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Structural and functional analyzes of integrin αvβ3 : identification of ligand-binding sites in the αv subunit of αvβ3 and development of inhibitor for αvβ3

Research Project

Project/Area Number 12670989
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Hematology
Research InstitutionOsaka University

Principal Investigator

HONDA Shigenori  Osaka University, Graduate School of Medicine, Assistant Professor, 医学系研究科, 助手 (00303959)

Co-Investigator(Kenkyū-buntansha) KASHIWAGI Hirokazu  Osaka University Hospital, Medical Staff, 医学部附属病院, 医員
TOMIYAMA Yoshiaki  Osaka University, Graduate School of Medicine, Assistant Professor, 医学系研究科, 助手 (80252667)
Project Period (FY) 2000 – 2001
Project Status Completed (Fiscal Year 2001)
Budget Amount *help
¥3,300,000 (Direct Cost: ¥3,300,000)
Fiscal Year 2001: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 2000: ¥2,100,000 (Direct Cost: ¥2,100,000)
Keywordsintegrin / αvβ3 / ligand-binding site / dominant negative effect / αVβ3 / リガンド結合部位
Research Abstract

Integrin αvβ3, originally identified as the vitronectin receptor, is mainly expressed in the vascular or tumor tissues including endotherial cells, smooth muscle cells, and cancer cells. αvβ3 is now thought to play a key role in angiogenesis, tumor proliferation and metastasis. For these reasons, it is important in developing a new therapy to clarify the precise role of αvβ3 and control it.
The primary aims of this study are to identify the ligand-binding sites of integrin αvβ3, and elucidate the functional roles of this integrin, and develop inhibitors specific for αvβ3.
Identification of the ligand-binding sites in the αv subunit of αvβ3 and establishment of the cell lines expressing function-deficit αvβ3 : We succeeded to identify the ligand-binding site in the av subunit by performing alanine-scanning mutagenesis of recombinant αvβ3 expressed in 293 cells (a human embryonic kidney cell). For example, Tyr178Alaαvβ3 in which Tyr178 in the αv subunit is substituted with alanine, failed … More to bind soluble ligands including fibrinogen and a ligand-mimetic monoclonal antibody (WOW-1 Fab). Next, we established the cell line expressing Tyr178Alaαvβ3 by introducing mutant αv into the αv-deficit melanoma cell. The cell expressing Tyr178Alaαvβ3 markedly impaired cell adhesion to immobilized fibrinogen as well as vitronectin. Thus, the data confirm that Tyr178 is critical for receptor-ligand interaction.
Functional analyzes of mutant αvβ3 and development of inhibitors of αvβ3 : To investigate whether Tyr178Alaαvβ3 inhibit the function of endogenous integrins, we examined the effect of Tyr178Alaαvβ3 transiently transfected in the β3-293 cells that constitutively express wild-type αvβ3, on cell adhesive function. The β3-293 cell expressing Tyr178Alaαvβ3 markedly impaired cell adhesion to immobilized fibrinogen as compared with mock-transfected β3-293 cells, while the surface expression of endogenous αvβ3 was not suppressed in those cells. Thus, the data suggest that overexpression of Tyr178Alaαvβ3 may induce a dominant negative effect toward the function of endogenous αvβ3. Less

Report

(3 results)
  • 2001 Annual Research Report   Final Research Report Summary
  • 2000 Annual Research Report
  • Research Products

    (22 results)

All Other

All Publications (22 results)

