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Control of hematopoietic cell differentiation by c-Fos and Bcl6

Research Project

Project/Area Number 13671047
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Hematology
Research InstitutionKumamoto University (2002)
Chiba University (2001)

Principal Investigator

OKADA Seiji  Kumamoto Univ. Center for AIDS Research. Div. Of Hematopoiesis, Professor, エイズ学研究センター, 教授 (50282455)

Co-Investigator(Kenkyū-buntansha) 幡野 雅彦  千葉大学, 大学院・医学研究院, 助教授 (20208523)
徳久 剛史  千葉大学, 大学院・医学研究院, 教授 (20134364)
Project Period (FY) 2001 – 2002
Project Status Completed (Fiscal Year 2002)
Budget Amount *help
¥4,000,000 (Direct Cost: ¥4,000,000)
Fiscal Year 2002: ¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 2001: ¥2,100,000 (Direct Cost: ¥2,100,000)
Keywordsc-Fos / Bcl6 / Differentiation / macrophage / Memory B cell / C-fos / 造血幹細胞 / BCL6 / BAZF / 転写抑制 / B細胞
Research Abstract

Proliferation and differentiation of hematologic cells are regulated by transcriptional factors. We have analyzed role of two immediated early genes, c-Fos and Bcl6.
c-Fos forms AP-1 complex with Jun family and regulates the expression of AP-1 binding genes. Expression of c-fos is induced in normal myelopoiesis. To explore the function of c-fos on myeloid differentiation, we used the murine myeloblastic leukemia cell line M1. Stimulation of M1 cells with LPS promotes their terminal differentiation into functional macrophages. Overexpression of c-fos in M1 cells dramatically increased sensitivity of the cells for LPS-induced differentiation and generation of morphologically differentiated cells. However, the overexpression did not modulate phagocytotic functions, surface expression of macrophage markers such as CD16/CD32 (FcgR) and CD54 (ICAM-1), and expression of lysozyme, esterase and c-fins mRNA. Induction of the class II MHC expression on M1 cells after stimulation was inhibited by t … More he overexpression. Expression of CIITA was also reduced in the M1 cells. Overexpression of c-fos in differentiating M1 cells perturbs their functional maturation.
The Bcl6 gene has been identified from the chromosomal translocation breakpoint in B-cell lymphoma and its product functions as a sequence-specific transcriptional repressor. After immunization with T cell-dependent antigens, the high-affinity B cells selected in germinal centers differentiate into memory B cells or long-lived antibody forming cells. We showed that Bcl6-deficient B cells, which cannot develop germinal centers, differentiated into IgM and IgG1 memory B cells but barely into long-lived IgG1 antibody forming cells in the bone marrow. Mutation in the V-heavy gene was nil in these memory B cells. Bcl6 and germinal center formation are essential for somatic hypermutation and affinity maturation, and generation of memory B cells can occur independent of germinal center formation, Ig class-switching and affinity maturation. Less

Report

(3 results)
  • 2002 Annual Research Report   Final Research Report Summary
  • 2001 Annual Research Report
  • Research Products

    (26 results)

All Other

All Publications (26 results)

