascin-C and OR11H1 play an important role in CRC progression.

DOI： 10.1245/s10434-022-12574-1

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1245/s10434-022-12629-3

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

BACKGROUND: The objective of this study was to elucidate the association between neoplastic progression and somatic copy number alterations (SCNAs) occurring within the same colorectal cancer (CRC) tumor. METHODS: We investigated SCNAs to identify the progression from a high-grade intramucosal lesion (HGIL) to an invasive front lesion (IFL), via an invasive submucosal lesion (ISL), within the same tumor using a crypt isolation method combined with a SNP array. Immunohistochemistry was also performed. RESULTS: We identified 51 amplified genes that potentially promote progression from HGIL to ISL and 6 amplified genes involved in the progression from ISL to IFL. Of the 51 genes involved in HGIL to ISL progression, TORC1, MSLN, and STUB1, which are closely associated with CRC, were identified as candidate markers of submucosal invasion. However, no candidate genes were identified among the six genes associated with ISL to IFL progression. In addition, the number of total SCNAs and the number of gains were correlated with cancer progression (from HGIL to IFL). Finally, immunohistochemistry revealed higher expression of TORC1, MSLN, and STUB1 in ISL than in HGIL. CONCLUSIONS: These results suggest that specific SCNAs are required for acquisition of invasive ability in CRC, and the affected genes are potential markers of invasion.

DOI： 10.1002/cam4.5117

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

Precursor lesions that progress into colorectal cancer (CRC) could be largely classified into sessile serrated lesions (SSLs), traditional serrated adenoma (TSA), and tubular adenoma (TA). We aimed to determine whether high expression of trefoil factor 1 (TFF1) is closely associated with serrated lesions, particularly SSLs. The samples were divided into the first (12 SSLs, 5 TSAs, and 15 TAs) and second cohorts (15 SSLs, 9 TSAs, and 15 TAs). First, we investigated TFF1 expression in isolated gland samples using array-based and reverse-transcription PCR. Second, we performed immunohistochemical analysis of TFF1 expression in paraffin-embedded tissues obtained from SSL, TSA, TA, and hyperplastic polyp (HP) samples. In addition, we compared TFF1 mRNA levels between SSLs and HPs. TFF1 expression was significantly higher in SSLs than in TSA and TA in both cohorts. Additionally, immunohistochemical staining of TFF1 in the HP, SSL, TSA, and TA samples revealed significant differences in the immunohistochemical scores of TFF1 among the four types of lesions (higher expression in SSLs than in the other three lesions). Finally, there were significant differences in TFF1 mRNA expression levels between SSLs and HPs in paraffin-embedded tissues. However, there was considerable overlap in the immunohistochemical scores and expression levels of TFF1 transcripts between SSLs and HPs. The current findings may help elucidate the molecular mechanisms involved in serrated lesion development. In addition, we suggest that despite the limited practical application, upregulation of TFF1 transcripts may help differentiate SSLs from other lesions.

DOI： 10.1016/j.prp.2022.153987

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

INTRODUCTION: Hepatoblastoma (HB) is the most common paediatric liver tumour, and epigenetic aberrations may be important in HB development. Recently, the Children's Hepatic Tumors International Collaboration-Hepatoblastoma Stratification (CHIC-HS) developed risk stratification based on clinicopathological factors. This study aimed to construct a more accurate model by integrating CHIC-HS with molecular factors based on DNA methylation. METHODS: HB tumour specimens (N = 132) from patients treated with the Japanese Pediatric Liver Tumors Group-2 protocol were collected and subjected to methylation analysis by bisulfite pyrosequencing. Associations between methylation status and clinicopathological factors, overall survival (OS), and event-free survival (EFS) were retrospectively analysed. We investigated the effectiveness of the evaluation of methylation status in each CHIC-HS risk group and generated a new risk stratification model. RESULTS: Most specimens (82%) were from post-chemotherapy tissue. Hypermethylation in ≥2 of the four genes (RASSF1A, PARP6, OCIAD2, and MST1R) was significantly associated with poorer OS and EFS. Multivariate analysis indicated that ≥2 methylated genes was an independent prognostic factor (hazard ratios of 6.014 and 3.684 for OS and EFS, respectively). Two or more methylated genes was also associated with poorer OS in the CHIC-very low (VL)-/low (L)-risk and CHIC-intermediate (I) risk groups (3-year OS rates were 83% vs. 98% and 50% vs. 95%, respectively). The 3-year OS rates of the VL/L, I, and high-risk groups in the new stratification model were 98%, 90%, and 62% (vs. CHIC-HS [96%, 82%, and 65%, respectively]), optimising CHIC-HS. CONCLUSIONS: Our proposed stratification system considers individual risk in HB and may improve patient clinical management.

DOI： 10.1016/j.ejca.2022.06.013

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

mRNA expression varies in human cancers. Such altered mRNA expression is negatively regulated by the expression of microRNAs (miRNAs), which play an important role in human tumorigenesis. According to this theory, inverse mRNA/miRNA expression may be a direct driver of cancer development, and certain genetic events may occur prior to the development of any discernible histological abnormalities. We examined the inverse expression between mRNAs and their corresponding miRNAs in colorectal cancer (CRC) and adjacent normal mucosa and performed pathway analysis to identify mRNA/miRNA networks. The cancer samples were divided into first (20 cases) and second (24 cases) cohorts, and 48 samples were obtained from two sections of the normal mucosa adjacent to the tumors from the second cohort. We investigated mRNAs with commonly altered expression in CRC and adjacent normal mucosa using isolated cancer glands and normal crypts from the first cohort, compared with that of distal normal crypts, using an array-based method. As a result, significant inverse correlations between CEACAM1 and miRNA-7114-5p and between AK1 and miRNA-6780-5p were found in CRC and adjacent normal mucosa. We validated these correlations in the second cohort using RT-PCR. To confirm these findings, transfection and immunohistochemical assays were also performed, which verified the inverse correlation between CEACAM1 and miRNA-7114-5p. Our findings suggest that the inverse correlations between the CEACAM1/miRNA-7114-5p and possibly AK1/miRNA-6780-5p pairs play an important role in early CRC development, and may help identify potential molecular targets for early detection of CRC.

DOI： 10.1002/cjp2.268

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

Colorectal adenocarcinoma (CRA) is characterized by marked heterogeneity and may be composed of an admixture of various histologic patterns, including well-formed gland and cribriform types. Although tumors displaying a prominent or predominant cribriform feature are frequently found in CRA, this type may contain specific histologic variants with a characteristic molecular alteration. We investigated the molecular features of 51 primary CRAs with a predominant cribriform histology using array-based analyses [somatic copy number alterations (SCNAs); mRNA expression]. Mutations (TP53, KRAS, PIK3CA and BRAF) and DNA methylation status were also analyzed. The crypt isolation method was used to obtain isolated tumor glands of each type separately. All patients were classified by their CRA histologic subtype into two groups: well-formed gland and cribriform. Next, we performed cluster analysis to stratify SCNA and mRNA expression patterns between the two subtypes. Two distinctive subgroups were stratified based on patterns of SCNA and mRNA expression and were correlated with each histologic subtype. The cribriform type was characterized by a high frequency of SCNA compared with that of the well-formed gland type and was closely associated with the expression of specific mRNAs. In addition, the frequency of KRAS mutation was significantly higher in the cribriform type than in the well-formed gland type. Finally, there was no difference in DNA methylation status between the two subtypes. Overall, these data suggest that the cribriform type provides important insights into colorectal carcinogenesis, suggesting specific potential histologic implications based on the molecular profile.

DOI： 10.1093/carcin/bgac029

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

BACKGROUND: No effective early diagnostic biomarkers are available for colorectal cancer (CRC). Therefore, we sought to identify new biomarkers that could identify CRC from progression as a pre-cancerous lesion to its invasive form. Recent studies have shown that microRNAs (miRs) are associated with the onset of cancer invasion and progression. AIMS: We hypothesized that the identification of miRs associated with CRC might be useful to detect this disease at early stages. METHODS: We conducted an integrated analysis of 79 isolated colorectal tumor glands, including adenomas, intramucosal cancers, and invasive CRCs that showed a microsatellite stable phenotype using GeneChip miRNA 4.0 microarray assays. The colorectal tumors we examined were divided into 2 cohorts (42 in the first cohort and 37 in the second cohort). RESULTS: First, cluster analysis was performed to stratify expression patterns of multiple miRs that were pooled according to the following criteria: fold change in expression (< -2.0 or > 2.0), p < 0.05, and mature miRs. As a result, the expression patterns of pooled miRs were subdivided into 3 subgroups that were correlated with tumor grade. Each subgroup was characterized by specific miRs. In addition, we found that specific miRs, including miR-140-3p and miR-378i, were closely associated with cancer invasion. Finally, we analyzed paired dysregulated miRs between adenomatous and cancerous components present within the same tumor. DISCUSSION: We showed that several miRs were dysregulated during progression from adenoma to intramucosal cancer. Specific miRs may have key roles in progression from intramucosal tumor to invasive CRC.

DOI： 10.1007/s10620-022-07576-8

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

Loss-of-function mutations in RNF43 induce activation of Wnt ligand-dependent Wnt/β-catenin signaling through stabilization of the Frizzled receptor, which is often found in microsatellite instability (MSI)-type colorectal cancer (CRC) that develops from sessile serrated adenomas. However, the mechanism underlying how RNF43 mutations promote tumorigenesis remains poorly understood. In this study, we established nine human CRC-derived organoids and found that three organoid lines carried RNF43 frameshift mutations associated with MSI-high and BRAFV600E mutations, suggesting that these CRCs developed through the serrated pathway. RNF43 frameshift mutant organoids required both Wnt ligands and R-spondin for proliferation, indicating that suppression of ZNRF3 and retained RNF43 function by R-spondin are required to achieve an indispensable level of Wnt activation for tumorigenesis. However, active β-catenin levels in RNF43-mutant organoids were lower than those in APC two-hit mutant CRC, suggesting a lower threshold for Wnt activation in CRC that developed through the serrated pathway. Interestingly, transplantation of RNF43-mutant organoids with intestinal myofibroblasts accelerated the β-catenin nuclear accumulation and proliferation of xenograft tumors, indicating a key role of stromal cells in the promotion of the malignant phenotype of RNF43-mutant CRC cells. Sequencing of subcloned organoid cell-expressed transcripts revealed that two organoid lines carried monoallelic RNF43 cis-mutations, with two RNF43 frameshift mutations introduced in the same allele and the wild-type RNF43 allele remaining, while the other organoid line carried two-hit biallelic RNF43 trans-mutations. These results suggest that heterozygous RNF43 frameshift mutations contribute to CRC development via the serrated pathway; however, a second-hit RNF43 mutation may be advantageous in tumorigenesis compared with a single-hit mutation through further activation of Wnt signaling. Finally, treatment with the PORCN inhibitor significantly suppressed RNF43-mutant cell-derived PDX tumor development. These results suggest a novel mechanism underlying RNF43 mutation-associated CRC development and the therapeutic potential of Wnt ligand inhibition against RNF43-mutant CRC. © 2022 The Authors. The Journal of Pathology published by John Wiley & Sons Ltd on behalf of The Pathological Society of Great Britain and Ireland.