  • [Publications] S.Kunishima, Y.Tomiyama, S.Honda, et al.: "Homozygous Pro74→Arg mutation in the platelet glycoprotein Ibβ gene associated with Bernard-Soulier syndrome"Thromb Haemost. 84(1). 112-117 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Y.Tomiyama: "Glanzmann thrombasthenia : integrin αIIbβ3 deficiency"Int J Hematol. 72(4). 448-454 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] S.Honda, Y.Tomiyama, H.Kashiwagi, et al.: "Ligand binding to integrin avβ3 requires Tyr178 in the αv subunit"Blood. 97(1). 175-182 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] S.Kosugi, Y.Tomiyama, S.Honda. et al.: "Anti-avβ3 antibodies in chronic immune thrombocytopenic purpura"Thromb Haemost. 85(1). 36-41 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] H.Kashiwagi, Y.Tomiyama, et al.: "Analyses of genetic abnormalities in type I CD36 deficiency in Japan : identification and cell biological characterization of two novel mutations that cause CD36 deficiency in man"Hum Genet. 108(6). 459-466 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] S.Kosugi, Y.Tomiyama, S.Honda. et al.: "Platelet-associated anti-GPIIb-IIIa autoantibodies in chronic immune thrombocytopenic purpura recognizing epitopes close to the ligand-binding site of glycoprotein (GP) IIb"Blood. 98(6). 1819-1827 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] S.Tadokoro, Y.Tomiyama, S.Honda, et al.: "Missense mutation in the β3 subunit have a different impact on the expression and function between αIIbβ3 and αvβ3"Blood. 99(3). 931-938 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] S. Kunishima. Y. Tomiyama. S. Honda. et al: "Homozygous Pro74→Arg mutation in the platelet glycoprotein Ibβ gene associated with Bernard-Soulier syndrome"Thromb Haemost. 84(1). 112-117 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Y. Tomiyama: "Glanzmann thrombasthenia : integrin αIIbβ3 deficiency"Int J Hematol. 72(4). 448-454 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] S. Honda, Y. Tomiyama, H. Kashiwagi, et al: "Ligand binding to integrin αvβ3 requires Tyr178 in the αv subunit"Blood. 97(1). 175-182 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] S. Kosugi, Y. Tomiyama, S. Honda, et al: "Anti-αvβ3 antibodies in chronic immune thrombocytopenic purpura"Thromb Haemost. 85(1). 36-41 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] H. Kashiwagi, Y. Tomiyama, et al: "analyzes of genetic abnormalities in type I CD36 deficiency in Japan : identification and cell biological characterization of two novel mutations that cause CD36 deficiency in man"Hum Genet. 108(6). 459-466 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] S. Kosugi. Y. Tomiyama, S. Honda, et al: "Platelet-associated anti-GPIIb-IIIa autoantibodies in chronic immune thrombocytopenic purpura recognizing epitopes close to the Hgand-binding site of glycoprotein (GP) IIb"Blood. 98(6). 1819-1827 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] S. Tadokoro, Y. Tomiyama, S. Honda, et al: "Missense mutation in the β3 subunit have a different impact on the expression and function between αIIbβ3 an αvβ3"Blood. 99(3). 931-938 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] S.Honda, Y.Tomiyama, H.Kashiwagi, et al.: "Ligand binding to integrin αvβ3 requires Tyr178 in the αv subunit"Blood. 97(1). 175-182 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] S.Kosugi, Y.Tomiyama, S.Honda, et al.: "Anti-αvβ3 antibodies in chronic immune thrombocytopenic purpura"Thromb Haemost. 85(1). 36-41 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] H.Kashiwagi, Y.Tomiyama, et al.: "Analyses of genetic abnormalities in type I CD36 deficiency in Japan : identification and cell biological characterization of two novel mutations that cause CD36 deficiency in man"Hum Genet. 108(6). 459-466 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] S.Kosugi, Y.Tomiyama, S.Honda, et al.: "Platelet-associated anti-GPIIb-IIIa autoantibodies in chronic immune thrombocytopenic purpura recognizing epitopes close to the ligand-binding site of glycoprotein (GP) IIb"Blood. 98(6). 1819-1827 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] S.Tadokoro, Y.Tomiyama, S.Honda, et al.: "Missense mutation in the β3 subunit have adifferent impact on the expression and function between αIIbβ3 and αvβ3"Blood. 99(3). 931-938 (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] Kunishima S,Tomiyama Y,Honda S, et al: "Homozygous Pro74→Arg mutation in the platelet glycoprotein Ib β gene associated with Bernard-Soulier syndrome."Thromb Haemost. 84(1). 112-117 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Honda S,Tomiyama Y,Pampori N, et al: "Ligand binding to integrin αvβ3 requires tyrosine 178 in the αv subunit."Blood. 97(1). 175-182 (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] Kosugi s,Tomiyama Y,Honda S, et al: "Anti-αvβ3 antibodies in chronic immune thrombocytopenic purpura"Thromb Haemost. 85(1). 36-41 (2001)

    • Related Report
      2000 Annual Research Report

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Published: 2000-04-01   Modified: 2016-04-21  

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