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Investigating the mechanisms of B cell lymphomagenesis driven by MYD88 and CD79B mutations

Research Project

Project/Area Number 20H03518
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 50010:Tumor biology-related
Research InstitutionKumamoto University

Principal Investigator

Horikawa Keisuke  熊本大学, 国際先端医学研究機構, 客員准教授 (60313095)

Co-Investigator(Kenkyū-buntansha) 滝澤 仁  熊本大学, 国際先端医学研究機構, 特別招聘教授 (10630866)
Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥16,770,000 (Direct Cost: ¥12,900,000、Indirect Cost: ¥3,870,000)
Fiscal Year 2022: ¥7,670,000 (Direct Cost: ¥5,900,000、Indirect Cost: ¥1,770,000)
Fiscal Year 2021: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2020: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Keywords悪性リンパ腫 / 遺伝子変異 / B細胞 / シグナル伝達 / がん遺伝子 / 点突然変異 / 発がん機序 / リンパ腫
Outline of Research at the Start

B細胞の自然免疫と獲得免疫に必須のシグナル伝達分子であるMYD88とCD79Bのアミノ酸置換変異は、さまざまなリンパ腫で認められ、特にリンパ節外リンパ腫に高頻度で共存する。本研究では申請者のこれまでの研究成果を推し進め、新規作製したCD79B変異マウスを利用して、MYD88L265P変異とCD79BY196H変異がどのように協調的に作用し、B細胞を癌化させるようなシグナルを伝達するのかを解明する。本研究より得られるリンパ腫の発癌機序に関する知見は、B細胞内シグナル伝達に関する理解を前進させるのみならず、MYD88とCD79B変異をもつリンパ腫に対する新規治療法の発見につながる。

Outline of Final Research Achievements

MYD88 and CD79B play critical roles in normal B cell signalling. Mutations in these genes have been found in various types of lymphomas, particularly in high-incidence, intermediate- to high-grade diffuse large B-cell lymphoma. Interestingly, many cases show both mutations simultaneously. In this study, we investigated how these MYD88 and CD79B mutations cooperatively induce B cell dysfunction and B cell malignancy using CD79B mutant mice. CD79B mutants showed higher surface IgM and CD44 in B cells, and biochemical analyses found exaggerated and sustained PI3K activation after B cell antigen receptor stimulation. Gene expression analysis from B cells expressing MYD88 and CD79B mutations upon antigen stimulation identified genes uniquely regulated by these mutations and antigen stimulation. The findings obtained in this study may help discover the mechanisms of lymphoma development and maintenance, as well as novel therapeutic strategies.

Academic Significance and Societal Importance of the Research Achievements

リンパ腫を含むがんのゲノム解析により、多くの遺伝子変異が同定されてきている。その一方、個々の遺伝子変異の機能解析、また複数の遺伝子変異の相互作用の研究はあまり行われていない。本研究で、様々なタイプのリンパ腫で同定され、多くの症例で同時に認められるMYD88とCD79B変異の機能解析を行った。これら2つの変異は、発症例が多く中高悪性度のびまん性大細胞型B細胞リンパ腫で多く見つかり、多くの症例で両者の変異が同時に認められる。本研究で得られた知見は、これらの変異をもつリンパ腫の発生・維持のメカニズム、さらに新規治療法の発見に有用であると考えられる。

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Annual Research Report
  • 2020 Annual Research Report
  • Research Products

    (3 results)

All 2023 Other

All Int'l Joint Research (1 results) Journal Article (2 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 2 results,  Open Access: 1 results)

  • [Int'l Joint Research] The Australian National University/Garvan Institute(オーストラリア)

    • Related Report
      2022 Annual Research Report
  • [Journal Article] Diffuse large B-cell lymphoma and red cell autoimmunity: clinical role and pathogenesis2023

    • Author(s)
      Coombes Caitlin、Horikawa Keisuke、Jain Sanjiv、Jiang Simon、Lim Jun Hee、Saxena Kartik、Shadbolt Bruce、Smyth Lillian、Tobin Joshua、Talaulikar Dipti
    • Journal Title

      Pathology

      Volume: 55 Issue: 1 Pages: 104-112

    • DOI

      10.1016/j.pathol.2022.07.017

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] CARD11 gain-of-function mutation drives cell-autonomous accumulation of PD-1+ ICOShigh activated T cells, T-follicular, T-regulatory and T-follicular regulatory cells2023

    • Author(s)
      Masle-Farquhar Etienne、Jeelall Yogesh、White Jacqueline、Bier Julia、Deenick Elissa K.、Brink Robert、Horikawa Keisuke、Goodnow Christopher Carl
    • Journal Title

      Frontiers in Immunology

      Volume: 14 Pages: 1-11

    • DOI

      10.3389/fimmu.2023.1095257

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research

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Published: 2020-04-28   Modified: 2024-01-30  

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