DOI： 10.1002/path.5868

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記述言語：日本語   出版者・発行元：(一社)日本病理学会  

医中誌

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記述言語：日本語   出版者・発行元：(一財)日本消化器病学会  

医中誌

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

We aimed to assess some of the potential genetic pathways for cancer development from non-malignant intraductal papillary mucinous neoplasm (IPMN) by evaluating genetic mutations and methylation. In total, 46 dissected regions in 33 IPMN cases were analyzed and compared between malignant-potential and benign cases, or between malignant-potential and benign tissue dissected regions including low-grade IPMN dissected regions accompanied by malignant-potential regions. Several gene mutations, gene methylations, and proteins were assessed by pyrosequencing and immunohistochemical analysis. RASSF1A methylation was more frequent in malignant-potential dissected regions (p = 0.0329). LINE-1 methylation was inversely correlated with GNAS mutation (r =  - 0.3739, p = 0.0105). In cases with malignant-potential dissected regions, GNAS mutation was associated with less frequent perivascular invasion (p = 0.0128), perineural invasion (p = 0.0377), and lymph node metastasis (p = 0.0377) but significantly longer overall survival, compared to malignant-potential cases without GNAS mutation (p = 0.0419). The presence of concordant KRAS and GNAS mutations in the malignant-potential and benign dissected regions were more frequent among branch-duct IPMN cases than among the other types (p = 0.0319). Methylation of RASSF1A, CDKN2A, and LINE-1 and GNAS mutation may be relevant to cancer development, IPMN subtypes, and cancer prognosis.

DOI： 10.1038/s41598-021-04335-z

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

Background: Although MicroRNAs (miRNAs) play important roles in various biological processes, the biological functions of miRNAs are achieved through mRNAs. The aim of this study is to identify dysregulated miRNA/mRNA expression patterns in colorectal tumors. Methods: We examined 42 colorectal tumors [15 adenomas, 8 intramucosal cancers (IMCs), and 19 invasive colorectal cancers (CRCs)] with the microsatellite stable (MSS) phenotype (first cohort). The first cohort was used for genome-wide miRNA and mRNA expression arrays, whereas the second cohort (37 colorectal neoplasias) was used for validation analyses. Finally, we used 15 cases of "adenoma in/with carcinoma" to identify network patterns of miRNAs/mRNAs that were directly associated with neoplastic progression. In addition, simple regression analysis for array-based and RT-PCR analyses was performed to select candidate miRNA-mRNA pairs. Transfection of miRNA mimics was also performed to confirm whether target mRNA expression is affected by specific miRNAs. Results: Specific paired miRNA/mRNA networks, including hsa-miR-34a-5p/SLC12A2, hsa-miR-15b-5p/SLC12A2, hsa-miR-195-5p/SLC12A2, hsa-miRNA-502-3p/OLFM4, hsa-miRNA-6807-5p/ZG16, and hsa-miRNA 3064-5p/SH3BGRL3, were identified in samples of adenoma, IMC, and CRC with the MSS phenotype. In adenomatous lesions obtained from the same tumor with a carcinomatous lesion, we identified pairs of miRNA-130a-3p/HSPA8 and miRNA-22-3p/RP53 that were linked to multiple pathways. On the other hand, 2 pairs of miRNA/mRNA (miRNA-660-5p and miRNA-664a-5p/APP) were found in isolated carcinomatous glands. Ectopic expression of miRNA 3064-5p suppressed SH3BGRL3 expression. Conclusions: We found that networks based on specific pairs of miRNAs/mRNAs contribute to progression from adenomatous and carcinomatous lesions. Our results provide insights into the molecular tumorigenesis of colorectal tumors.

DOI： 10.3389/fonc.2022.831100

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

MicroRNA (miRNA) expression is dysregulated in human tumors, thereby contributing to tumorigenesis through altered expression of mRNA. Thus, identification of the relationships between miRNAs and mRNAs is important for evaluating the molecular mechanisms of tumors. Additionally, elucidation of the molecular features of serrated lesions is essential in colorectal tumorigenesis. Here, we examined the relationships of miRNA and mRNA expressed in serrated lesions, including 26 sessile serrated lesions (SSLs), 12 traditional serrated adenomas (TSAs), and 11 colorectal cancers (CRCs) with a microsatellite instability (MSI) phenotype using crypt isolation. We divided the samples into the first and second cohorts for validation. Array-based expression analyses were used to evaluate miRNAs and mRNAs with opposite expression patterns in isolated tumor glands. In addition, we validated the relationships of miRNA/mRNA pairs in the second cohort using real-time polymerase chain reaction. We found that the expression of miRNA-5787 was correlated with reciprocal expression of 2 mRNAs, i.e., SRRM2 and POLR2J3, in SSL samples. In TSA samples, 2 pairs of miRNAs/mRNAs showing opposite expression patterns, i.e., miRNA-182-5p/ETF1 and miRNA-200b-3p/MYB, were identified. Ultimately, three pairs of miRNAs/mRNAs with opposite expression patterns, including miRNA-222-3p/SLC26A3, miRNA-6753-3p/FABP1, and miRNA-222-3p/OLFM4, were retained in CRC with an MSI phenotype. Finally, we performed transfection with an miR-222-3p mimic to confirm the expression of SLC26A3 and OLFM4; the results showed that ectopic expression of miR-222-3p moderately suppressed OLFM4 and downregulated SLC26A3 to some extent. Overall, our results provided basic insights into the evaluation of colorectal tumorigenesis of serrated lesions and CRC with an MSI phenotype. This article is protected by copyright. All rights reserved.

DOI： 10.1002/gcc.23016

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

Long noncoding RNAs (lncRNAs) are deeply involved in cancer development. We previously reported that DLEU1 (deleted in lymphocytic leukemia 1) is one of the lncRNAs overexpressed in oral squamous cell carcinoma (OSCC) cells, where it exhibits oncogenic activity. In the present study, we further clarified the molecular function of DLEU1 in the pathogenesis of OSCC. Chromatin immunoprecipitation-sequencing (ChIP-seq) analysis revealed that DLEU1 knockdown induced significant changes in the levels of histone H3 lysine 4 trimethylation (H3K4me3) and H3K27 acetylation (H3K27ac) in OSCC cells. Notably, DLEU1 knockdown suppressed levels of H3K4me3/ H3K27ac and expression of a number of interferon-stimulated genes (ISGs), including IFIT1, IFI6 and OAS1, while ectopic DLEU1 expression activated these genes. Western blot analysis and reporter assays suggested that DLEU1 upregulates ISGs through activation of JAK-STAT signaling in OSCC cells. Moreover, IFITM1, one of the ISGs induced by DLUE1, was frequently overexpressed in primary OSCC tumors, and its knockdown inhibited OSCC cell proliferation, migration and invasion. These findings suggest that DLEU1 exerts its oncogenic effects, at least in part, through activation of a series ISGs in OSCC cells.

DOI： 10.1038/s41598-021-99736-5

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記述言語：英語   出版者・発行元：(一社)日本癌学会  

医中誌

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記述言語：英語   出版者・発行元：(一社)日本癌学会  

医中誌

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記述言語：英語   出版者・発行元：(一社)日本癌学会  

医中誌

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記述言語：英語   出版者・発行元：(一社)日本癌学会  

医中誌

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記述言語：英語   出版者・発行元：(一社)日本癌学会  

医中誌

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記述言語：日本語   出版者・発行元：日本消化器病学会-北海道支部  

医中誌

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

Aberrant expression of tight junction proteins has recently been focused on in the cancer research field. We previously showed that claudin-1 is aberrantly expressed from an early stage of uterine cervical adenocarcinoma and contributes to malignant potentials. To elucidate the molecular mechanisms underlying tumor-promoting roles of claudin-1, we established and analyzed claudin-1 knockout cells. Knockout of claudin-1 suppressed conventional tight junctional functions, barrier and fence functions, and expression of cell adhesion-associated proteins including E-cadherin. Comparative proteome analysis revealed that expression of claudin-1 affected expression of a wide range of proteins, especially proteins that are associated with cell adhesion and actin cytoskeleton remodeling. Interactome analysis of the identified proteins revealed that E-cadherin and focal adhesion kinase play central roles in the claudin-1-dependently affected protein network. Moreover, knockout of claudin-1 significantly suppressed microvilli formation and activity of Ezrin/Radixin/Moesin. Taken together, the results indicate that expression of claudin-1 affects not only conventional tight junction function but also expression and activity of a wide range of proteins, especially proteins that are associated with cell adhesion and actin cytoskeleton remodeling, to contribute to malignant potentials and microvilli formation in cervical adenocarcinoma cells.

DOI： 10.1016/j.bbrc.2021.05.070

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

Submucosal invasion and lymph node metastasis are important issues affecting treatment options for early colorectal cancer (CRC). In this study, we aimed to unravel the molecular mechanism underlying the invasiveness of early CRCs. We performed RNA-sequencing (RNA-seq) with poorly differentiated components (PORs) and their normal counterparts isolated from T1 CRC tissues, and detected significant upregulation of SAA1 in PORs. Immunohistochemical analysis revealed that SAA1 was specifically expressed in PORs at the invasive front of T1b CRCs. Upregulation of SAA1 in CRC cells promoted cell migration and invasion. Co-culture experiments using CRC cell lines and THP-1 cells suggested that interleukin 1β (IL-1β) produced by macrophages induces SAA1 expression in CRC cells. Induction of SAA1 and promotion of CRC cell migration and invasion by macrophages were inhibited by blocking IL-1β. These findings were supported by immunohistochemical analysis of primary T1 CRCs showing accumulation of M1-like/M2-like macrophages at SAA1-positive invasive front regions. Moreover, SAA1 produced by CRC cells stimulated upregulation of MMP-9 in macrophages. Our data suggest that tumor-associated macrophages at the invasive front of early CRCs promote cancer cell migration and invasion through induction of SAA1, and that SAA1 may be a predictive biomarker and a useful therapeutic target.

