論文 - 時野　隆至

FGFR Signaling as a Candidate Therapeutic Target for Cancers Resistant to Carbon Ion Radiotherapy.

Narisa Dewi Maulany Darwis, Ankita Nachankar, Yasushi Sasaki, Toshiaki Matsui, Shin-Ei Noda, Kazutoshi Murata, Tomoaki Tamaki, Ken Ando, Noriyuki Okonogi, Shintaro Shiba, Daisuke Irie, Takuya Kaminuma, Takuya Kumazawa, Mai Anakura, Souichi Yamashita, Takashi Hirakawa, Sangeeta Kakoti, Yuka Hirota, Takashi Tokino, Akira Iwase, Tatsuya Ohno, Atsushi Shibata, Takahiro Oike, Takashi Nakano

International journal of molecular sciences   20 ( 18 )  2019年09月  [査読有り]  [国際誌]

　概要を見る

Radiotherapy is an essential component of cancer therapy. Carbon ion radiotherapy (CIRT) promises to improve outcomes compared with standard of care in many cancers. Nevertheless, clinicians often observe in-field recurrence after CIRT. This indicates the presence of a subset of cancers that harbor intrinsic resistance to CIRT. Thus, the development of methods to identify and sensitize CIRT-resistant cancers is needed. To address this issue, we analyzed a unique donor-matched pair of clinical specimens: a treatment-naïve tumor, and the tumor that recurred locally after CIRT in the same patient. Exon sequencing of 409 cancer-related genes identified enrichment of somatic mutations in FGFR3 and FGFR4 in the recurrent tumor compared with the treatment-naïve tumor, indicating a pivotal role for FGFR signaling in cancer cell survival through CIRT. Inhibition of FGFR using the clinically available pan-FGFR inhibitor LY2874455 sensitized multiple cancer cell lines to carbon ions at 3 Gy (RBE: relative biological effectiveness), the daily dose prescribed to the patient. The sensitizer enhancement ratio was 1.66 ± 0.17, 1.27 ± 0.09, and 1.20 ± 0.18 in A549, H1299, and H1703 cells, respectively. Our data indicate the potential usefulness of the analytical pipeline employed in this pilot study to identify targetable mutations associated with resistance to CIRT, and of LY21874455 as a sensitizer for CIRT-resistant cancers. The results warrant validation in larger cohorts.

DOI PubMed

新規大腸がん線維芽細胞関連遺伝子の同定(Identification of a novel cancer associated fibroblast-related gene in colorectal cancer)

須藤 豪太, 山本 英一郎, 萬 顕, 新沼 猛, 杉本 亮, 北嶋 洋志, 久保 俊之, 畠中 柚衣, 甲斐 正広, 時野 隆至, 仲瀬 裕志, 菅井 有, 鈴木 拓

日本癌学会総会記事 ( 日本癌学会 )  78回   P - 3102  2019年09月

変異TP53遺伝子との相関が確認された新規遺伝子群の発見(Identification of novel TP53 mutation-associated genes through pan-cancer analysis)

丹下 正一郎, 井戸川 雅史, 時野 隆至

日本癌学会総会記事 ( (一社)日本癌学会 )  78回   P - 1192  2019年09月

新規p53標的遺伝子ARVCFはスプライシング変化を誘導し腫瘍抑制に寄与する(ARVCF, a novel p53 target, modulates the splicing landscape and supports the tumor suppressive function of p53)

井戸川 雅史, 鈴木 菜摘, 丹下 正一郎, 佐々木 泰史, 時野 隆至

日本癌学会総会記事 ( (一社)日本癌学会 )  78回   J - 3018  2019年09月

多発性骨髄腫における新規エピジェネティック併用療法の開発(Development of a new combinational epigenetic therapy of multiple myeloma)

石黒 一也, 北嶋 洋志, 新沼 猛, 石田 禎夫, 丸山 玲緒, 池田 博, 山本 英一郎, 甲斐 正広, 佐々木 泰史, 時野 隆至, 仲瀬 裕志, 鈴木 拓

日本癌学会総会記事 ( (一社)日本癌学会 )  78回   P - 2241  2019年09月

UHRF1 depletion and HDAC inhibition reactivate epigenetically silenced genes in colorectal cancer cells.

