Papers - IYAMA Satoshi

ヒトTERT-stroma細胞を用いた末梢血CD133陽性細胞のex vivo増幅系の確立

小船 雅義, 河野 豊, 千葉 大樹, 井山 諭, 佐藤 勉, 瀧本 理修, 松永 卓也, 加藤 淳二, 濱田 洋文, 新津 洋司郎

臨床血液 ( (一社)日本血液学会-東京事務局 )  47 ( 9 ) 1151 - 1151  2006.09  [Refereed]

[De novo CD5-positive diffuse large B-cell lymphoma associated with autoimmune hemolytic anemia presenting as erythroid hypoplasia].

Kuroda H, Matsunaga T, Iyama S, Takimoto R, Shirao S, Kida M, Watanabe H, Konuma Y, Hirayama Y, Kohda K, Niitsu Y

[Rinsho ketsueki] The Japanese journal of clinical hematology ( 7 )  47 ( 7 ) 633 - 638  2006.07  [Refereed]

DOI PubMed CiNii

Amelioration of murine dextran sulfate sodium-induced colitis by ex vivo extracellular superoxide dismutase gene transfer

Takatomi Oku, Satoshi Iyama, Tsutomu Sato, Yasushi Sato, Maki Tanaka, Tamotsu Sagawa, Kageaki Kuribayashi, Tetsuya Sumiyoshi, Kazuyuki Murase, Takuro Machida, Tetsuro Okamoto, Takuya Matsunaga, Tetsuji Takayama, Minoru Takahashi, Junji Kato, Hirofumi Hamada, Yoshiro Niitsu

INFLAMMATORY BOWEL DISEASES ( LIPPINCOTT WILLIAMS & WILKINS )  12 ( 7 ) 630 - 640  2006.07  [Refereed]

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Background: Although the etiology of inflammatory bowel disease has not been fully clarified, reactive oxygen species is speculated to be involved. Extracellular superoxide dismutase (EC-SOD), an isozyme of SODs, is known to function mainly in body fluids. We investigated the efficacy of an ex vivo EC-SOD gene transfer into dextran sulfate sodium (DSS)-induced colitis mice. Materials and Methods: Experimental colitis was induced by providing Balb/c mice with DSS in sterile distilled water provided as desired. The syngenic fibroblasts were obtained from Balb/c mice embryos and retrovirally transduced with the hEC-SOD gene. These engineered cells were confirmed to secrete EC-SOD in culture medium by enzyme-linked immunosorbent assay and were inoculated subcutaneously in the backs of DSS-treated mice. Mucosal injury of the colon was evaluated by the disease activity index (DAI: body weight, rectal bleeding, and stool consistency), grading of histologic disease severity, and levels of cytokine (tumor necrosis factor-alpha, interieukin-1 beta) production. 8-Hydroxydeoxyguanosine (8-OHdG) levels in the mucosal tissue were assessed by immunohistochemical staining. Malondialdehyde (MDA) was measured using a colorimetric assay. Results: A significant improvement was observed in DAI score and histologic severity as well as in mucosal tissue levels of inflammatory cyrokines, 8-OHdG, and MDA of mice treated with the EC-SOD gene as compared with those without gene therapy, not only in a mild colitis model but also in a severe colitis model. Survival of treated mice in these models was significantly prolonged. Conclusions: Ex vivo transfer of the EC-SOD gene was feasible for treatment of DSS-induced colitis.

DOI PubMed

[Enteropathy-type T-cell lymphoma with CD8 and CD56 expression].