DOI： 10.1111/cas.15080

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

Identification of molecular alterations occurring in the adenomatous and carcinomatous components within the same tumor would greatly enhance understanding of the neoplastic progression of colorectal cancer. We examined somatic copy number alterations (SCNAs) and mRNA expression at the corresponding loci involved in the adenoma-carcinoma sequence in the isolated adenomatous and cancer glands of the same tumor in 15 cases of microsatellite-stable "carcinoma in adenoma," using genome-wide SNP and global gene expression arrays. Multiple copy-neutral loss of heterozygosity events were detected at 4q13.2, 15q15.1, and 14q24.3 in the adenomatous component and at 4q13.2, 15q15.1, and 14q24.3 in the carcinomatous component. There were significant differences in the copy number (CN) gain frequencies at 20q11.21-q13.33, 8q13.3, 8p23.1, and 8q21.2-q22.2 between the adenomatous and carcinomatous components. Finally, we found a high frequency of five genotypes involving CN gain with upregulated expression of the corresponding gene (RPS21, MIR3654, RSP20, SNORD54, or ASPH) in the carcinomatous component, whereas none of these genotypes were detected in the adenomatous component. This finding is interesting in that CN gain with upregulated gene expression may enhance gene function and play a crucial role in the progression of an adenoma into a carcinomatous lesion.

DOI： 10.1111/pin.13129

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

Mutations in BRAF are important events in colorectal serrated lesions and specific genetic markers for the serrated pathway. However, examination of BRAF mutations is not easy in routine histopathologic analyses. Here, the authors examined 73 colorectal serrated lesions, including 21 hyperplastic polyps, 32 traditional serrated adenomas, and 30 sessile serrated lesions, for comparison of BRAF mutation status with immunopositive expression of the anti-BRAF V600E mutation-specific antibody VE1. Thirty-two tubular adenomas (TAs) were examined as controls. In addition, 5 examples of sessile serrated lesion with dysplasia were included. Mutations in BRAF (exon 15; V600E) and KRAS (exon 2) were analyzed in serrated lesions and TAs using pyrosequencing. Finally, the authors compared BRAF mutations with immunohistochemical expression of VE1 antibodies against the BRAF V600E mutation, which was examined based on quantitative analyses and correlations between semiquantitative (0, 1+, or 2+) and quantitative results in colorectal serrated lesions. The cut-off value of VE1 expression (32%) was set based on receiver operating characteristic curve analysis. In the current study, mutations in BRAF were well correlated with VE1 expression in serrated lesions, although no TAs without BRAF mutations were immunopositive. In contrast, serrated lesions and TAs with mutations in KRAS were not stained for VE1 expression. In serrated lesions, although the sensitivity was 96.2% to 100%, the specificity was 90.0% to 100%. In addition, there was also good correlation between semiquantitative and quantitative results. Analysis of BRAF V600E expression may be pathologically useful, particularly in routine histopathologic diagnosis.

DOI： 10.1097/PAI.0000000000000890

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

BACKGROUND/AIM: Epigenetic alterations play an important role in the pathogenesis of gastrointestinal stromal tumors (GISTs). To obtain further insight into the GIST epigenome, we analyzed genome-wide histone modification and DNA methylation in GIST cells. MATERIALS AND METHODS: To reverse epigenetic silencing, GIST-T1 cells were treated with a DNA methyltransferase inhibitor and a histone deacetylase inhibitor, and subsequently H3K4me3 levels, the DNA methylome, and the transcriptome were analyzed. RESULTS: Treatment with epigenetic inhibitors not only up-regulated genes with DNA methylation, but also genes related to interferon signaling. ChIP-seq analysis revealed that drug treatment up-regulated H3K4me3 levels in retrotransposons, including endogenous retroviruses (ERV). Finally, utilizing the omics data, we found that hypermethylation of MEG3 is a frequent event and an indicator of poorer prognosis in GIST patients. CONCLUSION: Epigenetic inhibitors may activate interferon signaling via viral mimicry in GIST cells. Moreover, epigenome data could be a useful resource to identify novel GIST-related genes.

DOI： 10.21873/anticanres.15062

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

BACKGROUND: Small hepatocyte-like progenitor cells (SHPCs) appear to form transient clusters in rat livers treated with retrorsine (Ret) and 70% partial hepatectomy (PH). We previously reported that the expansion of SHPCs was amplified in Ret/PH-treated rat livers transplanted with Thy1+ cells derived from D-galactosamine-treated injured livers. Extracellular vesicles (EVs) produced by hepatic Thy1+ donor cells activated SHPCs via interleukin (IL)-17 receptor B signaling. As bone marrow-derived mesenchymal cells (BM-MCs) also express Thy1, we aimed to determine whether BM-MCs could also promote the growth of SHPCs. METHODS: BM-MCs were isolated from dipeptidyl-peptidase IV (DPPIV)-positive rats. BM-MCs or BM-MC-derived EVs were administered to DPPIV-negative Ret/PH rat livers, and the growth and the characteristics of SHPC clusters were evaluated 14 days post-treatment. miRNA microarrays and cytokine arrays examined soluble factors within EVs. Small hepatocytes (SHs) isolated from an adult rat liver were used to identify factors enhancing hepatocytic progenitor cells growth. RESULTS: The recipient's livers were enlarged at 2 weeks post-BM-MC transplantation. The number and the size of SHPCs increased remarkably in livers transplanted with BM-MCs. BM-MC-derived EVs also stimulated SHPC growth. Comprehensive analyses revealed that BM-MC-derived EVs contained miR-146a-5p, interleukin-6, and stem cell factor, which could enhance SHs' proliferation. Administration of EVs derived from the miR-146a-5p-transfected BM-MCs to Ret/PH rat livers remarkably enhanced the expansion of SHPCs. CONCLUSIONS: miR-146a-5p involved in EVs produced by BM-MCs may play a major role in accelerating liver regeneration by activating the intrinsic hepatocytic progenitor cells.

DOI： 10.1186/s13287-021-02387-6

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記述言語：英語  

DOI： 10.1111/pin.13078

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記述言語：日本語   出版者・発行元：(一社)日本大腸肛門病学会  

医中誌

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記述言語：日本語   出版者・発行元：(一社)日本大腸肛門病学会  

医中誌

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

The role of somatic copy number alterations (SCNAs) that occur in colorectal tumors is poorly understood. SCNAs are correlated with corresponding gene expression changes that may contribute to neoplastic progression. Thus, we examined SCNAs and the expression of messenger RNAs (mRNAs) located at corresponding loci in colorectal neoplasia, a progression model of human neoplasm. We used 42 colorectal neoplastic samples, including adenomas, intramucosal cancers (IMC) and invasive colorectal cancers (CRC) that were microsatellite stable (MSS) using a genome-wide SNP array and gene expression array (first cohort). In addition, validation analyses were examined (37 colorectal neoplasias). None of the mRNAs with a corresponding SCNA was found in the adenomas. However, three mRNAs, including ARFGEF2 at 20q13.13, N4BP2L2 at 13q13.1 and OLFM4 at 13q14.3 with a copy number (CN) gain at the corresponding locus were upregulated in IMCs of the first cohort. Moreover, upregulated expression of ARFGEF2 and OLFM4 was upregulated in the validation analysis. Finally, 28 mRNAs with gains of corresponding loci were pooled in invasive CRC of the first cohort. The mRNAs, including ACSS2 (20q11.22), DDX27 (20q13.13), MAPRE1 (20q11.21), OSBPL2 (20q11.22) and PHF20 (20q11.22-q11.23) with CN gains of the corresponding loci were identified in 28 mRNAs. Four of these mRNAs (DDX27, MAPRE1, OSBPL2 and PHF20) were upregulated in the invasive CRC in the validation analysis. We conclude that specific 13q and 22q CN gains with gene expression changes in the corresponding loci may play an important role in IMC cells' progression into invasive CRC.

DOI： 10.1002/gcc.22924

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

Epigenetic mechanisms such as histone modification play key roles in the pathogenesis of multiple myeloma (MM). We previously showed that EZH2, a histone H3 lysine 27 (H3K27) methyltransferase, and G9, a H3K9 methyltransferase, are potential therapeutic targets in MM. Moreover, recent studies suggest EZH2 and G9a cooperate to regulate gene expression. We therefore evaluated the antitumor effect of dual EZH2 and G9a inhibition in MM. A combination of an EZH2 inhibitor and a G9a inhibitor strongly suppressed MM cell proliferation in vitro by inducing cell cycle arrest and apoptosis. Dual EZH2/G9a inhibition also suppressed xenograft formation by MM cells in vivo. In datasets from the Gene Expression Omnibus, higher EZH2 and EHMT2 (encoding G9a) expression was significantly associated with poorer prognoses in MM patients. Microarray analysis revealed that EZH2/G9a inhibition significantly upregulated interferon (IFN)-stimulated genes and suppressed IRF4-MYC axis genes in MM cells. Notably, dual EZH2/G9a inhibition reduced H3K27/H3K9 methylation levels in MM cells and increased expression of endogenous retrovirus (ERV) genes, which suggests that activation of ERV genes may induce the IFN response. These results suggest that dual targeting of EZH2 and G9a may be an effective therapeutic strategy for MM.

DOI： 10.1038/s41420-020-00400-0

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記述言語：日本語   出版者・発行元：(株)医学書院  

医中誌

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

Gastric intraepithelial foveolar type neoplasia (IEFN) is not well defined. In addition, atrophic mucosa (AM) is an important issue to consider when evaluating gastric tumorigenesis. Here, we assessed the clinicopathological characteristics and molecular alterations contributing to the development of IEFN compared with intestinal type neoplasia. We examined the clinicopathological and molecular features of 42 cases of IEFN with low-grade dysplasia (LGD) and those of 77 cases of intraepithelial intestinal type neoplasia (IEIN) with LGD. The clinicopathological and molecular features examined included the AM status, mucin phenotype expression, CDX2 expression, p53 overexpression, β-catenin intranuclear accumulation, microsatellite instability (MSI), DNA methylation status (low methylation epigenotype [LME], intermediate ME, or high ME), allelic imbalances (AIs), and APC promoter 1B mutations. There were no differences in the frequencies of AM and rates of CDX2 expression between IEFN and IEIN cases. Although no differences in the frequencies of p53 overexpression and MSI were observed between the two histological types, intranuclear expression of β-catenin was significantly higher in IEIN than in IEFN. In addition, although the rate of LME was significantly higher in IEFN cases than in IEIN cases, IEFN was characterized by AIs at multiple foci. Finally, mutation of the APC promoter 1B, which is a characteristic of gastric adenocarcinoma and proximal polyposis of the stomach (potentially resembling IEFN), was detected in only one IEFN case. These findings suggested that IEFN may be an independent entity in terms of molecular alterations including the presence of multiple AIs and LME.

