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Mechanism for the roles of cholesterol-binding membrane protein TSPO2 in terminal erythroid differentiation

Research Project

Project/Area Number 20H03138
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 42020:Veterinary medical science-related
Research InstitutionHokkaido University

Principal Investigator

Inaba Mutsumi  北海道大学, 獣医学研究院, 教授 (00183179)

Co-Investigator(Kenkyū-buntansha) 高田 健介  北海道大学, 獣医学研究院, 准教授 (40570073)
Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥18,070,000 (Direct Cost: ¥13,900,000、Indirect Cost: ¥4,170,000)
Fiscal Year 2022: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2021: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2020: ¥9,230,000 (Direct Cost: ¥7,100,000、Indirect Cost: ¥2,130,000)
Keywords赤芽球造血 / 赤血球 / 赤芽球 / コレステロール / コレステロール結合蛋白質 / 貧血 / 赤芽球系造血 / コレステロール結合タンパク質 / 終末分化
Outline of Research at the Start

赤芽球の終末分化ではコレステロールが重要とされるが、その仕組みには今なお謎が多い。代表者らは、コレステロール結合膜蛋白質TSPO2の遺伝子変異/欠失が赤芽球の細胞質分裂・細胞周期の遅延、細胞死と成熟不全、コレステロールの細胞内動態低下を生じることを明らかにした。この知見に基づき、本研究ではTSPO2がどのように細胞内コレステロール動態を調節して赤芽球造血の恒常性を担い大量の赤血球生産を可能にしているのか、マウス生体とマウス赤芽球系培養細胞を用いて、その仕組みを明らかにする。

Outline of Final Research Achievements

The roles of TSPO2, a transmembrane cholesterol-binding protein expressed in late erythroblasts, were examined using Tspo2 knockout mouse models. Bone marrow-derived TSPO2-deficient erythroid cells, as well as Tspo2-knockout MEDEP cells, showed impaired cytokinesis and morphological defects associated with a cell-cycle arrest, resulting in decreased cell proliferation and delays in erythroid maturation with a consequent reduction in red cell production. TSPO2-deficient erythroid cells exhibited an increased release of incorporated cholesterol. The expression of HA-tagged TSPO2 that found in the Golgi apparatus and lysosomes, by transient expression and gene editing, rescued such defects, whereas the supplementation of exogenous cholesterol had no effect. These findings imply that TSPO2 is essential for coordination of maturation and proliferation of erythroblasts during normal erythropoiesis and that TSPO2 regulates intracellular distribution of cholesterol in late erythroblasts.

Academic Significance and Societal Importance of the Research Achievements

近年、貧血患者における低コレステロール血症やコレステロール過剰と赤血球産生異常の関係など、赤芽球系造血におけるコレステロール代謝の重要性が報告されているが、赤血球産生過程でコレステロールがどのように関わるのか、その機作や実態は不明である。本研究成果は、TSPO2という膜タンパク質が赤芽球の細胞内コレステロールを制御して赤芽球系終末分化における生理的な細胞増殖と成熟を支え、効率的な赤血球生産を可能にすることを示したものであり、生理的赤血球産生機序の解明、貧血等疾患の的確な診断・治療、人口赤血球産生の効率化、さらにコレステロールに関する適正な医療情報等に大きな学術的・社会的意義を有する。

Report

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

    (11 results)

All 2023 2022 2020 Other

All Int'l Joint Research (3 results) Journal Article (4 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 4 results,  Open Access: 3 results) Presentation (1 results) (of which Int'l Joint Research: 1 results,  Invited: 1 results) Remarks (3 results)

  • [Int'l Joint Research] New York Blood Center(米国)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] New York Blood Center(米国)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] New York Blood Center(米国)

    • Related Report
      2020 Annual Research Report
  • [Journal Article] Membrane skeleton hyperstability due to a novel alternatively spliced 4.1R can account for ellipsoidal camelid red cells with decreased deformability2023

    • Author(s)
      Chen Yuqi、Miyazono Kosuke、Otsuka Yayoi、Kanamori Mariko、Yamashita Aozora、Arashiki Nobuto、Matsumoto Takehisa、Takada Kensuke、Sato Kota、Mohandas Narla、Inaba Mutsumi
    • Journal Title

      Journal of Biological Chemistry

      Volume: 299 Issue: 2 Pages: 102877-102877

    • DOI

      10.1016/j.jbc.2023.102877

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Erythrocyte membrane defects2022

    • Author(s)
      Mutsumi Inaba and Jane B. Messick
    • Journal Title

      Schalm's Veterinary Hematology, 7th ed. (Brooks, M. B., Harr, K. E., Seelig, D. M., Wardrop, K. J., and Weiss, D. J. eds.)

      Volume: 7 Pages: 238-247

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Cholesterol-binding protein TSPO2 coordinates maturation and proliferation of terminally differentiating erythroblasts2020

    • Author(s)
      Kiatpakdee Benjaporn、Sato Kota、Otsuka Yayoi、Arashiki Nobuto、Chen Yuqi、Tsumita Takuya、Otsu Wataru、Yamamoto Akito、Kawata Reo、Yamazaki Jumpei、Sugimoto Yoshikazu、Takada Kensuke、Mohandas Narla、Inaba Mutsumi
    • Journal Title

      Journal of Biological Chemistry

      Volume: 295 Issue: 23 Pages: 8048-8063

    • DOI

      10.1074/jbc.ra119.011679

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] ROR agonist hampers the proliferation and survival of postactivated CD8+ T cells through the downregulation of cholesterol synthesis‐related genes2020

    • Author(s)
      Cai Zimeng、Ishibashi Taishin、Kozai Mina、Mita Hironobu、Wang Shangyi、Takada Kensuke、Inaba Mutsumi
    • Journal Title

      Immunology & Cell Biology

      Volume: 99 Issue: 3 Pages: 288-298

    • DOI

      10.1111/imcb.12406

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] TSPO2 coordinates maturation and proliferation of terminally differentiating erythroblasts2020

    • Author(s)
      Benjaporn Kiatpakdee, Kota Sato, Yayoi Otsuka, Nobuto Arashiki, Yuqi Chen, Takuya Tsumita, Wataru Otsu, Akito Yamamoto, Reo Kawata, Yoshikazu Sugimoto, Kensuke Takada1, Narla Mohandas, Mutsumi Inaba
    • Organizer
      2020 “Virtual” Red Cell Club Meeting
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research / Invited
  • [Remarks] 北海道大学大学院獣医学研究院・動物分子医学教室

    • URL

      https://bunshi.vetmed.hokudai.ac.jp/research.html

    • Related Report
      2022 Annual Research Report
  • [Remarks] 動物分子医学教室

    • URL

      https://bunshi.vetmed.hokudai.ac.jp/publication.html

    • Related Report
      2021 Annual Research Report
  • [Remarks] 北海道大学大学院獣医学研究院動物分子医学教室

    • URL

      http://www.vetmed.hokudai.ac.jp/organization/lmm/index.html

    • Related Report
      2020 Annual Research Report

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

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