  • [Publications] Sata M et al.: "Hematopoietic stem cells differentiate into vascular cells that participate in the pathogenesis of atherosclerosis"Nature Medicine. 8巻4号. 403-409 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Oshitari T et al.: "Suppression of c-fos mediates inhibition of cell death and increases neurite regeneration in retinal ganglion cells"Invest Ophthalmoll Vis Sci. 43巻7号. 2442-2449 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Ichii H et al.: "Role for Bcl6 in generation and maintenance of memory CD8+T cells"Nature Immunology. 3巻6号. 558-563 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Toyama H et al.: "Memory B cells without somatic hypermutation are generated from Bcl6-deficient B cells"Immunity. 17巻3号. 329-339 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Arima M et al.: "A pupative silencer element in the IL-5 gene recognized by Bcl6"The Journal of Immunology. 169巻2号. 829-836 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Obata S et al.: "Negative regulation of class II expression in macrophages by overexpression of the c-fos gene"Molecular Immunology. 39巻10号. 585-594 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Kojima S, Hatano M, Okada S, Fukuda T, Toyama Y, Yuasa S, Ito H, and Tokuhisa T: "Testicular germ cell apoptosis in Bcl6-deficient mice"Development. 128(1). 57-65 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Tety H, Okada S, Okabe S, Arima M, Hatano M, and Tokuhisa T: "Binding of BAZF and Bcl6 to STAT-binding DNA sequences"Biochem Biophys Res Comm. 284(1). 26-32 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Tokuhisa T, Hatano M, Okada S, Fukuda T, and Inada K: "Transcriptional regulation of memory B cell development"Mod Rheumatol. 11(1). 1-5 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Zhang H, Okada S, Hatano M, Okabe S, and Tokuhisa T: "A new functional domain of Bcl6 family that recruits histone deacethylases"Biochephys Acta. 1540(3). 188-200 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Ichii H, Sakamoto A, Hatano M, Okada S, Toyama H, Taki S, Arima M, Kuroda Y, and Tokuhisa T: "Role for Bcl6 in generation and maintenance of memory CD8+ T cells"Nature Immunol. 3(6). 558-563 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Arima M, Toyama H, Ichii H, Kojima S, Okada S, Hatano M, Cheng G, Kubo M, Fukuda T, and Tokuhisa T: "A pupative silencer element in the IL-5 gene recognized by Bcl6"J Immunol. 169(2). 829-836 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Toyama H, Okada S, Hatano M, Takahashi Y, Takeda N, Ichii H, Takemori T, Kuroda Y, and Tokuhisa T: "Memory B cells without somatic hypermutation are generated from Bcl6-deficient B cells"Immunity. 17(3). 329-339 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Obata S, Okada S, Ohkubo Y, Murasawa M, Hatano M, Sekiya S, and Tokuhisa T: "Negative regulation of class II expression in macrophages by overexpression of the c-fos gene"Mol Immunol. 39(10). 585-594 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Takenaga M, Hatano M, Takamori M, Yamashita Y, Okada S, Kuroda Y, and Tokuhisa T: "Bcl6-dependent transcriptional repression by BAZF"Biochem Biophys Res Commun. in press.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Sata M et al.: "Hematopoietic stem cells differentiate into vascular cells that participate in the pathogenesis of atherosclerosis"Nature Medicine. 8巻4号. 403-409 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Oshitari T et al.: "Suppression of c-fos mediates inhibition of cell death and increases neurite regeneration in retinal ganglion cells"Invest Ophthalmoll Vis Sci. 43巻7号. 2442-2449 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Ichii H et al.: "Role for Bcl6 in generation and maintenance of memory CD8+ T cells"Nature Immunology. 3巻6号. 558-563 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Tayama H et al.: "Memory B cells without somatic hypermutation are generated from Bcl6-deficient B cells"Immunity. 17巻3号. 329-339 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Arima M et al.: "A pupative silencer element in the IL-5 gene recognized by Bcl6"The Journal of Immunology. 169巻2号. 829-836 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Obata S et al.: "Negative regulation of class II expression in macrophages by overexpression of the c-fos gene"Molecular Immunology. 39巻10号. 585-594 (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] Tety H et al.: "Binding of BAZF and Bcl6 to STAT-binding DNA sequences"Biochemical and Biophysical Research Communications. 284巻1号. 26-32 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Zhang H et al.: "A new functional domain of Bcl6 family that recruits histone deacetylases"Biochimica et Biophysica Acta. 1540巻3号. 188-200 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Miyamoto T et al.: "Bifurcation of soteoblasts and dendritic cells from common progenitors"Blood. 98巻8号. 2544-2554 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Yokohari K et al.: "Molecular cloning of murine isoforms for a docking protein, BRDG1"Biochemical and Biophysical Research Communications. 289巻2号. 414-420 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Murasawa H et al.: "GL7 defines the cycling stage of pre-B cells in murine bone marrow"Europian Journal of Immunology. 32巻1号. 291-298 (2002)

    • Related Report
      2001 Annual Research Report

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Published: 2001-04-01   Modified: 2016-04-21  

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