DOI： 10.1007/s00428-020-02846-0

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

The molecular mechanisms responsible for the progression of ovarian cancer remain incompletely understood. By targeting multiple cancer-related genes, microRNAs (miRNAs) have been identified as key regulators of cancer development and progression. In addition, the microenvironment, which constitutes cancer glands and the surrounding stromal tissue at the invasive front, has an important role in cancer progression. Using array-based analysis of 14 cases (cohort 1), the aim of the present study was to evaluate global miRNA expression in cancerous glands and surrounding stromal tissues (isolated using a crypt isolation method), in order to identify potential prognostic markers of high-grade serous carcinoma (HGSC). Reverse transcription-quantitative PCR was also used to verify the results in cohort 1 (14 cases) and in 16 additional HGSC cases (cohort 2; verification cohort). Firstly, miRNA expression levels were compared between HGSC and normal samples among both the isolated cancer gland and stromal tissue samples. Secondly, miRNA expression was compared between HGSC cases with recurrence and those without recurrence among the isolated cancer gland and stromal tissue samples. The results revealed six and seven miRNAs identified in both of the aforementioned comparisons in isolated cancer glands and surrounding stromal tissue, respectively. Furthermore, downregulation of miRNA-214-3p in isolated cancer glands and downregulation of miRNA-320c in the corresponding stromal tissue were associated with a decrease in disease-free survival (without recurrence) in cohort 2. These findings indicated that specific miRNAs expressed in cancer cells and surrounding stromal cells of HGSC may be potential biomarkers predicting patient prognosis.

DOI： 10.3892/ol.2020.12198

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1016/j.gie.2020.06.002

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記述言語：英語   出版者・発行元：日本電気泳動学会  

医中誌

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

The liver gradually loses its regenerative capabilities with aging. However, it remains unknown whether aging affects drug-induced liver injury. Here, we used acetaminophen induced acute liver injury model to compare tissue injury and regeneration of aged mice (>80 weeks old) with young ones (8-10 weeks old). The mortality of aged mice after acetaminophen injury was higher than that of young mice. Transient increase of serum GOT and decrease of reduced glutathione (GSH) were not returned to original levels in aged mice even at 48 hours. In addition, Foxm1b and its targets Ccnd1 and Cdk1 were upregulated in young but not in aged mice after 48 hours. Moreover, an apoptosis-related gene, Cidea, was upregulated specifically in aged livers, which was consistent with increased number of TUNEL+ hepatocytes. Unexpectedly, damaged hepatocytes were retained in aged liver tissue, which may be caused by impaired recruitment of macrophages to the damaged area, without increases in Ccl2 after acetaminophen injury. Collectively, prolonged oxidative stress due to delayed recovery of GSH and the retention of damaged hepatocytes may suppress tissue repair and hepatocyte proliferation, resulting in exacerbation of acetaminophen injury in aged mice. Thus, aging is a risk factor conferring susceptibility against drug-induced liver injury.

DOI： 10.18632/aging.103973

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記述言語：日本語   出版者・発行元：(一社)日本小児血液・がん学会  

医中誌

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記述言語：日本語   出版者・発行元：(一社)日本消化器内視鏡学会  

医中誌

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記述言語：日本語   出版者・発行元：(一社)日本消化器内視鏡学会  

医中誌

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記述言語：英語   出版者・発行元：(一社)日本癌学会  

医中誌

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記述言語：英語   出版者・発行元：(一社)日本癌学会  

医中誌

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記述言語：英語   出版者・発行元：(一社)日本癌学会  

医中誌

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記述言語：英語   出版者・発行元：(一社)日本癌学会  

医中誌

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記述言語：英語   出版者・発行元：(一社)日本癌学会  

医中誌

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記述言語：英語   出版者・発行元：(一社)日本癌学会  

医中誌

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

MicroRNAs (miRNAs) are potential biomarkers of neoplastic lesions, but additional information on dysregulated miRNA expression during progression of the adenoma-adenocarcinoma sequence may be helpful to identify the role of miRNAs in this sequence. We examined the expression levels of 13 miRNAs (hsa-miRNA-19a-3p, hsa-miRNA-21-5p, hsa-miRNA-27a-3p, hsa-miRNA-27b-3p, hsa-miRNA-31-5p, hsa-miRNA-34b-3p, hsa-miRNA-125b-5p, hsa-miRNA-143-3p, miRNA-191-5p, hsa-miRNA-193b-3p, hsa-miRNA-195-5p, hsa-miRNA-206 and hsa-let-7a-5p) that are closely associated with colorectal carcinogenesis in 40 conventional adenomas (tubular and tubulovillous adenomas), 20 intramucosal carcinomas (IMCs) and 60 invasive colorectal cancers (iCRCs) using reverse-transcription polymerase chain reaction. These 120 tumors were divided into two cohorts, that is, cohort 1 (60 cases) and cohort 2 (for validation; 60 cases). We analyzed the expression levels of these miRNAs in the first step (adenoma→IMC) and second step IMC→iCRC) of the adenoma-carcinoma sequence in both cohorts. Although no significant differences in the expression of any of the 13 miRNAs were found between adenomas and IMCs consistently in both cohorts, the expression levels of hsa-miRNA-125b-5p, hsa-miRNA-143-3p, and hsa-miRNA-206 were significantly upregulated in iCRC in both cohorts compared with those in IMC. The current results suggest that certain miRNAs, including hsa-miRNA-125b-5p, hsa-miRNA-143-3p and hsa-miRNA-206, are candidate markers that play critical roles in the progression of IMC to iCRC.

DOI： 10.1111/pin.12975

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

BACKGROUND: Recent studies have shown that traditional serrated adenoma (TSA) can be classified into BRAF and KRAS subtypes. Here, we examined the clinicopathological and molecular findings of 73 TSAs. MATERIALS AND METHODS: TSAs were subclassified into BRAF type (46 cases, type A) and KRAS type (27 cases, type B) and divided into polyp head (TSA component) and base (precursor component [PC]) to identify pathological and molecular differences between the two components. BRAF and KRAS mutations, microsatellite instability (MSI), and DNA methylation status of the TSA component and PC were analyzed. In addition, immunohistochemical expressions of annexin A10, MUC2, MUC5AC, MUC6, and CD10 were also examined. Finally, we compared endoscopic findings with histological features. RESULTS: We classified type As into 31 type A1s with mutation of the corresponding PC (42.5%) and 15 type A2s without mutation of the PC (20.5%). None of the corresponding PCs without KRAS mutation were observed in type Bs. MSI was not detected in the TSAs examined. There were significant differences in the frequency of annexin A10 and MUC5AC expression between the three subtypes. Furthermore, we compared the TSA component with the corresponding PC to identify the progression mechanism between the two components. Methylation status played an important role in the progression of type A1 from the corresponding PC, unlike type A2 and type B. Finally, specific endoscopic findings were well correlated with distinct histological findings. CONCLUSION: TSAs were heterogeneous tumors with two or three pathways to neoplastic progression.

DOI： 10.1007/s00535-020-01697-5

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

RATIONALE: Aggressive variant of splenic marginal zone lymphoma (AV-SMZL) is a very rare disease that is often associated with TP53 mutations and has a poor prognosis. On the other hand, recent advances in genome sequencing techniques enable us to understand the molecular characteristics of rare cancers such as AV-SMZL. Here we present a case of AV-SMZL analyzed using a genetic test. PATIENT CONCERNS: A 66-year-old woman was admitted with splenomegaly and lymphocytosis. Computed tomography revealed marked splenomegaly without lymphadenopathy in any other areas. The serum soluble interleukin-2 receptor (sIL-2R) level was significantly elevated. Peripheral and bone marrow blood tests showed an increase in abnormal lymphocytes. DIAGNOSIS: A splenectomy revealed an SMZL pattern with increased numbers of large cells and mitotic cells and a high Ki-67 positivity rate, which led to a diagnosis of AV-SMZL. Although TP53 mutation was not detected, mutations in NOTCH2, NCOA4, PTEN, EPHA3, and KMT2D were identified. Among these, the mutations in NCOA4, PTEN, and EPHA3 were novel pathogenic mutations in SMZL, which suggests they may be related to the aggressiveness and persistence of the disease. INTERVENTIONS: The patient was administered a rituximab-containing regimen and rituximab-maintenance therapy. OUTCOMES: The patient continues to exhibit a complete response. LESSONS: This is a case of AV-SMZL in which a cancer panel test successfully detected genetic alterations that are potentially associated with its pathogenesis. These findings suggest that genetic analysis is useful for making diagnoses as well as for determining treatment strategies in AV-SMZL.

DOI： 10.1097/MD.0000000000021938

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記述言語：日本語   出版者・発行元：(一社)日本消化器内視鏡学会  

医中誌

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記述言語：日本語   出版者・発行元：(一社)日本消化器内視鏡学会  

医中誌

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記述言語：日本語   出版者・発行元：(一社)日本消化器内視鏡学会  

医中誌

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記述言語：日本語   出版者・発行元：(一財)日本消化器病学会  

医中誌

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記述言語：日本語   出版者・発行元：(一財)日本消化器病学会  

医中誌

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記述言語：日本語   出版者・発行元：(一財)日本消化器病学会  

医中誌

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

Tumor angiogenesis is an important therapeutic target in colorectal cancer (CRC). We aimed to identify novel genes associated with angiogenesis in CRC. Using RNA sequencing analysis in normal and tumor endothelial cells (TECs) isolated from primary CRC tissues, we detected frequent upregulation of adipocyte enhancer-binding protein 1 (AEBP1) in TECs. Immunohistochemical analysis revealed that AEBP1 is upregulated in TECs and stromal cells in CRC tissues. Quantitative RT-PCR analysis showed that there is little or no AEBP1 expression in CRC cell lines, but that AEBP1 is well expressed in vascular endothelial cells. Levels of AEBP1 expression in Human umbilical vein endothelial cells (HUVECs) were upregulated by tumor conditioned medium derived from CRC cells or by direct coculture with CRC cells. Knockdown of AEBP1 suppressed proliferation, migration, and in vitro tube formation by HUVECs. In xenograft experiments, AEBP1 knockdown suppressed tumorigenesis and microvessel formation. Depletion of AEBP1 in HUVECs downregulated a series of genes associated with angiogenesis or endothelial function, including aquaporin 1 (AQP1) and periostin (POSTN), suggesting that AEBP1 might promote angiogenesis through regulation of those genes. These results suggest that upregulation of AEBP1 contributes to tumor angiogenesis in CRC, which makes AEBP1 a potentially useful therapeutic target.