Takeshi Niinuma, Hiroshi Kitajima, Masahiro Kai, Eiichiro Yamamoto, Akira Yorozu, Kazuya Ishiguro, Hajime Sasaki, Gota Sudo, Mutsumi Toyota, Tomo Hatahira, Reo Maruyama, Takashi Tokino, Hiroshi Nakase, Tamotsu Sugai, Hiromu Suzuki

Clinical epigenetics   11 ( 1 ) 70 - 70  2019年05月  [査読有り]  [国際誌]

　概要を見る

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 PubMed

A subset of diffuse-type gastric cancer is susceptible to mTOR inhibitors and checkpoint inhibitors.

Hiroshi Fukamachi, Seon-Kyu Kim, Jiwon Koh, Hye Seung Lee, Yasushi Sasaki, Kentaro Yamashita, Taketo Nishikawaji, Shu Shimada, Yoshimitsu Akiyama, Sun-Ju Byeon, Dong-Hyuck Bae, Keisuke Okuno, Masatoshi Nakagawa, Toshiro Tanioka, Mikito Inokuchi, Hiroshi Kawachi, Kiichiro Tsuchiya, Kazuyuki Kojima, Takashi Tokino, Yoshinobu Eishi, Yong Sung Kim, Woo Ho Kim, Yasuhito Yuasa, Shinji Tanaka

Journal of experimental & clinical cancer research : CR   38 ( 1 ) 127 - 127  2019年03月  [査読有り]  [国際誌]

　概要を見る

BACKGROUND: Mechanistic target of rapamycin (mTOR) pathway is essential for the growth of gastric cancer (GC), but mTOR inhibitor everolimus was not effective for the treatment of GCs. The Cancer Genome Atlas (TCGA) researchers reported that most diffuse-type GCs were genomically stable (GS). Pathological analysis suggested that some diffuse-type GCs developed from intestinal-type GCs. METHODS: We established patient-derived xenograft (PDX) lines from diffuse-type GCs, and searched for drugs that suppressed their growth. Diffuse-type GCs were classified into subtypes by their gene expression profiles. RESULTS: mTOR inhibitor temsirolimus strongly suppressed the growth of PDX-derived diffuse-type GC-initiating cells, which was regulated via Wnt-mTOR axis. These cells were microsatellite unstable (MSI) or chromosomally unstable (CIN), inconsistent with TCGA report. Diffuse-type GCs in TCGA cohort could be classified into two clusters, and GS subtype was major in cluster I while CIN and MSI subtypes were predominant in cluster II where PDX-derived diffuse-type GC cells were included. We estimated that about 9 and 55% of the diffuse-type GCs in cluster II were responders to mTOR inhibitors and checkpoint inhibitors, respectively, by identifying PIK3CA mutations and MSI condition in TCGA cohort. These ratios were far greater than those of diffuse-type GCs in cluster I or intestinal-type GCs. Further analysis suggested that diffuse-type GCs in cluster II developed from intestinal-type GCs while those in cluster I from normal gastric epithelial cells. CONCLUSION: mTOR inhibitors and checkpoint inhibitors might be useful for the treatment of a subset of diffuse-type GCs which may develop from intestinal-type GCs.

DOI PubMed

DOT1L inhibition blocks multiple myeloma cell proliferation by suppressing IRF4-MYC signaling.

Kazuya Ishiguro, Hiroshi Kitajima, Takeshi Niinuma, Tadao Ishida, Reo Maruyama, Hiroshi Ikeda, Toshiaki Hayashi, Hajime Sasaki, Hideki Wakasugi, Koyo Nishiyama, Tetsuya Shindo, Eiichiro Yamamoto, Masahiro Kai, Yasushi Sasaki, Takashi Tokino, Hiroshi Nakase, Hiromu Suzuki

Haematologica   104 ( 1 ) 155 - 165  2019年01月  [査読有り]  [国際誌]

　概要を見る

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 PubMed

Prognostic Effect of Long Noncoding RNA NEAT1 Expression Depends on p53 Mutation Status in Cancer.