Sato T, Matsunaga T, Iyama S, Sakai T, Murase K, Sato Y, Kobune M, Takimoto R, Kato J, Niitsu Y

[Rinsho ketsueki] The Japanese journal of clinical hematology ( 7 )  47   645 - 649  2006.07  [Refereed]

DOI PubMed

Human herpesvirus-6 hepatitis associated with cyclosporine-A encephalitis after bone marrow transplantation for chronic myeloid leukemia

Kageaki Kuribayashi, Takuya Matsunaga, Satoshi Iyama, Koichi Takada, Tsutomu Sato, Kazuyuki Murase, Akihito Fujimi, Rishu Takimoto, Johji Kawanishi, Yoshiro Niitsu

INTERNAL MEDICINE ( JAPAN SOC INTERNAL MEDICINE )  45 ( 7 ) 475 - 478  2006  [Refereed]

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A 31-year-old man referred to our hospital for treatment of his chronic myeloid leukemia (CML) in the first chronic phase by bone marrow transplantation. We pretreated him with cyclophosphamide and total body irradiation and bone marrow transplantation (BMT) was carried out. On day 31, the engraftment was confirmed and on day 52, acute graft versus host disease (GVHD) was observed. On day 189, he lost consciousness due to cyclosporine A-induced leukoencephalopathy and 375 mg cyclosporine A was changed to 100 mg prednisolone. On day 199, liver dysfunction (AST 410 IU/L, ALT 557 IU/L, gamma GTP 385 IU/L, ALP 363 IU/L, D-Bil 0.3 mg/dl) developed and a liver biopsy was performed. PCR analysis of DNA from the liver biopsy specimen was positive for HHV-6 and immunostaining using anti-HHV-6 and anti-HHV-6b antibodies showed positive staining in the cytosol of hepatocytes. No other viruses were found to induce hepatitis. From these results, he was diagnosed as having HHV-6 hepatitis and it was successfully treated with gancyclovir (GCV) administration.

DOI PubMed

[Two cases of primary skeletal muscle lymphoma, and a review of the literature].

Ueno A, Kuribayashi K, Iyama S, Matsunaga T, Kikuchi S, Sato T, Kobune M, Takimoto R, Kato J, Niitsu Y

[Rinsho ketsueki] The Japanese journal of clinical hematology ( 10 )  46   1141 - 1145  2005.10  [Refereed]

DOI PubMed

[Essential thrombocythemia associated with incomplete type intestinal Behçet disease during hydroxyurea treatment].

Kobune M, Kato J, Kuribayashi K, Iyama S, Fujimi A, Murase K, Ueno A, Kikuchi S, Satoh T, Okamoto T, Takimoto R, Matsunaga T, Niitsu Y

[Rinsho ketsueki] The Japanese journal of clinical hematology   46 ( 10 ) 1136 - 1140  2005.10  [Refereed]

DOI PubMed

Donor cell derived acute myeloid leukemia after allogeneic cord blood transplantation in a patient with adult T-cell lymphoma

T Matsunaga, K Murase, M Yoshida, A Fujimi, S Iyama, K Kuribayashi, T Sato, K Kogawa, Y Hirayama, S Sakamaki, K Kohda, Y Niitsu

AMERICAN JOURNAL OF HEMATOLOGY ( WILEY-LISS )  79 ( 4 ) 294 - 298  2005.08  [Refereed]

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We report a patient with adult T-cell lymphoma who developed acute myeloid leukemia (AML) after allogeneic cord blood transplantation (CBT). Fluorescence in situ hybridization (FISH) studies and molecular analysis using short tandem repeat (STR) sequences proved the AML to be of donor origin. Although 25 cases of donor cell leukemia (DCL) occurring after allogeneic bone marrow transplantation have previously been reported, there have been no reports of DCL after CBT. This case is the first-reported DCL patient after CBT.