DOI： 10.1111/cas.14360

PubMed

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記述言語：日本語   出版者・発行元：日本臨床分子医学会  

医中誌

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記述言語：日本語   出版者・発行元：日本消化器病学会-北海道支部  

医中誌

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Blackwell Publishing  

DOI： 10.1111/pin.12872

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記述言語：英語  

AIM: Most hepatoblastoma patients undergo pre/postoperative cisplatin treatment. Approximately 20% patients are cisplatin resistant, and show poor prognosis and high recurrence rates. However, some cisplatin-sensitive patients show early recurrence. We consider that a small population of cisplatin-resistant cells may remain after preoperative chemotherapy. Previous studies showed a correlation between DNA hypermethylation and hepatoblastoma progression. Here, we examined whether DNA hypermethylation was related to cisplatin resistance and could be a potential indicator for cisplatin as postoperative chemotherapy. METHODS: We extracted DNA from 43 resected hepatoblastoma tumors. Methylation array analyses were performed in 11 samples, including six cisplatin-sensitive and five cisplatin-resistant samples. We also performed cDNA microarray analysis in parental and cisplatin-resistant HuH6 cells. Through comparison of the datasets, we selected the strongest correlated cisplatin-resistant candidate gene. Using bisulfite pyrosequencing, the candidate gene methylation level was assessed in 38 cisplatin-sensitive patients after checking its usefulness as a substitute modality of methylation array. Correlations between the methylation status and clinical data were analyzed. RESULTS: CSF3R was the strongest correlated variable. Bisulfite pyrosequencing analysis also confirmed CSF3R was significantly hypermethylated in cisplatin-resistant patients. Among the 38 cisplatin-sensitive patients, recurrence curves showed that the CSF3R high methylation patients had significantly higher recurrence than CSF3R low methylation patients. The recurrence curve of methylation high patients was similar to that of cisplatin-resistant patients. CONCLUSIONS: Our findings suggested that CSF3R hypermethylation was related to cisplatin resistance in HB patients and could be a predictor of postoperative chemotherapy, and indicate that CSF3R high methylation patients should be treated with non-CDDP regimens.

DOI： 10.1111/hepr.13479

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記述言語：日本語   出版者・発行元：(一社)日本消化管学会  

医中誌

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記述言語：日本語   出版者・発行元：医歯薬出版(株)  

その他リンク： https://search.jamas.or.jp/index.php?module=Default&action=Link&pub_year=2020&ichushi_jid=J00060&link_issn=&doc_id=20200106020001&doc_link_id=%2Faa7ayuma%2F2020%2F027201%2F002%2F0004b0009%26dl%3D3&url=http%3A%2F%2Fwww.medicalonline.jp%2Fjamas.php%3FGoodsID%3D%2Faa7ayuma%2F2020%2F027201%2F002%2F0004b0009%26dl%3D3&type=MedicalOnline&icon=https%3A%2F%2Fjk04.jamas.or.jp%2Ficon%2F00004_4.gif

医中誌

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

In this study, we investigated how the ability of hepatocytic parental progenitor cells (HPPCs) to self-renew can be maintained and how laminin (LN) isoforms play an important role in their self-renewal and maturation. Hepatocytes isolated from adult rat livers were cultured on hyaluronic acid to form colonies consisting of CD44+ small hepatocytes, which could be passaged on dishes coated with Matrigel. When second-passage cells were plated on Matrigel, LN111, or LN511, HPPCs appeared on Matrigel and LN111 but not on LN511. We identified two types of cells among the second-passage cells: Small, round cells and large, flat ones were observed on Matrigel, whereas the former and latter ones were specifically attached on LN111 and LN511, respectively. We hypothesized that small and round cells are the origin of HPPC colonies, and the binding to LN111 could be key to maintaining their self-renewal capability. Among the integrins involved in LN binding, integrins α3 and β1 were expressed in colonies on LN111 more than in those on LN511, whereas β4 was more strongly expressed in colonies on LN511. Integrin α3highα6β1high cells could form HPPC colonies on LN111 but not on LN511, whereas integrin α6β1low cells could not on either LN111 or LN511. In addition, neutralizing anti-integrin β1 and anti-LN111 antibodies inhibited the passaged cells' ability to attach and form colonies on LN111 by HPPCs. Matrigel overlay induced second-passage cells growing on LN111 to increase their expression of hepatic functional genes and to form 3-dimensional colonies with bile canalicular networks, whereas such a shift was poorly induced when they were grown onLN511. Conclusion: These results suggest that the self-renewal capability of HPPCs depends on LN111 through integrin β1 signaling.

DOI： 10.1002/hep4.1442

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

Recent studies have shown that colorectal serrated lesions, which include sessile serrated adenomas (SSAs) and traditional serrated adenomas (TSAs), are precursors of colorectal cancer. However, the molecular mechanisms underlying the carcinogenesis, particularly in TSAs, remain largely uncharacterized. To clarify their molecular and clinicopathological characteristics, we performed mutation and methylation analyses of cancer-associated genes in 78 serrated lesions, including TSAs, SSAs and microvesicular hyperplastic polyps. Target exon sequence analysis was performed with 39 genes, including genes known to be frequently mutated in colorectal cancers and/or serrated lesions. We also used bisulfite pyrosequencing to assess the methylation status of various cancer-associated genes and marker genes of the CpG island methylator phenotype (CIMP). The prevalence of mutations in genes associated with Wnt signaling was significantly higher in TSAs than SSAs (65% vs. 28%, p < 0.01). Among those, RNF43 mutations were observed in 38% of TSAs and 17% of SSAs. In immunohistochemical studies of 39 serrated lesions, the prevalence of abnormal nuclear β-catenin accumulation was significantly higher in TSAs (57%) than SSAs (8%) (P = 0.01). SMOC1 methylation was detected in 54% of TSAs but in no SSAs (p < 0.01). Additionally, SMOC1 methylation was more prevalent among TSAs with KRAS mutation (82%) than with BRAF mutation (38%, p = 0.03). Lesions with CIMP-high or RNF43 mutations were detected only in TSAs with BRAF mutation, suggesting two distinct carcinogenic pathways in TSAs. Mutations in genes associated with Wnt signaling play a greater role in the carcinogenesis of TSAs than SSAs.

DOI： 10.1371/journal.pone.0229262

PubMed

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記述言語：英語   出版者・発行元：札幌医科大学  

その他リンク： https://search.jamas.or.jp/index.php?module=Default&action=Link&pub_year=2019&ichushi_jid=J00522&link_issn=&doc_id=20200421320004&doc_link_id=http%3A%2F%2Fid.nii.ac.jp%2F1599%2F00016489%2F&url=http%3A%2F%2Fid.nii.ac.jp%2F1599%2F00016489%2F&type=%8ED%96y%88%E3%89%C8%91%E5%8Aw%81F%8ED%96y%88%E3%89%C8%91%E5%8Aw%8Aw%8Fp%8B%40%8A%D6%83%8A%83%7C%83W%83g%83%8A_ikor&icon=https%3A%2F%2Fjk04.jamas.or.jp%2Ficon%2F80183_3.gif

医中誌

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記述言語：英語  

Based on the concept of the adenoma-carcinoma sequence, most colorectal cancers are considered to arise from conventional adenomas. However, recent studies suggested that a subset of colorectal cancers develop through the serrated neoplastic pathway. It has also been documented that serrated polyps can rapidly transform into invasive cancers even when they are small in size. We now describe a case of a sessile serrated adenoma/polyp which had been followed up for 4 years but eventually showed rapid transformation into an advanced cancer accompanied by a remarkable morphological change within only 13 months. Retrospective genetic and epigenetic analyses showed microsatellite instability, CpG island methylator phenotype-positive, and BRAF mutation in the lesion, suggesting the tumor had developed through the serrated neoplastic pathway. This case may provide valuable information about the natural history of sessile serrated adenoma/polyps which eventually progress to advanced cancers.

DOI： 10.1111/den.13572

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記述言語：英語   出版者・発行元：日本癌学会  

医中誌

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記述言語：英語   出版者・発行元：(一社)日本癌学会  

医中誌

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記述言語：英語   出版者・発行元：日本癌学会  

医中誌

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記述言語：英語   出版者・発行元：日本癌学会  

医中誌

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記述言語：英語   出版者・発行元：日本癌学会  

医中誌

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記述言語：英語   出版者・発行元：日本癌学会  

医中誌

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記述言語：英語  

BACKGROUND: Ubiquitin-like protein containing PHD and RING finger domains 1 (UHRF1) is a major regulator of epigenetic mechanisms and is overexpressed in various human malignancies. In this study, we examined the involvement of UHRF1 in aberrant DNA methylation and gene silencing in colorectal cancer (CRC). RESULTS: CRC cell lines were transiently transfected with siRNAs targeting UHRF1, after which DNA methylation was analyzed using dot blots, bisulfite pyrosequencing, and Infinium HumanMethylation450 BeadChip assays. Gene expression was analyzed using RT-PCR and gene expression microarrays. Depletion of UHRF1 rapidly induced genome-wide DNA demethylation in CRC cells. Infinium BeadChip assays and bisulfite pyrosequencing revealed significant demethylation across entire genomic regions, including CpG islands, gene bodies, intergenic regions, and repetitive elements. Despite the substantial demethylation, however, UHRF1 depletion only minimally reversed CpG island hypermethylation-associated gene silencing. By contrast, the combination of UHRF1 depletion and histone deacetylase (HDAC) inhibition reactivated the silenced genes and strongly suppressed CRC cell proliferation. The combination of UHRF1 depletion and HDAC inhibition also induced marked changes in the gene expression profiles such that cell cycle-related genes were strikingly downregulated. CONCLUSIONS: Our results suggest that (i) maintenance of DNA methylation in CRC cells is highly dependent on UHRF1; (ii) UHRF1 depletion rapidly induces DNA demethylation, though it is insufficient to fully reactivate the silenced genes; and (iii) dual targeting of UHRF1 and HDAC may be an effective new therapeutic strategy.

