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Mechanism of intraocular pressure control by mechanosensors

Research Project

Project/Area Number 18K16946
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 56060:Ophthalmology-related
Research InstitutionThe University of Tokyo

Principal Investigator

Kimura-Yamagishi Reiko  東京大学, 医学部附属病院, 特任助教 (80704642)

Project Period (FY) 2018-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2020: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2019: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2018: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Keywordsメカノセンサー / 緑内障 / 眼圧 / ヒト線維柱帯細胞 / 遺伝子改変マウス / 房水 / 線維柱帯細胞 / TRPV4 / Piezo1 / 圧受容体 / 眼圧制御
Outline of Final Research Achievements

We investigated the effects of PIEZO1 and TRPV4 against intraocular pressure (IOP) by human trabecular meshwork cells (HTM). In this study, we revealed that PIEZO1 and TRPV4 were involved in [Ca2+] influx and arachidonic acid and PGE2 production by stretch stimulation, TRPV4 or Piezo1 agonist treatment.
In addition, we measured IOP in TRPV4 KO and wild-type (WT) mice, the IOP of TRPV4 KO mice was higher than that of WT mice. Furthermore, TRPV4 agonist was lowered IOP in WT mice. On the other hand, the outflow facility of TRPV4 KO mice was lowered than that of WT mice. These findings suggest that Piezo1 and TRPV4 may be involved in IOP regulation.

Academic Significance and Societal Importance of the Research Achievements

未だ不明な点が多い眼圧制御メカニズムを解明することは、緑内障により失明してしまう患者を救うために必須である。本研究で着目したメカノセンサーであるTRPV4やPiezo1は圧力、伸展、温度など物理的刺激に対して反応することが知られている。そして眼圧という圧力と緑内障は深く関わることが知られているが、眼圧をどのように制御し、眼圧をどのように感知し機能的変化を及ぼすかについてはよくわかっていない。本研究により、TRPV4やPiezo1が物理的刺激を受けた際、アラキドン酸やPGE2産生を介して、眼圧を下げる方向へ働くことが明らかにされた。このことは、眼圧制御メカニズム解明の大きな一歩なると考えている。

Report

(6 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (3 results)

All 2023 2021

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

  • [Journal Article] TRPV4 is activated by mechanical stimulation to induce prostaglandins release in trabecular meshwork, lowering intraocular pressure2021

    • Author(s)
      Uchida Takatoshi、Shimizu Shota、Yamagishi Reiko、Tokuoka Suzumi M.、Kita Yoshihiro、Sakata Rei、Honjo Megumi、Aihara Makoto
    • Journal Title

      PLOS ONE

      Volume: 16 Issue: 10 Pages: 0258911-0258911

    • DOI

      10.1371/journal.pone.0258911

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Mechanical stretch induces Ca2+ influx and extracellular release of PGE2 through Piezo1 activation in trabecular meshwork cells2021

    • Author(s)
      Uchida Takatoshi、Shimizu Shota、Yamagishi Reiko、Tokuoka Suzumi M.、Kita Yoshihiro、Honjo Megumi、Aihara Makoto
    • Journal Title

      Scientific Reports

      Volume: 11 Issue: 1 Pages: 4044-4044

    • DOI

      10.1038/s41598-021-83713-z

    • Related Report
      2021 Research-status Report 2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] The effect of TRPV4 against the change of fibrosis-related factors in trabecular meshwork cells under pressure stress.2023

    • Author(s)
      Reiko Yamagishi-Kimura, Megumi Honjo, Makoto Aihara
    • Organizer
      the XXVth biennial meeting of the International Society of Eye Research (ISER)
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research

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Published: 2018-04-23   Modified: 2024-01-30  

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