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Elucidation of new control mechanisms of Bob1 in Th17 cells and its application to a disease-related marker

Research Project

Project/Area Number 19K16614
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 49030:Experimental pathology-related
Research InstitutionSapporo Medical University

Principal Investigator

Ippei Ikegami  札幌医科大学, 医学部, 助教 (80837021)

Project Period (FY) 2019-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2020: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2019: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
KeywordsBob1 / Th17 / EAE / Multiple Sclerosis / IL-17A
Outline of Research at the Start

難治性の自己免疫疾患の病態病理を解明し、診断方法、治療方法を確立することが社会的に求められている。我々はこれまでに転写共役因子Bob1がCD4陽性ヘルパーT細胞のうち抗体産生機構を司る濾胞ヘルパーT細胞に発現していることを初めて同定し、Bob1の機能的意義に着目している。更なる検討の結果、Bob1は濾胞ヘルパーT細胞だけでなく、他のCD4陽性T細胞サブセットにも発現していることを発見した。そこで本研究では、CD4陽性T細胞におけるBob1の機能制御機構の解明を目指す。本研究の成果を元に、CD4陽性T細胞が病態を形成する自己免疫疾患とBob1との関係を明らかにし、今後の臨床応用へと発展させたい。

Outline of Final Research Achievements

In this study, we performed functional analysis of the transcriptional coactivator Bob1 in CD4 positive (CD4+) T cells. We found that Bob1 knock out (KO) mice were resistant to experimental autoimmune encephalomyelitis (EAE) and the number of IL-17A-producing CD4+ T cell, which is involved in the pathogenesis of EAE, was decreased Bob1 KO mice compared to that in WT mice. These results suggest that Bob1 positively regulates IL-17A production in CD4+ T cells. We revealed new mechanisms that Bob1 enhances IL-17A expression by interacting with RORγt (Biochem Biophys Res Commun. 2019). Based on these results, we generated CD4+ T cell-specific Bob1 deficient mice further to know the role of Bob1 in CD4+ T cells in vivo.

Academic Significance and Societal Importance of the Research Achievements

Bob1はこれまでB細胞での機能的意義について検討されてきたが、本研究によりBob1はCD4陽性T細胞サブセットのうちTh17細胞のIL-17A産生に寄与すること見出した。Bob1は転写因子Oct1/2との結合様式が知られていたが、Th17細胞のマスター転写因子であるRORγtとBob1が結合し、転写活性を調節するという新規制御機構を初めて見出し、学術的に意義のある結果を得た。病原性CD4陽性T細胞の機能制御は不明な点が多いため、CD4陽性T細胞特異的Bob1欠損マウスを用いた研究により、CD4陽性T細胞が病態形成に寄与する疾患の理解が進み、得られた結果を医療社会に還元できると確信している。

Report

(3 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • Research Products

    (5 results)

All 2020 2019

All Journal Article (4 results) (of which Peer Reviewed: 4 results,  Open Access: 3 results) Presentation (1 results)

  • [Journal Article] Activated circulating T follicular helper cells and skewing of T follicular helper 2 cells are down-regulated by treatment including an inhaled corticosteroid in patients with allergic asthma2020

    • Author(s)
      Miyajima S, Shigehara K, Kamekura R, Takaki H, Yabe H, Ikegami I, Asai Y, Nishikiori H, Chiba H, Uno E, Takahashi H, Ichimiya S.
    • Journal Title

      Allergology International

      Volume: 69 Issue: 1 Pages: 66-77

    • DOI

      10.1016/j.alit.2019.08.008

    • NAID

      130007788688

    • ISSN
      1323-8930, 1440-1592
    • Related Report
      2020 Annual Research Report 2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Cytotoxic Tph-like cells are involved in persistent tissue damage in IgG4-related disease.2020

    • Author(s)
      Yabe H, Kamekura R, Yamamoto M, Murayama K, Kamiya S, Ikegami I, Shigehara K, Takaki H, Chiba H, Takahashi H, Takano K, Takahashi H, Ichimiya S.
    • Journal Title

      Mod Rheumatol.

      Volume: Feb 5 Issue: 1 Pages: 1-12

    • DOI

      10.1080/14397595.2020.1719576

    • Related Report
      2020 Annual Research Report 2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Bob1 enhances RORγt-mediated IL-17A expression in Th17 cells through interaction with RORγt.2019

    • Author(s)
      Ikegami I, Takaki H, Kamiya S, Kamekura R, Ichimiya S.
    • Journal Title

      Biochem Biophys Res Commun.

      Volume: 514 Issue: 4 Pages: 1167-1171

    • DOI

      10.1016/j.bbrc.2019.05.057

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] IL-10+ T follicular regulatory cells are associated with the pathogenesis of IgG4-related disease.2019

    • Author(s)
      Ito F, Kamekura R, Yamamoto M, Takano K, Takaki H, Yabe, H, Ikegami I, Shigehara K, Himi T, Takahashi H, Ichimiya S.
    • Journal Title

      Immunol Lett.

      Volume: 207 Pages: 56-63

    • DOI

      10.1016/j.imlet.2019.01.008

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] IgG4関連疾患におけるCX3CR1陽性Tph細胞の機能的役割2019

    • Author(s)
      矢部 勇人、亀倉 隆太、池上 一平、高木 宏美、高橋 弘毅、一宮 慎吾
    • Organizer
      第68回日本アレルギー学会学術集会
    • Related Report
      2019 Research-status Report

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Published: 2019-04-18   Modified: 2022-01-27  

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