DOI： 10.1186/s13148-019-0668-3

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1097/MPA.0000000000001199

PubMed

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

Epigenetic alterations play an important role in the pathogenesis in multiple myeloma, but their biological and clinical relevance is not fully understood. Here, we show that DOT1L, which catalyzes methylation of histone H3 lysine 79, is required for myeloma cell survival. DOT1L expression levels were higher in monoclonal gammopathy of undetermined significance and smoldering multiple myeloma than in normal plasma cells. Treatment with a DOT1L inhibitor induced cell cycle arrest and apoptosis in myeloma cells, and strongly suppressed cell proliferation in vitro The anti-myeloma effect of DOT1L inhibition was confirmed in a mouse xenograft model. Chromatin immunoprecipitation-sequencing and microarray analysis revealed that DOT1L inhibition downregulated histone H3 lysine 79 dimethylation and expression of IRF4-MYC signaling genes in myeloma cells. In addition, DOT1L inhibition upregulated genes associated with immune responses and interferon signaling. Myeloma cells with histone modifier mutations or lower IRF4/MYC expression were less sensitive to DOT1L inhibition, but with prolonged treatment, anti-proliferative effects were achieved in these cells. Our data suggest that DOT1L plays an essential role in the development of multiple myeloma and that DOT1L inhibition may provide new therapies for myeloma treatment.

DOI： 10.3324/haematol.2018.191262

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DOI： 10.1159/000494410

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記述言語：日本語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Japanese Society of Gastroenterology  

DOI： 10.11405/nisshoshi.116.859

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

BACKGROUND: Recent studies revealed that colorectal tumors are composed of genetically diverse subclones. We aimed to clarify whether the surface microstructures of colorectal tumors are associated with genetic intratumoral heterogeneity (ITH). METHODS: The surface microstructures (pit patterns) of colorectal tumors were observed using magnifying endoscopy, and biopsy specimens were obtained from respective areas when tumors exhibited multiple pit patterns. A total of 711 specimens from 477 colorectal tumors were analyzed for BRAF, KRAS and TP53 mutations using pyrosequencing and direct sequencing. A panel of cancer-related genes was analyzed through targeted sequencing in 7 tumors. RESULTS: Colorectal tumors with multiple pit patterns exhibited more advanced pit patterns and higher frequencies of KRAS and/or TP53 mutations than tumors with a single pit pattern. In tumors with multiple pit patterns, mutations were observed as public (common to all areas) or private (specific to certain areas), and private KRAS and/or TP53 mutations were often variable and unrelated to the pit pattern grade. Notably, invasive CRCs frequently exhibited public TP53 mutations, even in adenomatous areas, which is indicative of their early malignant potential. Targeted sequencing revealed additional public and private mutations in tumors with multiple pit patterns, indicating their single clonal origin. CONCLUSIONS: Our results suggest intratumoral pit pattern variation does not simply reflect the process of colorectal tumor evolution, but instead represents genetically diverse subclones, and this diversity may be associated with malignant potential.

DOI： 10.1007/s00535-018-1481-z

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

Hepatitis B virus (HBV) infection is a major cause of hepatocellular carcinoma (HCC). Nucleos(t)ide analogue (NA) therapy effectively reduces the incidence of HCC, but it does not completely prevent the disease. Here, we show that dysregulation of microRNAs (miRNAs) is involved in post-NA HCC development. We divided chronic hepatitis B (CHB) patients who received NA therapy into two groups: 1) those who did not develop HCC during the follow-up period after NA therapy (no-HCC group) and 2) those who did (HCC group). miRNA expression profiles were significantly altered in CHB tissues as compared to normal liver, and the HCC group showed greater alteration than the no-HCC group. NA treatment restored the miRNA expression profiles to near-normal in the no-HCC group, but it was less effective in the HCC group. A number of miRNAs implicated in HCC, including miR-101, miR-140, miR-152, miR-199a-3p, and let-7g, were downregulated in CHB. Moreover, we identified CDK7 and TACC2 as novel target genes of miR-199a-3p. Our results suggest that altered miRNA expression in CHB contributes to HCC development, and that improvement of miRNA expression after NA treatment is associated with reduced HCC risk.

DOI： 10.1016/j.canlet.2018.07.019

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1007/s10620-018-5167-4

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

Bile duct cancer is a highly aggressive malignancy wherein early diagnosis is difficult and few treatment options are available. MicroRNA-31 (miR-31) is reported to be related with survival in patients with gastrointestinal cancers; however, the regulatory mechanism of miR-31 and association between miR-31 expression and survival in patients with bile duct cancer cases have not been established. Thus, we evaluated miR-31 expression in bile duct cancer tissues and assessed its relationship with prognosis. Additionally, we examined the effects of several cytokines on miR-31 expression. The study included 81 samples of bile duct cancer tissues. MiR-31 expression in bile duct cancer cells was significantly higher than that in normal bile duct epithelial cells (P = 0.038). There were no significant associations between miR-31 expression and clinical or pathological characteristics, except for tumour size (P = 0.012). In Kaplan-Meier analysis, high miR-31 expression was significantly associated with shorter survival (log-rank test, P = 0.0082). In multivariate Cox regression analysis, high miR-31 expression was significantly associated with prognosis (P = 0.043), independent of clinical or pathological features. Interleukin-6 (IL-6) significantly promoted miR-31 expression and cell proliferation in a dose-dependent manner, and the inhibition of STAT-3 signalling significantly suppressed miR-31 expression and cell proliferation. In conclusion, high expression was significantly associated with poor prognosis in bile duct cancer patients. The IL-6-STAT-3 signalling regulated bile duct cancer cell proliferation and miR-31 expression. Our findings suggest that miR-31 may be a promising biomarker that reflects IL-6 expression in bile duct cancer tissues and predicts poor prognosis.

DOI： 10.1093/carcin/bgy075

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記述言語：英語   出版者・発行元：日本癌学会  

医中誌

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記述言語：英語   出版者・発行元：日本癌学会  

医中誌

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記述言語：英語   出版者・発行元：日本癌学会  

医中誌

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記述言語：英語   出版者・発行元：(一社)日本癌学会  

医中誌

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記述言語：英語   出版者・発行元：日本癌学会  

医中誌

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記述言語：英語   出版者・発行元：(一社)日本癌学会  

医中誌

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記述言語：英語   出版者・発行元：(一社)日本癌学会  

医中誌

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記述言語：英語   出版者・発行元：日本癌学会  

医中誌

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記述言語：英語   出版者・発行元：(一社)日本癌学会  

医中誌

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

Recent studies have shown that long noncoding RNAs (lncRNAs) have pivotal roles in human malignancies, although their significance in oral squamous cell carcinoma (OSCC) is not fully understood. In the present study, we identified lncRNAs functionally associated with OSCC. By analyzing RNA-seq datasets obtained from primary head and neck squamous cell carcinoma (HNSCC), we identified 15 lncRNAs aberrantly expressed in cancer tissues. We then validated their expression in 18 OSCC cell lines using qRT-PCR and identified 6 lncRNAs frequently overexpressed in OSCC. Among those, we found that knocking down DLEU1 (deleted in lymphocytic leukemia 1) strongly suppressed OSCC cell proliferation. DLEU1 knockdown also suppressed migration, invasion, and xenograft formation by OSCC cells, which is suggestive of its oncogenic functionality. Microarray analysis revealed that DLEU1 knockdown significantly affects expression of a number of cancer-related genes in OSCC cells, including HAS3, CD44, and TP63, suggesting that DLEU1 regulates HA-CD44 signaling. Expression of DLEU1 was elevated in 71% of primary OSCC tissues, and high DLEU1 expression was associated with shorter overall survival of HNSCC patients. These data suggest that elevated DLEU1 expression contributes to OSCC development, and that DLEU1 may be a useful therapeutic target in OSCC.

DOI： 10.1038/s41419-018-0893-2

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

BACKGROUND: Colorectal serrated lesions (SLs) are important premalignant lesions whose clinical and biological features are not fully understood. AIMS: We aimed to establish accurate colonoscopic diagnosis and treatment of SLs through evaluation of associations among the morphological, pathological, and molecular characteristics of SLs. METHODS: A total of 388 premalignant and 18 malignant colorectal lesions were studied. Using magnifying colonoscopy, microsurface structures were assessed based on Kudo's pit pattern classification system, and the Type II pit pattern was subcategorized into classical Type II, Type II-Open (Type II-O) and Type II-Long (Type II-L). BRAF/KRAS mutations and DNA methylation of CpG island methylator phenotype (CIMP) markers (MINT1, - 2, - 12, - 31, p16, and MLH1) were analyzed through pyrosequencing. RESULTS: Type II-O was tightly associated with sessile serrated adenoma/polyps (SSA/Ps) with BRAF mutation and CIMP-high. Most lesions with simple Type II or Type II-L were hyperplastic polyps, while mixtures of Type II or Type II-L plus more advanced pit patterns (III/IV) were characteristic of traditional serrated adenomas (TSAs). Type II-positive TSAs frequently exhibited BRAF mutation and CIMP-low, while Type II-L-positive TSAs were tightly associated with KRAS mutation and CIMP-low. Analysis of lesions containing both premalignant and cancerous components suggested Type II-L-positive TSAs may develop into KRAS-mutated/CIMP-low/microsatellite stable cancers, while Type II-O-positive SSA/Ps develop into BRAF-mutated/CIMP-high/microsatellite unstable cancers. CONCLUSIONS: These results suggest that Type II subtypes reflect distinct molecular subclasses in the serrated neoplasia pathway and that they could be useful hallmarks for identifying SLs at high risk of developing into CRC.

DOI： 10.1007/s10620-018-5016-5

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Academic Press  

DOI： 10.1016/j.yjmcc.2018.05.003

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

In this study, we identified microRNAs (miRNAs) involved in cisplatin (CDDP) resistance in bladder cancer (BCa). After establishing CDDP-resistant BCa cell lines (T24RC and EJ138RC), TaqMan arrays revealed that members of the miR-200 family (miR-200b, miR-200a and miR-429) were downregulated in T24RC as compared to parental T24 cells. miR-200b was associated with CDDP sensitivity in BCa cells, and its downregulation was associated with CpG island hypermethylation. Pharmacological demethylation using 5-aza-2'-deoxycytidine restored miR-200b expression, and the combination of 5-aza-2'-deoxycytidine + CDDP strongly inhibited T24RC cell proliferation. Microarray analysis revealed that miR-200b + CDDP induced genes involved in CDDP sensitivity or cytotoxicity, including IGFBP3, ICAM1 and TNFSF10, in the resistant cells. Expression and DNA methylation of miR-200b were inversely associated in primary BCa, and low expression/high methylation was associated with poor overall survival. These results suggest downregulation of miR-200b is associated with CDDP resistance in BCa. Epigenetic silencing of miR-200b may be a marker of CDDP resistance and a useful therapeutic target for overcoming CDDP resistance in BCa.

