• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Receptor type protein tyrosine phosphatase, RPTPbeta on the surface of platelets:relationship to the Helicobacter pylori-related disease

Research Project

Project/Area Number 18591051
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Hematology
Research InstitutionUniversity of Yamanashi

Principal Investigator

OZAKI Yukio  University of Yamanashi, Interdisciplinary Graduate School Of Medicine And Engineering, Faculty Of Medicine, Department Of Clinical And Laboratory Medicine, Professor (30134539)

Co-Investigator(Kenkyū-buntansha) SUZUKI-INOUE Katsue  University of Yamanashi, Interdisciplinary Graduate School Of Medicine And Engineering, Faculty Of Medicine, Department Of Clinical And Laboratory Medicine, Associate Professor (10324211)
SATOH Kaneo  University of Yamanashi, Faculty of Medicine, Department Of Clinical And laboratory Medicine, Research Assistant (20242662)
Project Period (FY) 2006 – 2007
Project Status Completed (Fiscal Year 2007)
Budget Amount *help
¥3,890,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥390,000)
Fiscal Year 2007: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2006: ¥2,200,000 (Direct Cost: ¥2,200,000)
Keywordsplatelets / VacA / Gitl
Research Abstract

Helicobacter pylori is reportedly related to gastric ulcer/cancer, idiopathic thrombocytopenic purpura, and ischemic heart disease. We hypothesized that one of the causes of pylori-related diseases is VacA-stimulated platelet activation through interaction with RPTPbeta. The aim of this study in 2007 is to prove that VacA stimulates platelets by interacting with RPTPbeta using RPTPbeta-deficient mice and that in 2007 is to investigate signal transduction pathway mediated through RPTPbeta. In 2006, we failed to prove that VacA stimulates platelets by interacting with RPTPbeta and lost opportunity to use RPTPbeta-deficient mice. Therefore, we sought to identify another VacA receptor in platelets. MS/MS analysis revealed a macromolecule that is stored in the platelet alpha granule (named protein X) as one of the proteins associated with VacA-coated beads. We confirmed the binding between VacA and GST-protein X fusion protein using Biacore. We are now investigating VacA binding site in pro … More tein X. In other cells, an adapter protein, Git 1 is reported to undergo tyrosine phosphorylation downstream of RPTPbeta upon stimulation with VacA. Although VacA did not stimulate tyrosine phosphorylation of Git 1 in platelets, it is tyrosine-phosphorylated by outside-in signals downstream of integrin αIIbβ3. Since there has been no report about Git 1 expression in platelets, we decided to investigate regulation of Git 1 in platelets. We found that GIT 1 was abundantly expressed in platelets and underwent tyrosine phosphorylation downstream of integrin αIIbβ3, which was inhibited by the Src kinase inhibitor PP2. Furthermore, GIT1 constitutively associated with betaPlX, a guanine nucleotide exchange factor for Rac. The GIT1/betaPIX complex associated with allbp3, concomitantly with GIT1 tyrosine phosphorylation. Moreover, both GIT1 and αIIbβ3 rapidly translocated to the cytoskeletal fraction during platelet aggregation, which was not observed in the absence of aggregation. These results suggest that tyrosine phosphorylation of GIT1 by Src kinases may regulate cytoskeletal reorganization downstream of αIIbβ3 by bringing the Rac GEF betaPlX to the vicinity of the integrin. Less

Report

(3 results)
  • 2007 Annual Research Report   Final Research Report Summary
  • 2006 Annual Research Report
  • Research Products

    (9 results)

All 2008 2007

All Journal Article (2 results) (of which Peer Reviewed: 1 results) Presentation (7 results)

  • [Journal Article] Regulation of adaptor protein GIT1 in platelets, leading to the interaction between GIT1 and integrin alpha(IIb)beta3.2008

