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1999 Fiscal Year Final Research Report Summary

The development and activation of MHC class II-restricted Blymphocytes.

Research Project

Project/Area Number 09470094
Research Category

Grant-in-Aid for Scientific Research (B)

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

Principal Investigator

HAMADKA Toshiydki  Graduate School of Medicine, Osaka University Professor, 医学系研究科, 教授 (60028529)

Co-Investigator(Kenkyū-buntansha) ONO Shiro  Grad. Sch Med., Osaka Univ. Associate Professor, 医学系研究科, 助教授 (80127208)
Project Period (FY) 1997 – 1999
KeywordsIa-restriction / B-cell differentiation / polyclonal IgM production / B-B cell interaction / LPS / Ia-deficient mice / Ig transgenic mice
Research Abstract

We have provided evidence supporting that self-I-A-restricted B-B cell interaction is involved in the PBA (polyclonal B-cell activator)-induced polyclonal differentiation of murine resting B cells into IgM-producing cells. In addition, experiments using double bone marrow chimeras have revealed that the I-A-restriction specificity is dictated by the Ia haplotype of bone marrow cells present during the B cell ontogeny but not by the Ia haplotype of a radiation-resistant host environment.
In the present study, utilizing Ia-deficient and Ig-transgenic mice we examined mechanisms by which I-A-restricted B cells are generated and activated. It was demonstrated that B cells from Ia-deficient mice are defective in LPS-induced polyclonal IgM Ab responses, but when Ia-deficient mice are neonatally administrated Ia-positive B cells as educator cells, the B cells become responsive to LPS in the presence of the Ia-expressing B cells as auxiliary cells almost the same as normal B cells. This suggests that I-A-restricted B-B cell interaction is mediated by non-Ia and Ia molecules. Moreover, B cells with monoclonal specificity obtained from Ig-transgenic mice failed to exhibit IgM Ab responses to LPS, indicating a possible involvement of sIg in the self-Ia recognition by responding B cells through non-Ia molecules.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] Maruo, S. et al.: "B cells regulate CD40 ligand-induced IL-12 production in antigen-presenting cells(APC) during T cell/APC interactions"J. Immunol.. 158. 120-126 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Wijesuria, R. et al.: "B cell-mediated down-regulation of IFN-γ and IL-12 production induced during anti-tumor immune responses in the tumor-bearing state"Int. Immunol.. 10. 1057-1065 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Tomura, M. et al.: "A novel Function of Va14+CD4+NKT cells : Stimulation of IL-12 production by antigen-presenting sells in the innate immune system"J. Immunol.. 163. 93-101 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Yashiro-Ohtani, Y. et al.: "Non-CD28 costimulately molecules present in T cell rafts induced T cell costimulation by enhancing the association of T cell receiptor with rafts"J. Immunol.. 164. 1251-1259 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Zhou, X-Y. et al.: "CD5 costimulation Up-Regulates the Signaling to Extracellular Signal-Regulated Kinase Activation in CD4+CD8+ Thymocytes and Supports Their Differentiation to the CD4 Lineage"J. Immunol.. 164. 1260-1268 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Ono, S. et al.: "A novel Function of B lymphocytes from normal mice to suppress autoimmunity in(NZB x NZW)Fl mice"Immunology. in press. (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Maruo, S. et al.: "B cells regulate CD40 ligand-induced IL-12 production in antigen-presenting cells (APC) during T cell/APC interactions."J. Immunol.. 158. 120-126 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Wijesuriya, R. et al.: "B cell-mediated down-regulation of IFN-g and IL-12 production induced during anti-tumor immune responses in the tumor-bearing state."Int. Immunol.. 10. 1057-1065 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tomura, M. et al.: "A novel function of Val4+CD4+NKT cells : Stimulation of IL-12 production by antigen-presenting cells in the innate immune system."J. Immunol.. 163. 93-101 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yashiro-Ohtani, Y. et al.: "Non-CD28 costimulatory molecules present in T cell rafts induce T cell costimulation by enhancing the association of T cell receptor with rafts."J. Immunol.. 164. 1251-1259 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Zhou, X. -Y. et al.: "CD5 Costimulation Up-Regulates the Signaling to Extracellular Signal-Regulated Kinase Activation in CD4+CD8+ Thymocytes and Supports Their Differentiation to the CD4 Lineage."J. Immunol.. 164. 1260-1268 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Ono, S. et al.: "A novel function of B lymphocytes from normal mice to suppress autoimmunity in (NZB x NZW) F1 mice."Immunology. (in press).

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2001-10-23  

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