DOI： 10.18632/oncotarget.25326

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Impact Journals LLC  

DOI： 10.18632/oncotarget.25112

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

Triple-negative breast cancer (TNBC), defined as breast cancer lacking estrogen- and progesterone‑receptor expression and human epidermal growth factor receptor 2 (HER2) amplification, is a heterogeneous disease. RNA-sequencing analysis of 15 TNBC specimens and The Cancer Genome Atlas-TNBC dataset analysis identified the frequent downregulation of leucine-rich repeat-containing 26 (LRRC26), which negatively regulates nuclear factor-κB (NF-κB) signaling, in TNBC tissues. Quantitative polymerase chain reaction and bisulfite pyrosequencing analyses revealed that LRRC26 was frequently silenced in TNBC tissues and cell lines as a result of promoter methylation. LRRC26 expression was restored by 5-aza-2'-deoxycytidine (5'-aza-dC) treatment in HCC1937 TNBC cells, which lack LRRC26 expression. Notably, small interfering RNA-mediated knockdown of LRRC26 expression significantly enhanced the anchorage-independent growth, invasion and migration of HCC70 cells, whereas ectopic overexpression of LRRC26 in BT20 cells suppressed their invasion and migration. Conversely, neither knockdown nor overexpression of LRRC26 had an effect on cell viability in the absence of tumor necrosis factor-α (TNF-α) stimulation. Meanwhile, overexpression of LRRC26 caused the reduction of TNF-α-mediated NF-κB luciferase reporter activity, whereas depleting LRRC26 expression resulted in the upregulation of TNF-α-mediated NF-κB downstream genes [interleukin-6 (IL-6), IL-8 and C-X-C motif chemokine ligand-1]. Taken together, these findings demonstrate that LRRC26 is frequently downregulated in TNBC due to DNA methylation and that it suppresses the TNF-α-independent anchorage-independent growth, invasion and migration of TNBC cells. Loss of LRRC26 function may be a critical event in the aggressiveness of TNBC cells through a TNF-α/NF-κB-independent mechanism.

DOI： 10.3892/ijo.2018.4301

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

Triple-negative breast cancer (TNBC), defined as breast cancer lacking estrogen- and progesterone?receptor expression and human epidermal growth factor receptor 2 (HER2) amplification, is a heterogeneous disease. RNA-sequencing analysis of 15 TNBC specimens and The Cancer Genome Atlas-TNBC dataset analysis identified the frequent downregulation of leucine-rich repeat-containing 26 (LRRC26), which negatively regulates nuclear factor-κB (NF-κB) signaling, in TNBC tissues. Quantitative polymerase chain reaction and bisulfite pyrosequencing analyses revealed that LRRC26 was frequently silenced in TNBC tissues and cell lines as a result of promoter methylation. LRRC26 expression was restored by 5-aza-2&#039;-deoxycytidine (5&#039;-aza-dC) treatment in HCC1937 TNBC cells, which lack LRRC26 expression. Notably, small interfering RNA-mediated knockdown of LRRC26 expression significantly enhanced the anchorage-independent growth, invasion and migration of HCC70 cells, whereas ectopic overexpression of LRRC26 in BT20 cells suppressed their invasion and migration. Conversely, neither knockdown nor overexpression of LRRC26 had an effect on cell viability in the absence of tumor necrosis factor-α (TNF-α) stimulation. Meanwhile, overexpression of LRRC26 caused the reduction of TNF-α-mediated NF-κB luciferase reporter activity, whereas depleting LRRC26 expression resulted in the upregulation of TNF-α-mediated NF-κB downstream genes [interleukin-6 (IL-6), IL-8 and C-X-C motif chemokine ligand-1]. Taken together, these findings demonstrate that LRRC26 is frequently downregulated in TNBC due to DNA methylation and that it suppresses the TNF-α-independent anchorage-independent growth, invasion and migration of TNBC cells. Loss of LRRC26 function may be a critical event in the aggressiveness of TNBC cells through a TNF-α/NF-κB-independent mechanism.

DOI： 10.3892/ijo.2018.4301

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Elsevier Inc.  

DOI： 10.1016/j.urology.2017.11.025

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：John Wiley and Sons Inc.  

DOI： 10.1002/mc.22769

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Springer Tokyo  

DOI： 10.1007/s10120-018-0810-5

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

Colorectal sessile serrated adenoma/polyps (SSA/Ps) are well-known precursors of colorectal cancer (CRC) characterized by BRAF mutation and microsatellite instability. By contrast, the molecular characteristics of traditional serrated adenoma (TSAs) are not fully understood. We analyzed genome-wide DNA methylation in TSAs having both protruding and flat components. We identified 11 genes, including SMOC1, methylation of which progressively increased during the development of TSAs. SMOC1 was prevalently methylated in TSAs, but was rarely methylated in SSA/Ps (p < 0.001). RT-PCR and immunohistochemistry revealed that SMOC1 was expressed in normal colon and SSA/Ps, but its expression was decreased in TSAs. Ectopic expression of SMOC1 suppressed proliferation, colony formation and in vivo tumor formation by CRC cells. Analysis of colorectal lesions (n = 847) revealed that SMOC1 is frequently methylated in TSAs, high-grade adenomas and CRCs. Among these, SMOC1 methylation was strongly associated with KRAS mutation and CpG island methylator phenotype (CIMP)-low. These results demonstrate that epigenetic silencing of SMOC1 is associated with TSA development but is rarely observed in SSA/Ps. SMOC1 expression could thus be a diagnostic marker of serrated lesions, and SMOC1 methylation could play a role in neoplastic pathways in TSAs and conventional adenomas.

DOI： 10.18632/oncotarget.23523

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記述言語：英語   出版者・発行元：AME Publishing Company  

DOI： 10.21037/tgh.2018.01.02

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

Objective: Recent studies have shown that cancer-associated fibroblasts (CAFs) and the epithelial-mesenchymal transition (EMT) play important roles in the progression and metastasis of CRC. Although prediction of lymph node metastasis in submucosal invasive colorectal cancer (SiCRC) is important, the relationships of CAF and EMT with lymph node metastasis of SiCRC have not yet been examined. Here, we aimed to analyze the expression patterns of CAF- and EMT-related proteins in SiCRC. Materials and Methods: The expression of CAF-related markers, including α-smooth muscle actin, CD10, podoplanin, fibroblast specific protein 1, and adipocyte enhancer-binding protein 1, and EMT-related proteins [zinc finger protein SNAI2 (ZEB1) and twist-related protein 1 (TWIST1) in SiCRC with (n = 29) or without (n = 80) lymph node metastasis was examined by immunohistochemistry. We examined the expression patterns of biomarkers using hierarchical cluster analysis. Consequently, four subgroups were established based on the expression patterns of CAF- and EMT-related markers, and the associations of these subgroups with clinicopathological variables. Results: In multivariate analysis, subgroup 2, which was characterized by high expression of all markers, was correlated with lymph node metastasis (p < 0.01). Next, we examined the associations of individual biomarkers with lymph node metastasis. Multivariate analysis showed that moderately differentiated adenocarcinoma was significantly associated with lymph node metastasis (p < 0.05). Conclusions: Our findings showed that expression patterns of CAF markers and EMT-related proteins may allow for stratification of patients into risk categories for lymph node metastasis in SiCRC.

DOI： 10.7150/jca.25646

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記述言語：英語  

The tumor suppressor p53 and its family members, p63 and p73, play a pivotal role in the cell fate determination in response to diverse upstream signals. As transcription factors, p53 family proteins regulate a number of genes that are involved in cell cycle arrest, apoptosis, senescence, and maintenance of genomic stability. Recent studies revealed that p53 family proteins are important for the regulation of cell invasion and migration. Microarray analysis showed that breast cancer metastasis suppressor 1-like (BRMS1L) is upregulated by p53 family proteins, specifically p53, TAp63γ, and TAp73β. We identified two responsive elements of p53 family proteins in the first intron and upstream of BRMS1L. These response elements are well conserved among mammals. Functional analysis showed that ectopic expression of BRMS1L inhibited cancer cell invasion and migration; knockdown of BRMS1L by siRNA induced the opposite effect. Importantly, clinical databases revealed that reduced BRMS1L expression correlated with poor prognosis in patients with breast and brain cancer. Together, these results strongly indicate that BRMS1L is one of the mediators downstream of the p53 pathway, and that it inhibits cancer cell invasion and migration, which are essential steps in cancer metastasis. Collectively, our results indicate that BRMS1L is involved in cancer cell invasion and migration, and could be a therapeutic target for cancer.

DOI： 10.1111/cas.13420

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記述言語：英語   出版者・発行元：生命科学系学会合同年次大会運営事務局  

医中誌

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

その他リンク： http://orcid.org/0000-0002-8507-1726

DOI： 10.1111/cas.13420

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1016/j.gie.2017.05.006

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1007/s00535-017-1317-2

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.3892/ol.2017.6911

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1111/pin.12598

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記述言語：英語   出版者・発行元：日本癌学会  

医中誌

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記述言語：英語   出版者・発行元：(一社)日本癌学会  

医中誌

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記述言語：英語   出版者・発行元：(一社)日本癌学会  

医中誌

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1002/mc.22631

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1007/s00535-016-1269-y

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Springer Verlag  

DOI： 10.1186/s13148-017-0352-4

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1186/s13148-017-0352-4

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1038/srep46177

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Blackwell Publishing Ltd  

DOI： 10.1111/cas.13164

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1111/cas.13164

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1007/s10120-016-0616-2

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1002/mc.22514

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記述言語：英語   掲載種別：論文集(書籍)内論文   出版者・発行元：Humana Press Inc.  

