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Abberent mitochondrial metabolism as a cause of salt-sensitive hypertension

Research Project

Project/Area Number 21K08234
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 53040:Nephrology-related
Research InstitutionInternational University of Health and Welfare

Principal Investigator

Shimosawa Tatsuo  国際医療福祉大学, 医学部, 教授 (90231365)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2023: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2022: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2021: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Keywords血圧日内変動 / ナトリウムチャネル / ミトコンドリア / 低酸素 / 糖 / 高血圧 / ナトリウム / 間欠的低酸素 / 食塩 / エネルギー代謝 / 腎臓 / 酸化ストレス
Outline of Research at the Start

食塩感受性高血圧症は予後不良の病態である。それゆえ、食塩感受性高血圧の発症予防方法の検討が必要である。我々は腎臓のナトリウム―クロール共輸送体(NCC)の異常が食塩感受性高血圧に関与し、その異常がエピゲノム変化、酸化ストレス増大によることを報告した。しかし、臨床的には遠位尿細管での酸化ストレス増大メカニズムは不明である。本研究では遠位尿細管においてはミトコンドリアを用いたエネルギー代謝が盛んであることに着目し、遠位尿細管のミトコンドリア機能が、不適切な酸化ストレスの産生とそれに伴うNCCの活性化与える影響を検証する。本研究成果は食塩感受性高血圧の発症予防の新たなアプローチの開発に寄与する。

Outline of Final Research Achievements

In the current study, we investigated the impact of hypoxia and high glucose on NCC activation in mDCT cells. Hypoxia induced mitochondrial oxidative stress and activated NCC by increases in its phosphorylation, however, under high glucose, NCC was inactivated. Mito-TEMPO which eliminates mitochondrial oxidative stress reduced NCC activation.
In vivo experiments revealed that intermittent hypoxia activated NCC in the kidney and induced sustained high blood pressure during the sleeping time of mice. When NCC is genetically deleted, the nocturnal blood pressure declined under intermittent hypoxic conditions.

Academic Significance and Societal Importance of the Research Achievements

ミトコンドリア機能は腎臓におけるナトリウム再吸収に重要な働きをもち、特に血圧日内変動に影響することが明らかとなった。睡眠時無呼吸症候群ではミトコンドリア由来の酸化ストレスがナトリウムチャネル機能に影響をあたえ、高血圧発症のリスクとなる可能性が考えられる。
一方、尿糖はミトコンドリア機能に悪影響を与えず、ナトリウム再吸収も抑制することが示された。糖尿病の治療において、尿中糖排泄を増加させることは高血圧発症を予防する可能性が考えられる。

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (7 results)

All 2023 2022 2021

All Journal Article (3 results) (of which Peer Reviewed: 3 results,  Open Access: 1 results) Presentation (4 results) (of which Int'l Joint Research: 2 results,  Invited: 4 results)

  • [Journal Article] How animal models can be utilized to find new biomarkers for cardiovascular diseases2023

    • Author(s)
      Shimosawa T
    • Journal Title

      Clinical Science

      Volume: 137 Issue: 6 Pages: 527-535

    • DOI

      10.1042/cs20220832

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Quality is not an act, it is a habitーAristotle.2023

    • Author(s)
      Shimosawa T
    • Journal Title

      Hypertension Research

      Volume: - Issue: 5 Pages: 1221-1226

    • DOI

      10.1038/s41440-023-01234-w

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Evaluation of the pathophysiological mechanisms of salt sensitivity2021

    • Author(s)
      Conghui Wang, Tatsuo Shimosawa
    • Journal Title

      J Exp Nephrol

      Volume: 2 Issue: 1 Pages: 21-24

    • DOI

      10.46439/nephrology.2.010

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Salting a bird’s tail2022

    • Author(s)
      Shimosawa T
    • Organizer
      20th International Society of Hypertension
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Biomarcadores Urinarios para Enfermedades No Transmisibles / Urinary Biomarkers for Non-communicable Diseases2022

    • Author(s)
      Shimosawa T
    • Organizer
      The XXXI World Congress of the World Association of Societies of Pathology and Laboratory Medicine
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 内分泌的視点から見た本態性高血圧病態2021

    • Author(s)
      下澤達雄
    • Organizer
      第94回日本内分泌学会学術集会
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] Hypertension and related diseases in the era of COVID-192021

    • Author(s)
      Tatsuo Shimosawa
    • Organizer
      Kazakhstan Society of Medicine
    • Related Report
      2021 Research-status Report
    • Invited

URL: 

Published: 2021-04-28   Modified: 2025-01-30  

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