DOI PubMed

Human mesenchymal stem cells xenografted directly to rat liver are differentiated into human hepatocytes without fusion

Y Sato, H Araki, J Kato, K Nakamura, Y Kawano, M Kobune, T Sato, K Miyanishi, T Takayama, M Takahashi, R Takimoto, S Iyama, T Matsunaga, S Ohtani, A Matsuura, H Hamada, Y Niitsu

BLOOD ( AMER SOC HEMATOLOGY )  106 ( 2 ) 756 - 763  2005.07  [Refereed]

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Hepatic transdifferentiation of bone marrow cells has been previously demonstrated by intravenous administration of donor cells, which may recirculate to the liver after undergoing proliferation and differentiation in the recipient's bone marrow. In the present study, to elucidate which cellular components of human bone marrow more potently differentiate into hepatocytes, we fractionated human bone marrow cells into mesenchymal stem cells (MSCs), CD34(+) cells, and non-MSCs/ CD34(-) cells and examined them by directly xenografting to allylalcohol (AA)- treated rat liver. Hepatocyte-like cells, as revealed by positive immunostaining for human-specific alpha-fetoprotein (AFP), albumin (Alb), cytokeratin 19 (CK19), cytokeratin 18 (CK18), and asialoglycoprotein receptor (AGPR), and by reverse transcription-polymerase chain reaction (RTPCR) for expression of AFP and Alb mRNA, were observed only in recipient livers with MSC fractions. Cell fusion was not likely involved since both human and rat chromosomes were independently identified by fluorescence in situ hybridization (FISH). The differentiation appeared to follow the process of hepatic ontogeny, reprogramming of gene expression in the genome of MSCs, as evidenced by expression of the AFP gene at an early stage and the albumin gene at a later stage. In conclusion, we have demonstrated that MSCs are the most potent component in hepatic differentiation, as revealed by directly xenografting into rat livers.

DOI PubMed

[Successful treatment with oral ribavirin of adenovirus-associated hemophagocytic syndrome in a stem cell transplantation recipient].

Iyama S, Matsunaga T, Fujimi A, Murase K, Kuribayasi K, Sato T, Hirayama Y, Sakamaki S, Kohda K, Niitsu Y

[Rinsho ketsueki] The Japanese journal of clinical hematology ( 5 )  46 ( 5 ) 363 - 367  2005.05  [Refereed]

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A 51-year-old woman with severe aplastic anemia underwent allogeneic peripheral blood stem cell transplantation using blood stem cells from an HLA-identical sibling. Adenovirus type 11 hemorrhagic cystitis developed and progressed to nephritis and hemophagocytic syndrome. Oral ribavirin was effective not only for the hemorrhagic cystitis and nephritis but also for the hemophagocytic syndrome. Since therapeutic strategies for adenovirus infection after hematopoietic stem cell transplantation have not been established, we present our case and discuss the therapeutic approach.

DOI PubMed CiNii

Prolonged survival of mice with multiple liver metastases of human colon cancer by intravenous administration of replicable E1B-55K-deleted adenovirus with E1A expressed by CEA promoter

T Sagawa, M Takahashi, T Sato, Y Sato, Y Lu, T Sumiyoshi, Y Yamada, S Iyama, J Fukaura, K Sasaki, H Hamada, K Miyanishi, T Takayama, J Kato, Y Niitsu

MOLECULAR THERAPY ( ACADEMIC PRESS INC ELSEVIER SCIENCE )  10 ( 6 ) 1043 - 1050  2004.12  [Refereed]

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Liver is the most preferential site for metastasis of colon cancer. We, in the present study, constructed a self-replicable adenovirus in which EIIA is driven by a CEA promoter and E1B-55K is deleted from the E1B region (AdCEAp/Rep) and examined its effects on multiple metastases of a human colon cancer cell in a mouse xenograft model. We first showed effective replication of the virus in various CEA-producing human colon cancer cells (M7609, HT-29) and subsequent lysis of the infected cells in vitro. We then demonstrated that a single intratumoral injection of the virus (1 x 10(8) PFU/100 mul) induced a complete regression of subcutaneous tumors (M7609) inoculated into nude mice. Further, we demonstrated that systemic administration of the virus (1 x 10(8) PFU/100 mul) through the tail vein to nude mice, which 1 week prior had been inoculated with tumor cells (colon carcinoma cell line HT-29) via the spleen and showed apparent multiple metastases in the liver, effectively suppressed the metastasis formation. The mean survival time of the treated mice was significantly longer than that of the controls. Thus, the systemic administration of AdCEAp/Rep was considered to be effective on multiple liver metastases of CEA-positive colon cancer in a xenograft model.

