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Development of preventive and therapeutic methods for cochlear synaptopathy

Research Project

Project/Area Number 19K18792
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 56050:Otorhinolaryngology-related
Research InstitutionTohoku University

Principal Investigator

Suzuki Jun  東北大学, 大学病院, 講師 (80735895)

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: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2019: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
KeywordsCochlear synaptopathy / ミトコンドリア障害 / グルタミン酸毒性 / 抗酸化作用 / 音響性聴覚障害 / 騒音暴露 / Ndufs4 / cochlear synaptopathy / 内有毛細胞 / シナプス / ミトコンドリア / 酸化ストレス
Outline of Research at the Start

Cochlear synaptopathyは内耳の蝸牛に存在する内有毛細胞シナプスの障害であり、通常の聴力検査や組織解析では検出できないが、加齢性難聴の発症を加速し耳鳴症の原因となるとされる。本研究では、実験動物(マウス)を用いてグルタミン酸毒性と酸化ストレスの制御をターゲットとしたcochlear synaptopathyの病態解明および予防法・治療法の開発を目指す。

Outline of Final Research Achievements

Mild noise exposure causing temporary threshold shifts causes an irreversible decrease of inner hair cell synapses (cochlear synaptopathy) and is believed to cause early onset of age-related hearing loss and tinnitus. In this study, we assessed how glutamate toxicity, antioxidants, and mitochondrial dysfunction are involved in the development of noise-induced hearing loss, including cochlear synaptopathy. We established a model mouse of noise-induced cochlear synaptopathy in CBA/CaJ and C57BL/6 mouse strains, representative mouse strains in inner ear research. In experiments using mice with impaired mitochondrial function (Ndufs4 knockout mice), we found that Ndufs4 is broadly expressed in the cochlea, that deletion of Ndufs4 causes deterioration of low-frequency hearing after moderate noise exposure, and that deletion of Ndufs4 does not contribute to the development of cochlear synaptopathy.

Academic Significance and Societal Importance of the Research Achievements

一過性の聴力低下が生じる程度の騒音曝露により、有毛細胞が無傷であっても不可逆的な内有毛細胞シナプスの減少が生じ(cochlear synaptopathy)、加齢性難聴の早期発症や耳鳴症の原因となるとされる。本研究で確立した代表的なマウス系統のシナプス障害モデルは、今後のcochlear synaptopathy研究の基礎となる。またNdufs4の欠失によるミトコンドリア機能低下ではcochlear synaptopathyの発症が促進されないことが示され、cochlear synaptopathyの更なる病態解明の手掛かりになると考えられる。

Report

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

    (13 results)

All 2021 2020 2019 Other

All Int'l Joint Research (5 results) Journal Article (4 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 3 results,  Open Access: 2 results) Presentation (4 results) (of which Int'l Joint Research: 2 results,  Invited: 1 results)

  • [Int'l Joint Research] フロリダ大学(米国)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] ハーバード大学(米国)

    • Related Report
      2020 Research-status Report
  • [Int'l Joint Research] フロリダ大学(米国)

    • Related Report
      2020 Research-status Report
  • [Int'l Joint Research] ハーバード大学(米国)

    • Related Report
      2019 Research-status Report
  • [Int'l Joint Research] フロリダ大学(米国)

    • Related Report
      2019 Research-status Report
  • [Journal Article] 【耳鳴・難聴への効果的アプローチ】Hidden hearing lossとは?2021

    • Author(s)
      鈴木 淳
    • Journal Title

      ENTONI

      Volume: 258 Pages: 56-62

    • Related Report
      2021 Annual Research Report
  • [Journal Article] “Passenger gene” problem in transgenic C57BL/6 mice used in hearing research2019

    • Author(s)
      Suzuki Jun、Inada Hitoshi、Han Chul、Kim Mi-Jung、Kimura Ryuichi、Takata Yusuke、Honkura Yohei、Owada Yuji、Kawase Tetsuaki、Katori Yukio、Someya Shinichi、Osumi Noriko
    • Journal Title

      Neuroscience Research

      Volume: - Pages: 30469-9

    • DOI

      10.1016/j.neures.2019.10.007

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Protection from noise-induced cochlear synaptopathy by virally mediated overexpression of NT32019

    • Author(s)
      Hashimoto Ken、Hickman Tyler T.、Suzuki Jun、Ji Lingchao、Kohrman David C.、Corfas Gabriel、Liberman M. Charles
    • Journal Title

      Scientific Reports

      Volume: 9 Issue: 1 Pages: 15362-15362

    • DOI

      10.1038/s41598-019-51724-6

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Effects of enriched endogenous omega-3 fatty acids on age-related hearing loss in mice2019

    • Author(s)
      Honkura Yohei、Suzuki Jun、Sakayori Nobuyuki、Inada Hitoshi、Kawase Tetsuaki、Katori Yukio、Osumi Noriko
    • Journal Title

      BMC Research Notes

      Volume: 12 Issue: 1 Pages: 768-768

    • DOI

      10.1186/s13104-019-4809-8

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] 「Hidden hearing loss」の病態解明・治療法開発に向けた内耳基礎研究2021

    • Author(s)
      鈴木 淳
    • Organizer
      第31回日本耳科学会総会
    • Related Report
      2021 Annual Research Report
  • [Presentation] “Passenger gene” problem in transgenic C57BL/6 mice used in hearing research2020

    • Author(s)
      Suzuki Jun、Inada Hitoshi、Han Chul、Kim Mi-Jung、Kimura Ryuichi、Takata Yusuke、Honkura Yohei、Owada Yuji、Kawase Tetsuaki、Katori Yukio、Someya Shinichi、Osumi Noriko
    • Organizer
      ARO 2020 第43回米国耳鼻咽喉科研究学会 43rd Annual MidWinter Meeting
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] “Hidden hearing loss” の治療法開発にむけて2019

    • Author(s)
      鈴木 淳
    • Organizer
      第29回 日本耳科学会 総会・学術講演会
    • Related Report
      2019 Research-status Report
    • Invited
  • [Presentation] Hearing Recovery from Deafness Caused by Bromate Intoxication2019

    • Author(s)
      Jun Suzuki, Yoshitaka Takanashi, Atsushi Koyama, Yukio Katori
    • Organizer
      INTERNATIONAL OTOPATHOLOGY SOCIETY MEETING 2019
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research

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

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