Masashi Idogawa, Hiroshi Nakase, Yasushi Sasaki, Takashi Tokino

Journal of oncology   2019   4368068 - 4368068  2019年  [査読有り]  [国際誌]

　概要を見る

Recently, many studies have revealed that long noncoding RNAs (lncRNAs) play important roles in various biological and pathological processes. Our previous study reported that lncRNA NEAT1 is a direct transcriptional target of p53. NEAT1 is an essential component of paraspeckles, which have recently been identified as a novel type of nuclear compartment. Although our previous findings indicate that NEAT1 induction contributes to the tumor-suppressor function of p53, the role of NEAT1 in cancer is still controversial. In this study, we comprehensively analyzed the relationship between NEAT1 expression and p53 mutation status. Interestingly, survival analysis based on NEAT1 expression in several cancer tissues revealed that the p53 wild-type group with high NEAT1 expression had a good prognosis, while poor prognosis or no correlation between NEAT1 expression and survival was observed in the p53-mutated group. These results demonstrate that the tumor-suppressive effect of NEAT1 depends on p53 function and is consistent with our previous report showing that NEAT1 supports the tumor-suppressive function of p53. Specifically, NEAT1 seems to play a tumor-suppressive role only in the presence of wild-type p53. These results provide important clues to the roles of NEAT1 in cancer.

DOI PubMed

Surface microstructures are associated with mutational intratumoral heterogeneity in colorectal tumors.

Taku Harada, Eiichiro Yamamoto, Hiro-O Yamano, Hironori Aoki, Hiro-O Matsushita, Kenjiro Yoshikawa, Ryo Takagi, Eiji Harada, Yoshihito Tanaka, Yuko Yoshida, Makoto Eizuka, Akira Yorozu, Gota Sudo, Hiroshi Kitajima, Takeshi Niinuma, Masahiro Kai, Yasushi Sasaki, Takashi Tokino, Tamotsu Sugai, Hiroshi Nakase, Hiromu Suzuki

Journal of gastroenterology   53 ( 12 ) 1241 - 1252  2018年12月  [査読有り]  [国内誌]

　概要を見る

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 PubMed

Exome sequence analysis of carcinomatous and sarcomatous elements of an esophageal carcinosarcoma

Sasaki Noriyuki, Iwaya Takeshi, Endo Fumitaka, Konosu Masafumi, Akiyama Yuji, Sasaki Yasushi, Tokino Takashi, Nishizuka Satoshi

CANCER SCIENCE   109   216  2018年12月  [査読有り]

Patient-specific circulating tumor DNA monitoring using digital PCR in esophageal squamous cell cancer patients

Iwaya Takeshi, Endo Fumitaka, Sasaki Yasushi, Yaegashi Mizunori, Sato Kei, Sasaki Noriyuki, Akiyama Yuji, Sasaki Akira, Masuda Mari, Tokino Takashi, Nishizuka Satoshi

CANCER SCIENCE   109   708  2018年12月  [査読有り]

Dysregulation of miRNA in chronic hepatitis B is associated with hepatocellular carcinoma risk after nucleos(t)ide analogue treatment.

Hideki Wakasugi, Hideaki Takahashi, Takeshi Niinuma, Hiroshi Kitajima, Ritsuko Oikawa, Naoki Matsumoto, Yuko Takeba, Takehito Otsubo, Masayuki Takagi, Yasushi Ariizumi, Michihiro Suzuki, Chiaki Okuse, Shogo Iwabuchi, Masayuki Nakano, Noriyuki Akutsu, Jong-Hon Kang, Takeshi Matsui, Norie Yamada, Hajime Sasaki, Eiichiro Yamamoto, Masahiro Kai, Yasushi Sasaki, Shigeru Sasaki, Yasuhito Tanaka, Hiroshi Yotsuyanagi, Takeya Tsutsumi, Hiroyuki Yamamoto, Takashi Tokino, Hiroshi Nakase, Hiromu Suzuki, Fumio Itoh

Cancer letters   434   91 - 100  2018年10月  [査読有り]  [国際誌]

　概要を見る

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 PubMed

Targeted next-generation sequencing of 50 cancer-related genes in Japanese patients with oral squamous cell carcinoma.