    • Author(s)
      Sato H, Suzuki-Inoue K, Inoue O, Ozaki Y.
    • Journal Title

      Biochem Biophys Res Commun. 368

      Pages: 157-61

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Annual Research Report 2007 Final Research Report Summary
    • Peer Reviewed
  • [Journal Article] Regulation of adaptor protein GIT1 in platelets, leading to the interaction between GIT1 and integrin alpha(IIlb)beta32008

    • Author(s)
      Sato, H., Suzuki-Inoue, K., Inoue, O., Ozaki, Y
    • Journal Title

      Biochem Biophys Res Commun 368

      Pages: 157-61

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] 血小板integrin αIIbβ3信号伝達系におけるARF-GAR, GIT1の役割2007

    • Author(s)
      佐藤一美、井上克枝、井上修、尾崎由基男
    • Organizer
      題30回日本血栓止血学会学術集会
    • Place of Presentation
      賢島
    • Year and Date
      2007-11-17
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Annual Research Report 2007 Final Research Report Summary
  • [Presentation] A role ARF-GAP, Gitl in integrin αIIbβ3-mediated signal transduction pathway in platelets2007

    • Author(s)
      H. Sato, K. Suzuki-Inoue, O. Inoue, Y. Ozaki
    • Organizer
      30th Congress of Japanese Society on of Thrombosis and Hemostasis
    • Place of Presentation
      Kashikojima
    • Year and Date
      2007-11-17
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] GIT1の血小板におけるインテグリンaIIbb3信号伝達系における役割2007

    • Author(s)
      佐藤一美、井上克枝、井上修、尾崎由基男
    • Organizer
      第69回日本血液学会総会
    • Place of Presentation
      横浜
    • Year and Date
      2007-10-11
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Annual Research Report 2007 Final Research Report Summary
  • [Presentation] A role of G protein-coupled receptor kinase-interacting proteinl (GIT1) downstream of integrin αIIbβ3 in platelets2007

    • Author(s)
      H. Sato, K. Suzuki-Inoue, O. Inoue, Y. Ozaki
    • Organizer
      The 69th Annual Meeting of the Japanese Society of Hematology
    • Place of Presentation
      Yokohama
    • Year and Date
      2007-10-11
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] [P-W-244]G PROTEIN-COUPLED RECEPTOR KINASE-INTERACTING PROTEIN1(GIT1)IS TYROSINE-PHOSPHORYLATED DOWNSTREA M OF INTEGRIN ALPHA IIB BETA3 IN PLATELETS2007

    • Author(s)
      H. Sato, K. Suzuki-Inoue, O. Inoue, Y. Ozaki
    • Organizer
      XXIst Congress of the International Society on Thrombosis and Haemostasis
    • Place of Presentation
      Geneva
    • Year and Date
      2007-07-11
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] G PROTEIN-COUPLED RECEPTOR ICINASE-INTERACTING PROTEIN1 (GIT1) IS TYROSINE-PHOSPHORYLATED DOWNSTREAM OF INTEGRIN ALPHA IIB BETA3 IN PLATELETS2007

    • Author(s)
      H. Sato, K. Suzuki-Inoue, O. Inoue, Y. Ozaki
    • Organizer
      XXIst Congress of the International Society on Thrombosis and Haemostasis Wednesday
    • Place of Presentation
      Geneva
    • Year and Date
      2007-07-11
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] G PROTEIN-COUPLED RECEPTOR KINASE-INTERACTING PROTEIN1(GIT1)IS TYROSINE-PHOSPHORYLATED DOWNSTREAM OF INTEGRIN ALPHA IIB BETA3 IN PLATELETS2007

    • Author(s)
      H. Sato, K. Suzuki-Inoue, O. Inoue, Y. Ozaki
    • Organizer
      XXIst Congress of the International Society on Thrombosis and Haemostasis
    • Place of Presentation
      Geneva
    • Year and Date
      2007-07-11
    • Related Report
      2007 Annual Research Report

URL: 

Published: 2006-04-01   Modified: 2016-04-21  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi