2005 Fiscal Year Final Research Report Summary
The mechanism of induction of ITP by H.pylori infection.
| Project/Area Number |
16590989
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
膠原病・アレルギー・感染症内科学
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| Research Institution | Oita University |
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Principal Investigator |
OGATA Masao Oita University, Faculty of medicine, Research assistant, 医学部, 助手 (10332892)
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| Co-Investigator(Kenkyū-buntansha) |
SATO Ryugo Oita University, Faculty of medicine, Research assistant, 医学部, 助手 (00325705)
MURAKAMI Kazunari Oita University, Faculty of medicine, Assistant Professor, 医学部, 助教授 (00239485)
GOTOH Kazuyo Oita University, Institute of Scientific Research, Research assistant, 総合科学研究支援センター, 助手 (30381031)
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| Project Period (FY) |
2004 – 2005
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| Keywords | ITP / H.pylori / EBV / BLC / TNF-α |
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| Research Abstract |
To investigate the possibility of an interaction between two ubiquitous human pathogens, Helicobacter pylori (H.pylori) and Epstein-Barr virus (EBV), the effect of monochloramine, locally produced by H.pylori infection, on gastric epithelium latently infected with EBV was examined, by assessing the induction of EBV lytic infection. AGS cells harbouring latently infected EBV were used as the indicator of lytic change caused by monochloramine treatment. Lytic infection, determined by morphological change and EA-D antigen expression, occurred immediately after treatment with in vitro-synthesized monochloramine. Analysis of EBV infection in human gastric tissue revealed that out of 48 H.-pylori-positive patients, 24 were positive for EBER-1, and 18 and 13 were positive for EBNA1 and LMP-a antigen, respectively. The results suggest that H.pylori-associated monochloramine induces EBV lytic conversion in gastric epithelium latently infected with EBV.
Helicobacter pylori is a gram-negative bacterium that colonizes the human stomach and causes chronic gastric diseases. It is recognized as the etiologic agent of atrophic gastritis, peptic ulcer, intestinal metaplasia, MALToma and gastric cancer. Various pathogenic proteins of H.pylori have been reported, such as VacA, CagA, LPS, HSP60 and unease. Dendritic cells (DCs) are potent antigen-presenting cells that initiate acquired immune responses. Previously HP-MP1 has been reported as a new proinflammatory mediator in stomach infected with H.pylori and HP0596 gene is homologous to HP-MP1. We designated the HP0596 gene as the TNF-a inducing protein (Tipa) and Tipa was present in the culture medium of H.pylori. We also reported that Monomer Tipa is 19kDa-sized protein located in H.pylori membrane fraction and forms homodimer structure due to two cysteine residues in N-terminal site. In this study, we report here an immunomodulatory effect of novel Tipa protein of H.pylori to DCs.
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[Journal Article] Response to Cyclosporine Therapy in Patients with Myelodysplastic Syndrome : A Clinical Study of 12 Cases and Literature Review2004
Author(s)
Masao Ogata, Eiichi Ohtsuka, Tomoyuki Imamura, Junji Ikewaki, Yuko Ogata, Kazuhiro Kohno, Toshiyuki Nakayama, Keiji Ono, Yoshio Saburi, Hiroshi Kikuchi, Masaru Nasu
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Journal Title
International Journal of Hematology 80(1)
Pages: 35-42
Description
「研究成果報告書概要(和文)」より
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[Journal Article] Effect of Helicobacter pylori Eradication on Platelet Recovery in Patients With Chronic Idiopathic Thrombocytopenic Purpura.2004
Author(s)
Sato R, Murakami K, Watanabe K, Okimoto T, Miyajima H, Ogata M, Ohtsuka E, Kodama M, Saburi Y, Fujioka T, Nasu M.
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Journal Title
Arch Intern Med Sept.27 174(17)
Pages: 1904-1907
Description
「研究成果報告書概要(和文)」より
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[Journal Article] ^* Response to Cyclosporine Therapy in Patients with Myelodysplastic Syndrome : A Clinical Study of 12 Cases and Literature Review2004
Author(s)
Masao Ogata, Eiichi Ohtsuka, Tomoyuki Imamura, Junji Ikewaki, Yuko Ogata, Kazuhiro Kohno, Toshiyuki Nakayama, Keiji Ono, Yoshio Saburi, Hiroshi Kikuchi, Masaru Nasu.
-
Journal Title
International Journal of Hematology 80(1)
Pages: 35-42
Description
「研究成果報告書概要(欧文)」より
-
[Journal Article] ^* Effect of Helicobacter pylori Eradication on Platelet Recovery in patients With Chronic Idiopathic Thrombocytopenic Purpura.2004
Author(s)
Sato R, Murakami K, Watanabe K, Okimoto T, Miyajima H, Ogata M, Ohtsuka E, Kodama M, Saburi Y, Fujioka T, Nasu M.
-
Journal Title
Arch Intern Med Sept.27, 174(17)
Pages: 1904-1907
Description
「研究成果報告書概要(欧文)」より
