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Study of B cell antigen receptor (BCR)-mediated signal transduction pathway

Research Project

Project/Area Number 10470087
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Immunology
Research InstitutionKumamoto University

Principal Investigator

SAKAGUCHI Nobuo  Kumamoto University, School of Medicine, Professor, 医学部, 教授 (70192086)

Project Period (FY) 1998 – 1999
Project Status Completed (Fiscal Year 1999)
Budget Amount *help
¥10,200,000 (Direct Cost: ¥10,200,000)
Fiscal Year 1999: ¥4,900,000 (Direct Cost: ¥4,900,000)
Fiscal Year 1998: ¥5,300,000 (Direct Cost: ¥5,300,000)
Keywordsrapamycin / S6 kinase / mTor / protein synthesis pathway / Iga / MB-1 / B cell antigen receptor / gene knock out mice / 抗体産生 / CD40 / 抗原レセプター / 胚中心 / セントロサイト / モノクロナール抗体 / B細胞異常 / 抗体レパートリー
Research Abstract

We identified a novel phosphoprotein of BCR mediated signal transduction as a coprecipitated molecule with Iga (MB-1). The cDNA clone showed a unique structure and named it alpha4 as a fourth component associated with MB-1 protein. The yeast homologue (Tap42) was isolated by the other group and was found to be a critical molecule of the growth factor mediated signal transduction of rapamycin-sensitive pathway. The alpha4/Tap42 is now known as a major signal transduction molecule of rapamycin sensitive pathway leading to protein synthesis probably through the activation of S6 kinase activity.
We prepared the gene knock out mice and found that the alpha4 is essential for the growth especially at the embryonal development. By the conditional targeting strategy using Cre-lox P system we could delete the alpha4 locus on the X chromosome and show that alpha4 is also essential for the growth of mature B cells stimulated with BCR crosslinking. Here, we could clearly demonstrate that alpha4 is involved in the BCR-mediated signal transduction of rapamycin sensitivity for the protein synthesis. We will further study the biological function of alpha4 related pathway in the immune system.

Report

(3 results)
  • 1999 Annual Research Report   Final Research Report Summary
  • 1998 Annual Research Report
  • Research Products

    (27 results)

All Other

All Publications (27 results)

