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Establishment of treatment for acute ischemic stroke focusing on TRPV4

Research Project

Project/Area Number 19K21303
Project/Area Number (Other) 18H06198 (2018)
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund (2019)
Single-year Grants (2018)
Review Section 0902:General internal medicine and related fields
Research InstitutionKyushu University

Principal Investigator

Tanaka Koji  九州大学, 大学病院, 医員 (50722344)

Project Period (FY) 2018-08-24 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2018: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
KeywordsTRPV4 / ノックアウトマウス / 脳梗塞 / アストロサイト / 脳浮腫 / 脳血管障害 / 浮腫
Outline of Research at the Start

虚血性脳血管障害の急性期には血液脳関門を構成するアストロサイトの足突起の浮腫が生じ、次第に細胞性浮腫、血管性浮腫に移行する。アストロサイトの浮腫には足突起にAQP4水チャネルとともに共発現している陽イオンチャネルであるTRPV4が関与している。
TRPV4を標的とした急性期虚血性脳血管障害の治療法の開発のため、本研究ではTPRV4阻害薬を用いたマウス脳梗塞モデル、培養細胞での血液脳関門構築モデルを用いた実験を行う。

Outline of Final Research Achievements

In the acute phase of ischemia-reperfusion, hypoperfusion associated with ischemia and reperfusion in microvascular regions and disruption of the blood brain barrier (BBB) contribute to post-ischemic brain injury. We aimed to clarify whether brain injury following transient middle cerebral artery occlusion (tMCAO) is ameliorated in Transient Receptor Potential Vanilloid 4 (TRPV4) knockout (Trpv4-/-) mice.
Compared with WT mice, Trpv4-/- mice showed reduced ischemia-induced lesion volume and reduced water content and Evans blue leakage in the ipsilateral hemisphere alongside milder neurological symptoms after the tMCAO. The loss of zonula occludens-1 and occludin proteins in the ipsilateral hemisphere after the tMCAO was attenuated in Trpv4-/- mice. Transmission electron microscopy revealed that parenchymal microvessels in the ischemic lesion were compressed and narrowed by the swollen endfeet of astrocytes in WT mice, but these effects were markedly ameliorated in Trpv4-/- mice.

Academic Significance and Societal Importance of the Research Achievements

本研究結果から、急性期にTransient Receptor Potential Vanilloid 4 (TRPV4)を抑制することは再灌流直後のアストロサイト足突起の浮腫を軽減しblood brain barrierを保持することで脳保護的に働くと推察された。
主幹動脈閉塞を伴う急性期脳梗塞に対する急性期再開通療法の進歩が著しい近年において、虚血再灌流後の脳損傷に対する脳保護効果を示した本研究結果の意義は大きいと考えられる。

Report

(3 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Annual Research 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) (of which Int'l Joint Research: 1 results)

  • [Journal Article] Modified diffusion-weighted imaging-Alberta Stroke Program Early Computed Tomography Score including deep white matter lesions predicts symptomatic intracerebral hemorrhage following intravenous thrombolysis.2020

    • Author(s)
      Tanaka K, Matsumoto S, Furuta K, Yamada T, Nagano S, Takase KI, Hatano T, Yamasaki R, Kira JI.
    • Journal Title

      J Thromb Thrombolysis.

      Volume: 49 Issue: 4 Pages: 545-550

    • DOI

      10.1007/s11239-019-02015-4

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Reduced post-ischemic brain injury following transient focal cerebral ischemia in Transient receptor potential vanilloid 4 knockout mice2020

    • Author(s)
      Tanaka K, Matsumoto S, Yamada T, Yamasaki R, Suzuki M, Kido AM, Kira JI
    • Journal Title

      Front Neurosci

      Volume: 14 Pages: 453-453

    • DOI

      10.3389/fnins.2020.00453

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Temporal trends in clinical characteristics and door-to-needle time in patients receiving intravenous tissue plasminogen activator: a retrospective study of four hospitals in Japan2019

    • Author(s)
      Tanaka K, et al.
    • Journal Title

      J Stroke and Cerebrovascular Dis

      Volume: 28 Issue: 11 Pages: 104305-104305

    • DOI

      10.1016/j.jstrokecerebrovasdis.2019.104305

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Modified diffusion-weighted imaging-Alberta Stroke Program Early Computed Tomography Score including deep white matter lesions predicts symptomatic intracerebral hemorrhage following intravenous thrombolysis.2019

    • Author(s)
      Tanaka K, Matsumoto S, Furuta K, Yamada T, Nagano S, Takase KI, Hatano T, Yamasaki R, Kira JI.
    • Journal Title

      J Thromb Thrombolysis

      Volume: in press Issue: 1 Pages: 0-0

    • DOI

      10.1007/s11239-019-01979-7

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] Reduced post-ischemic brain injury following transient focal cerebral ischemia in Transient receptor potential vanilloid 4 knockout mice2020

    • Author(s)
      Tanaka K, Matsumoto S, Yamada T, Yamasaki R, Kido M, Kira JI
    • Organizer
      International Stroke Conference 2020
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research

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Published: 2018-08-27   Modified: 2024-03-26  

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