DOI PubMed

Interleukin-11 as an osteoprotegerin-inducing factor in culture medium of blastic cells from a patient with acute megakaryocytic leukemia complicated with osteosclerosis

T Sato, T Matsunaga, M Kida, K Morii, T Machida, Y Kawano, K Nakamura, K Kuribayashi, K Takada, S Iyama, Y Sato, T Takayama, M Takahashi, J Kato, M Chokki, Y Niitsu

AMERICAN JOURNAL OF HEMATOLOGY ( WILEY-LISS )  77 ( 1 ) 62 - 66  2004.09  [Refereed]

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We came across a rare case of acute megalkaryocytic leukemia, the clinical course of which was relatively chronic and nonaggressive. This case was complicated with generalized severe osteosclerosis (OS). The medium in which blastic cells from the patient were cultured showed a strong activity to enhance the expression of an osteosclerotic cytokine, osteoprotegerin (OPG), as revealed by real-time quantitative RT-PCR and Western blot analysis. The OPG-inducing activity of the culture medium was neutralized by the anti-interieukin-11 (IL-11) antibody. These results indicate that IL-11 produced by the blasts was a causative factor of the OS observed in this patient. (C) 2004 Wiley-Liss, Inc.

DOI PubMed

遺伝子治療 AFP産生肝癌に対する制限増殖型アデノウイルス,p53遺伝子,5-FUの3者併用は高い抗腫瘍効果を示す

山田 康之, 高橋 稔, 佐川 保, 佐藤 康史, 佐藤 勉, 深浦 純生, 井山 諭, 佐々木 勝則, 中村 公則, 濱田 洋文, 新津 洋司郎

日本癌治療学会誌 ( (一社)日本癌治療学会 )  39 ( 2 ) 397 - 397  2004.09

Fas-mediated apoptosome formation is dependent on reactive oxygen species derived from mitochondrial permeability transition in Jurkat cells

T Sato, T Machida, S Takahashi, S Iyama, Y Sato, K Kuribayashi, K Takada, T Oku, Y Kawano, T Okamoto, R Takimoto, T Matsunaga, T Takayama, M Takahashi, J Kato, Y Niitsu

JOURNAL OF IMMUNOLOGY ( AMER ASSOC IMMUNOLOGISTS )  173 ( 1 ) 285 - 296  2004.07  [Refereed]

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Generation of reactive oxygen species (ROS) and activation of caspase cascade are both indispensable in Fas-mediated apoptotic signaling. Although ROS was presumed to affect the activity of the caspase cascade on the basis of findings that antioxidants inhibited the activation of caspases and that the stimulation of ROS by itself activated caspases, the mechanism by which these cellular events are integrated in Fas signaling is presently unclear. In this study, using human T cell leukemia Jurkat cells as well as an in vitro reconstitution system, we demonstrate that ROS are required for the formation of apoptosome. We first showed that ROS derived from mitochondrial permeability transition positively regulated the apoptotic events downstream of mitochondrial permeability transition. Then, we revealed that apoptosome formation in Fas-stimulated Jurkat cells was clearly inhibited by N-acetyl-L-cysteine and manganese superoxide dismutase by using both the immunoprecipitation and size-exclusion chromatography methods. To confirm these in vivo findings, we next used an in vitro reconstitution system in which in vitro-translated apoptotic protease-activating factor 1 (Apaf-1), procaspase-9, and cytochrome c purified from human placenta were activated by dATP to form apoptosome; the formation of apoptosome was markedly inhibited by reducing reagents such as DTT or reduced glutathione (GSH), whereas hydrogen peroxide prevented this inhibition. We also found that apoptosome formation was substantially impaired by GSH-pretreated Apaf-1, but not GSH-pretreated procaspase-9 or GSH-pretreated cytochrome c. Collectively, these results suggest that ROS plays an essential role in apoptosome formation by oxidizing Apaf-1 and the subsequent activation of caspase-9 and -3.