  • [Publications] Naomi Kuwata: "Absence of expression of RAG1 in peritoneal B-1 cells detected by knocking into RAG1 locus with green fluorescenct protein gene"J. Immunol.. 163. 6355-6359 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Kouji Hayashi: "Activity and substrate specificity of the mouse STK2 serine theonine kinase thatis structually related to the regular protein NIMA of Aspergiullus nidulans"Biochem. Biophys. Res. Commun.. 264. 449-456 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Kazuhiko Maeda: "A new member of the α4-related molecule (α4-b) thet binds to the protein phosphatase 2A is expressed selectively in the brain and testis"Eur. J. Biochem.. 263. 1-6 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Atsuko Sakata: "Involvement of a rapamycin-sensitive pathway in CD40-mediated activation of murine B cells in vitro"Immunology Letter. 68. 301-309 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Seiji inui: "Introduction of human CD$ gene with immunoglobulin enhancer and promoter creates mice with a population of human CD40^+ early B lineage cells in the bone marrow"Transgenics. 2. 347-356 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Masakazu Nanahoshi: "Alpha4 protein as a common regulator of type2A-related serine/threonine protein phosphatase"FEBS Letter. 446. 108-112 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Naomi Kuwata, Hideya Igarashi, Takafumi Ohmura, Shinichi Aizawa, and Nobuo Sakaguchi: "Absence of expression of RAG1 in peritoneal B-1 cells detected by knocking into RAG1 locus with green fluorescent protein gene."J. Immunol.. 163. 6355-6359 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Kouji Hayashi, Hideya Igarashi, Michio Ogawa, and Nobuo Sakaguchi: "Activity and substrate specificity of the mouse STK2 serine threonine kinase that is structurally related to the regulator protein NIMA of Aspergillus nidulans."Biochem. Biophys. Res. Commu.. 264. 449-456 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Kazuhiko Maeda, Seji Inui, Hideaki Tanaka, and Nobuo Sakaguchi: "A new member of the α4-related molecule (α4-b) that binds to the protein phosphatase 2A is expressed selectively in the brain and testis"Eur. J. Biochem.. 263. 1-6 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Atsuko Sakata, Kazuhiko Kuwahara, Takafumi Ohmura, Seiji Inui, and Nobuo Sakaguchi: "Involvement of a rapamycin- sensitive pathway in CD40 ィイD1-ィエD1mediated activation of murine B cells in vitro"Immunology Letter. 68. 301-309 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Seiji Inui, Atsuko Sakata, Kazuhiko Maeda, Junichi Miyazaki, and Nobuo Sakaguchi: "Introduction of human CD40 gene with immunoglobulin enhancer and promoter creates mice with a population of human CD40ィイD1+ ィエD1early B lineage cells in the bone marrow"Transgenics. 2. 347-356 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Masakazu Nanahoshi, Yosuke Tsujishita, Chiharu Tokunaga, Seiji Inui, Nobuo Sakaguchi, Kenta Hara, and Kazuyoshi Yonezawa: "Alpha4 protein as a common regulator of type2A-related serine/threonine protein phosphatases."FEBS Letter. 446. 108-112 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Masakazu Nanahoshi, Teruaki Nishiuma, Yosuke Tsujishita, Kenta Hara, Seiji Inui, Nobuo Sakaguchi, and Kazuyoshi Yonezawa.: "Regulation of protein phosphatase 2A catalytic activity by alpha4 protein and its yeast homolog Tap42"Biochem. Biophys. Res. Commu.. 251. 520-526 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Yoshinobu Matsuo, Akira Sugitomo, Kazuhiko Kuwahara, Yuko Watanabe, Atsuko Sakata, Nobuo Sakaguchi, Kimitaka Sagawa, and Kunzo Orita: "Monoclonal antibody NU-B1 reacts with novel antigen on human B-cells in mantle and marginal zones distinct from known CD molecules."Tissue Antigens. 52. 422-429 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Seiji Inui, Hideki Sanjo, Kazuhiko Maeda, and Nobuo Sakaguchi: "A lymphocyte signal transduction molecule alpha4 associates with the catalytic subunit of phosphatase 2A and acts as a new target of rapamycin"BLOOD. 92. 539-546 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Naomi Kuwata: "Absence of expression of RAG1 in peritoneal B-1 cells detected by knocking into RaG1 locus with green fluorescent protein gene."J. Immunol.. 163. 6355-6359 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Kouji Hayashi: "Activity and substrate speciticity of the mouse STK2 serine threonine kinase that is structurally related to the regulator protein NIMA of Aspergillus nidulans."Biochem. Biophys. Res. Commu.. 264. 449-456 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Kazuhiko Maeda: "A new member of the a4-related molecule (α4-b) that binds to the protein phosphatase 2A is expressed selectively in the brain and testis."Eur. J. Biochem.. 263. 1-6 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Atsuko Sakata: "Involvement of a rapamycin- sensitive pathway in CD40-mediated activation of murine B cells in vitro."Immunology Letter. 68. 301-309 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Seiji Inui: "Introduction of human CD40 gene with immunoglobulin enhancer and promoter creates mice with a population of human CD40+ early B lineage cells in the bone marrow."Transgenics. 2. 347-356 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Masakazu Nanahoshi: "Alpha4 protein as a common regulator of type2A-related serine/threonine protein phosphatases."FEBS Letter. 446. 108-112 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] S.Inui: "Introduction of human CD40 gene with immunoglobulin enhancer and promoter creates mice with a population of human CD40+ early B lineage cells in the bone marrow." Transgenics. 5. 1-10 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] K.Maeda: "The gene structure and promoter analysis of mouse lymphocyte signal transduction molecule α4 that is involved in a rapamycin-sensitive pathway." Gene. 210. 287-295 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] S.Inui: "A lymphocytesignal transduction molecule alpha4 associates with the catalytic subunitof hosphatase 2A andacts asa new targetof rapamycin." BLOOD. 92. 539-546 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Y.Matsuo: "Monoclonal antibody NU-B1 reacts with novel antigen on human B-cells in mantle and marginal zones distinct from known CD molecules." Tissue Antigens. 52. 422-429 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] M.Nanahoshi: "Regulation of protein phosphatase 2A catalytic activity by alpha4 protein and its yeast homolog Tap42." Biochem.Biophys.Res.Commu.251. 520-526 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] N.Nanahoshi: "Alpha4 protein as a common requlator of type2A-related serine/threonine proteinphosphatases." FEBS letter. (in press).

    • Related Report
      1998 Annual Research Report

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Published: 1998-04-01   Modified: 2016-04-21  

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