DOI： 10.1007/978-3-319-59786-7_17

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1371/journal.pone.0168281

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1002/ijc.30377

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記述言語：英語   出版者・発行元：(一社)日本癌学会  

医中誌

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記述言語：英語   出版者・発行元：(一社)日本癌学会  

医中誌

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.18632/oncotarget.10972

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.18632/oncotarget.10571

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.18632/oncotarget.9044

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1111/cas.12928

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1038/srep26699

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1002/ijc.29916

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記述言語：日本語   出版者・発行元：日本臨床分子医学会  

医中誌

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1007/978-981-10-1498-7_4

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記述言語：日本語   出版者・発行元：(株)医学書院  

医中誌

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.18632/oncotarget.5034

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記述言語：英語   出版者・発行元：(一社)日本癌学会  

医中誌

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記述言語：英語   出版者・発行元：日本癌学会  

医中誌

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1016/j.ab.2015.05.003

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.18632/oncotarget.4294

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1371/journal.pone.0137801

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1007/s00535-015-1049-0

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1002/ijc.29488

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1158/1538-7445.AM2015-1054

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1245/s10434-014-4264-7

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1158/1940-6207.CAPR-14-0306

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1371/journal.pone.0133754

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1016/j.celrep.2015.05.011

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1111/pin.12274

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記述言語：日本語   掲載種別：研究論文（学術雑誌）  

DOI： 10.11405/nisshoshi.112.676

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.18632/oncotarget.3109

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1159/000368820

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その他リンク： http://orcid.org/0000-0003-1244-4488

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記述言語：英語  

DOI： 10.1016/j.bbrc.2014.07.007

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1002/ijc.28920

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1158/0008-5472.CAN-14-1140

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1158/1940-6207.CAPR-14-0162

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1111/cas.12498

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記述言語：英語   出版者・発行元：(一社)日本癌学会  

医中誌

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.3748/wjg.v20.i34.12346

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.18632/oncotarget.2272

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記述言語：英語   出版者・発行元：(一社)日本癌学会  

医中誌

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.3748/wjg.v20.i29.10050

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DOI： 10.3390/proteomes2030323

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1007/s00535-013-0861-7

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1093/hmg/ddt673

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.3748/wjg.v20.i14.3927

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1093/carcin/bgt374

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1002/stem.1594

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1158/0008-5472.CAN-13-1865

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1007/s13277-013-1131-2

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1053/j.gastro.2013.10.060

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記述言語：英語   掲載種別：論文集(書籍)内論文   出版者・発行元：Springer New York  

DOI： 10.1007/978-1-4899-8065-6_11

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記述言語：英語  

DOI： 10.1159/000356201

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1158/1541-7786.MCR-13-0330-T

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1007/s00383-013-3371-z

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記述言語：英語   出版者・発行元：(一社)日本癌学会  

医中誌

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記述言語：英語   出版者・発行元：(一社)日本癌学会  

医中誌

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記述言語：英語   出版者・発行元：(一社)日本癌学会  

医中誌

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1016/j.eururo.2012.11.030

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1002/ijc.27856

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1016/j.yexmp.2012.10.004

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

Pancreatoblastoma is a rare pancreatic tumor that is most commonly encountered in infants and young children. This report describes an unusual presentation of a large pancreatic body pancreatoblastoma presenting with intraabdominal bleeding due to spontaneous rupture of the tumor in a 5-year-old boy. Subsequent molecular analysis from the resected specimen identified a mutation in CTNNB1 and aberrant methylation of the tumor suppressor RASSF1A.

DOI： 10.1016/j.jpedsurg.2013.02.038

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.3748/wjg.v19.i11.1718

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1002/gcc.22013

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記述言語：日本語   出版者・発行元：日本分子腫瘍マーカー研究会  

その他リンク： http://search.jamas.or.jp/link/ui/2014226313

DOI： 10.11241/jsmtmr.28.62

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記述言語：日本語   出版者・発行元：日本分子腫瘍マーカー研究会  

その他リンク： http://search.jamas.or.jp/link/ui/2014226308

DOI： 10.11241/jsmtmr.28.53

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記述言語：英語  

DOI： 10.3389/fgene.2013.00258

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Springer-Verlag Tokyo  

DOI： 10.1007/s12328-013-0376-z

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Impact Journals LLC  

DOI： 10.18632/oncotarget.1324

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1186/gm402

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.3748/wjg.v18.i45.6577

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記述言語：英語  

DOI： 10.1016/j.molonc.2012.07.007

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.4161/cbt.22280

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記述言語：英語  

DOI： 10.1111/j.1349-7006.2012.02384.x

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記述言語：英語  

DOI： 10.5483/BMBRep.2012.45.11.227

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1016/j.ajpath.2012.08.007

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1158/1940-6207.CAPR-12-0056

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1007/s13277-012-0378-3

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記述言語：日本語   出版者・発行元：(一財)日本消化器病学会  

医中誌

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記述言語：日本語   出版者・発行元：日本分子腫瘍マーカー研究会  

医中誌

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記述言語：英語   出版者・発行元：(一社)日本癌学会  

医中誌

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記述言語：英語   出版者・発行元：(一社)日本癌学会  

医中誌

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.3899/jrheum.111609

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.3748/wjg.v18.i22.2745

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記述言語：日本語   出版者・発行元：日本臨床分子医学会  

医中誌

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1007/s13277-011-0278-y

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記述言語：英語  

DOI： 10.1007/s13277-011-0308-9

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1007/s13277-011-0302-2

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1074/jbc.M111.321828

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1038/ajg.2011.457

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1158/0008-5472.CAN-11-1803

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記述言語：日本語   出版者・発行元：(株)先端医学社  

医中誌

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1136/gut.2011.241034

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1111/j.1349-7006.2011.02138.x

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1111/j.1349-7006.2011.02138.x

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掲載種別：研究論文（学術雑誌）  

BACKGROUND AND AIMS:The majority of gastrointestinal stromal tumors (GISTs) have KIT mutations; however, epigenetic abnormalities that could conceivably potentiate the aggressiveness of GISTs are largely unidentified. Our aim was to establish epigenetic profiles associated with the malignant transformation of GISTs.;METHODS:Methylation of four tumor suppressor genes, RASSF1A, p16, CDH1, and MGMT was analyzed in GISTs. Additionally, genome-wide DNA methylation profiles were compared between small, malignant-prone, and malignant GISTs using methylated GpG island amplification microarrays (MCAM) in a training set (n=40). Relationships between the methylation status of genes identified by MCAM and clinical features of the disease were tested in a validation set (n=75).;RESULTS:Methylation of RASSF1A progressively increased from small to malignant GISTs. p16 was specifically methylated in malignant-prone and malignant GISTs. MCAM analysis showed that more genes were methylated in advanced than in small GISTs (average of 473 genes vs 360 genes, respectively, P=0.012). Interestingly, the methylation profile of malignant GISTs was prominently affected by their location. Two genes, REC8 and

DOI： 10.1136/gut.2011.241034

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記述言語：日本語   出版者・発行元：(有)科学評論社  

医中誌

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1158/0008-5472.CAN-11-1053

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記述言語：日本語   出版者・発行元：日本電気泳動学会  

医中誌

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1158/0008-5472.CAN-11-1076

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.3892/ijo.2011.1048

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記述言語：英語   出版者・発行元：(一社)日本癌学会  

医中誌

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記述言語：英語   出版者・発行元：(一社)日本癌学会  

医中誌

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記述言語：英語   出版者・発行元：(一社)日本癌学会  

医中誌

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1038/ajg.2011.76

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1038/modpathol.2011.10

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記述言語：日本語   出版者・発行元：(株)東京医学社  

その他リンク： https://search.jamas.or.jp/index.php?module=Default&action=Link&pub_year=2011&ichushi_jid=J03723&link_issn=&doc_id=20110706160026&doc_link_id=%2Faq9seijd%2F2011%2F004106%2F026%2F0735-0737%26dl%3D0&url=http%3A%2F%2Fwww.medicalonline.jp%2Fjamas.php%3FGoodsID%3D%2Faq9seijd%2F2011%2F004106%2F026%2F0735-0737%26dl%3D0&type=MedicalOnline&icon=https%3A%2F%2Fjk04.jamas.or.jp%2Ficon%2F00004_2.gif

医中誌

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1371/journal.pone.0019618

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1158/1940-6207.CAPR-10-0214

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記述言語：日本語   掲載種別：研究論文（学術雑誌）  

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記述言語：日本語   出版者・発行元：(一財)日本消化器病学会  

その他リンク： https://search.jamas.or.jp/index.php?module=Default&action=Link&pub_year=2011&ichushi_jid=J01118&link_issn=&doc_id=20110117140001&doc_link_id=10027867238&url=http%3A%2F%2Fci.nii.ac.jp%2Fnaid%2F10027867238&type=CiNii&icon=https%3A%2F%2Fjk04.jamas.or.jp%2Ficon%2F00003_1.gif

医中誌

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1159/000332570

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記述言語：英語  

DOI： 10.1159/000320453

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1093/carcin/bgq203

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記述言語：日本語   出版者・発行元：札幌医科大学医学部  

Cancer is fundamentally a genetic and epigenetic disease that requires the accumulation of genomic alterations that inactivate tumor suppressors and activate proto-oncogenes. Two contradicting epigenetic events coexist in cancer: global hypomethylation, which is mainly observed in repetitive sequences within the genome, and regional hypermethylation, which is frequently associated with CpG islands within gene promoters. Hypermethylation alters the activity in a number of important signaling pathways by silencing expression of genes encoding Wnt antagonists, negative Ras effectors, and p53 targets. The list of genes aberrantly methylated in cancer is growing, and methylation of a p53 target micoRNA gene has been recently demonstrated. Global hypomethylation is strongly implicated in chromosomal instability and malignant potential of tumors. Sites of aberrant DNA methylation could be promising markers and targets for risk assessment, early detection and treatment of cancer.

その他リンク： http://ir.cc.sapmed.ac.jp/dspace/handle/123456789/5268

DOI： 10.15114/smj.79.1

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1158/1078-0432.CCR-10-0581

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記述言語：英語   出版者・発行元：(一社)日本癌学会  

医中誌

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記述言語：英語   出版者・発行元：(一社)日本癌学会  

医中誌

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1007/s10549-009-0600-1

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記述言語：英語   出版者・発行元：(一社)日本癌学会  

医中誌

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1111/j.1349-7006.2010.01581.x

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記述言語：日本語   出版者・発行元：日本電気泳動学会  

医中誌

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1038/onc.2010.117

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記述言語：英語  

DOI： 10.2217/IMT.10.10

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1093/carcin/bgp179

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1097/CEJ.0b013e328333fbe2

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1371/journal.pgen.1000816

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.3892/or_00000602

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記述言語：英語   掲載種別：論文集(書籍)内論文  

DOI： 10.1016/S0065-2660(10)70011-0

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記述言語：日本語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Japanese Journal of Cancer and Chemotherapy Publishers Inc.  

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記述言語：英語  

DOI： 10.2217/EPI.09.20

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1158/0008-5472.CAN-09-1595

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1053/j.gastro.2009.05.042

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記述言語：日本語   出版者・発行元：(一財)日本消化器病学会  

医中誌

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記述言語：英語   出版者・発行元：(一社)日本癌学会  

医中誌

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記述言語：英語   出版者・発行元：(一社)日本癌学会  

医中誌

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記述言語：英語   出版者・発行元：(一社)日本癌学会  

医中誌

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記述言語：英語   出版者・発行元：(一社)日本癌学会  

医中誌

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記述言語：英語   出版者・発行元：(一社)日本癌学会  

医中誌

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DOI： 10.1038/onc.2009.123

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1158/1078-0432.CCR-08-3336

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1158/1078-0432.CCR-08-2396

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