Nakagaki T, Tamura M, Kobashi K, Omori A, Koyama R, Idogawa M, Ogi K, Hiratsuka H, Tokino T, Sasaki Y

Tumour biology : the journal of the International Society for Oncodevelopmental Biology and Medicine   40 ( 9 ) 1010428318800180 - 1010428318800180  2018年09月  [査読有り]  [国際誌]

　概要を見る

Somatic mutation analysis is a standard of practice for human cancers to identify therapeutic sensitization and resistance mutations. We performed a multigene sequencing screen to explore mutational hotspots in cancer-related genes using a semiconductor-based sequencer. DNA from oral squamous cell carcinoma samples was used as a template to amplify 207 regions from 50 cancer-related genes. Of the 80 oral squamous cell carcinoma specimens from Japanese patients, including formalin-fixed paraffin-embedded samples, 56 specimens presented at least one somatic mutation among the 50 investigated genes, and 17 of these samples showed multiple gene somatic mutations. TP53 was the most commonly mutated gene (50.0%), followed by CDKN2A (16.3%), PIK3CA (7.5%), HRAS (5.0%), MET (2.5%), and STK11 (2.5%). In total, 32 cases (40.0%) were human papillomavirus positive and they were significantly less likely to have a TP53, mutation than human papillomavirus-negative oral squamous cell carcinomas (8/32, 25.0% vs 32/48, 66.7%, p = 0.00026). We also detected copy number variations, in which segments of the genome could be duplicated or deleted from the sequencing data. We detected the tumor-specific TP53 mutation in the plasma cell-free DNA from two oral squamous cell carcinoma patients, and after surgery, the test for these mutations became negative. Our approach facilitates the simultaneous high-throughput detection of somatic mutations and copy number variations in oral squamous cell carcinoma samples.

DOI PubMed

中枢神経系原発悪性リンパ腫におけるIon Reporterエクソームシーケンシングによる分子マーカー候補の同定(Identification of molecular marker candidate by Ion Reporter exome sequencing in primary central nervous system lymphoma)

高島 康郎, 佐々木 泰史, 早野 あづさ, 本間 順平, 深井 順也, 岩立 康男, 梶原 浩司, 石澤 伸, 本道 洋昭, 時野 隆至, 山中 龍也

日本癌学会総会記事 ( 日本癌学会 )  77回   2381 - 2381  2018年09月  [査読有り]

Digital PCRを用いた食道癌患者における症例特異的血漿中遊離DNAモニタリング(Patient-specific circulating tumor DNA monitoring using digital PCR in esophageal squamous cell cancer patients)

岩谷 岳, 遠藤 史隆, 佐々木 泰史, 八重樫 瑞典, 佐藤 慧, 佐々木 教之, 秋山 有史, 佐々木 章, 増田 万里, 時野 隆至, 西塚 哲

日本癌学会総会記事 ( 日本癌学会 )  77回   930 - 930  2018年09月  [査読有り]

大腸がんにおける腫瘍血管内皮関連遺伝子の同定(Identification and characterization of a tumor endothelium-related gene in colorectal cancer)

萬 顕, 山本 英一郎, 沼田 有斗, 新沼 猛, 北嶋 洋志, 甲斐 正広, 須藤 豪太, 黒瀬 誠, 時野 隆至, 仲瀬 裕志, 菅井 有, 鈴木 拓

日本癌学会総会記事 ( 日本癌学会 )  77回   1574 - 1574  2018年09月

新規大腸がん線維芽細胞関連遺伝子の同定(Identification of cancer-associated fibroblast-related genes in colorectal cancer)

沼田 有斗, 山本 英一郎, 萬 顕, 新沼 猛, 杉本 亮, 北嶋 洋志, 甲斐 正広, 青木 敬則, 須藤 豪太, 時野 隆至, 仲瀬 裕志, 菅井 有, 鈴木 拓

日本癌学会総会記事 ( 日本癌学会 )  77回   2189 - 2189  2018年09月

日本人口腔扁平上皮癌における癌関連50遺伝子を標的とした次世代シークエンサーによる解析(Targeted next-generation sequencing of 50 cancer-related genes in Japanese patients with oral squamous cell carcinoma)

荻 和弘, 中垣 貴文, 井戸川 雅史, 宮崎 晃亘, 時野 隆至, 佐々木 泰史

日本癌学会総会記事 ( (一社)日本癌学会 )  77回   784 - 784  2018年09月

新規p53標的遺伝子として同定されたp120カテニンファミリー蛋白の癌における役割(The roles of p120 catenin family protein as a novel p53 target in cancer)

鈴木 菜摘, 井戸川 雅史, 佐々木 泰史, 時野 隆至

日本癌学会総会記事 ( (一社)日本癌学会 )  77回   1301 - 1301  2018年09月