PubMed

[A case of gastric carcinoma with multiple skin, bone, and bilateral ovary metastasis; effective treatment by chemotherapy].

Mezawa S, Homma H, Doi T, Akiyama T, Murakami K, Kogawa K, Hirata K, Kida M, Murase K, Iyama S

Gan to kagaku ryoho. Cancer & chemotherapy ( 12 )  30   1973 - 1975  2003.11  [Refereed]

PubMed

Superselective transcatheter embolization for acute lower gastrointestinal hemorrhage after endoscopic mucosal resection: A report of 3 cases

S Mezawa, H Homma, K Murase, T Doi, S Iyama, K Takada, K Hirata, F Mezawa, Y Niitsu

HEPATO-GASTROENTEROLOGY ( H G E UPDATE MEDICAL PUBLISHING S A )  50 ( 51 ) 735 - 737  2003.05  [Refereed]

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One of the most common complications related to endoscopic mucosal resection is hemorrhage; in almost every case, the bleeding is endoscopically managed, but some cases are unresponsive to the treatment. We have encountered three cases of endoscopically uncontrollable lower gastrointestinal hemorrhage after endoscopic mucosal resection in the colon which we successfully treated by urgent superselective transcatheter embolization. In our three cases, massive hemorrhage occurred immediately after endoscopic mucosal resection of a sessile polyp 25-40mm in diameter, two cases in the ascending colon and one in the rectum. Although hemoclip placement was attempted in every case, hemostasis was not achieved. Emergency angiography disclosed massive extravasation of the contrast material in the colon. Hemostasis was achieved immediately after superselective transcatheter arterial embolizations with microcoils, with no observable ischemic complications and without the need of transfusions. In conclusion, superselective transcatheter embolization with microcoils should be considered a safe and efficient treatment option for endoscopically uncontrollable lower gastrointestinal hemorrhage occurring after endoscopic mucosal resection.

PubMed

[A case responding to weekly paclitaxel (TXL) therapy as third line chemotherapy for scirrhous type gastric cancer].

Sagawa T, Tsuji Y, Takayanagi N, Hirayama Y, Sakamaki S, Chiba H, Nakajima T, Iyama S, Oku T, Sumiyoshi T, Sato Y, Takahashi M, Takayama T, Niitsu Y

Gan to kagaku ryoho. Cancer & chemotherapy ( 5 )  30   707 - 710  2003.05  [Refereed]

PubMed

[A case of irinotecan-resistant colon cancer responding to chronotherapy with oxaliplatin, 5-FU, l-LV].

Sagawa T, Tsuji Y, Takayanagi N, Hirayama Y, Sakamaki S, Chiba H, Iyama S, Oku T, Sato Y, Takahashi M, Takayama T, Niitsu Y

Gan to kagaku ryoho. Cancer & chemotherapy ( 4 )  30   537 - 543  2003.04  [Refereed]

PubMed

肝腫瘍に対する食塩水注入併用ラジオ波凝固療法による播種の危険性

太田 英敏, 新谷 直昭, 高橋 康雄, 藤川 幸司, 井山 諭, 中村 とき子

肝臓 ( 一般社団法人 日本肝臓学会 )  43 ( 12 ) 583 - 583  2002.12

DOI CiNii

[Usefulness of CT arteriography for transcatheter peripancreatic arterial embolization to patients with advanced pancreatic cancer].

Doi T, Homma H, Mezawa S, Akiyama T, Machida T, Murakami K, Hirata K, Takanashi N, Iyama S, Niitsu Y

Gan to kagaku ryoho. Cancer & chemotherapy ( 12 )  29   2298 - 2301  2002.11  [Refereed]

PubMed