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Hematopoietic stem cell regulation by p38MAPK in aging

Research Project

Project/Area Number 19K17877
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 54010:Hematology and medical oncology-related
Research InstitutionNational Center for Global Health and Medicine

Principal Investigator

Karigane Daiki  国立研究開発法人国立国際医療研究センター, その他部局等, 客員研究員 (60594588)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2021: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2020: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2019: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Keywords造血幹細胞 / 老化 / p38MAPK / ATM / Atm / 慢性炎症
Outline of Research at the Start

加齢に伴い骨髄異形成症候群や急性骨髄性白血病などの有病率が増加する。これは両疾患の発病母地である造血幹細胞の、老化に伴う異常に起因すると考えられている。しかし現状では造血幹細胞の老化については不明な点が多く、解明が急務である。本研究では、これまで造血幹細胞老化における悪玉因子と考えられてきたp38MAPKの、慢性ストレスである老化における役割を明らかにする。

Outline of Final Research Achievements

Hematopoietic stem cells (HSCs) sustain lifetime hematopoiesis. Aging alters HSC function, number, and composition and increases risk of hematological malignancies, but how these changes occur in HSCs remains unclear. Signaling via p38MAPK has been proposed as a candidate mechanism underlying induction of HSC aging. Using genetic models of both chronological and premature aging, we describe a multimodal role for p38a in HSC aging. We report that p38a regulates differentiation bias and sustains the transplantation capacity of HSCs in the early phase of chronological aging. However, p38a decreased HSC transplantation capacity in the late progression phase of chronological aging. Furthermore, co-deletion of p38a in mice deficient in Atm, a model of premature aging, exacerbated aging-related HSC phenotypes seen in Atm single mutant mice. Overall, these studies provide new insight into multiple functions of p38MAPK, which both promote and suppress HSC aging context-dependently.

Academic Significance and Societal Importance of the Research Achievements

現在は高齢化社会であり、血液疾患のみならず、多くの疾患は老化が大きな要因となって発症します。しかし老化とは何か、老化がどのように疾患の進展に影響するかなどは、まだ不明な部分が多く残っています。我々は老化を代表的な慢性ストレスととらえ、生理学的老化および早老症モデルにおける造血幹細胞の機能を解析し、上記問題の解明を試みました。結果、老化は一様ではなく、早期・後期で異なる分子機構が寄与している可能性が示唆されました。また早老症モデルは必ずしも生理学的老化とは同じではなく、異なる機構が存在すると考えられました。

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (1 results)

All 2021

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

  • [Journal Article] p38α plays differential roles in hematopoietic stem cell activity dependent on aging contexts2021

    • Author(s)
      Sorimachi Yuriko、Karigane Daiki、Ootomo Yukako、Kobayashi Hiroshi、Morikawa Takayuki、Otsu Kinya、Kubota Yoshiaki、Okamoto Shinichiro、Goda Nobuhito、Takubo Keiyo
    • Journal Title

      Journal of Biological Chemistry

      Volume: 296 Pages: 100563-100563

    • DOI

      10.1016/j.jbc.2021.100563

    • Related Report
      2021 Annual Research Report 2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research

URL: 

Published: 2019-04-18   Modified: 2023-01-30  

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