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Functional analysis of delta receptors in outer hair cells

Research Project

Project/Area Number 16K11174
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Otorhinolaryngology
Research InstitutionTokyo Medical and Dental University

Principal Investigator

FUJIKAWA Taro  東京医科歯科大学, 大学院医歯学総合研究科, 助教 (60401402)

Co-Investigator(Kenkyū-buntansha) 川島 慶之  東京医科歯科大学, 大学院医歯学総合研究科, 准教授 (10376759)
Project Period (FY) 2016-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2018: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2017: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2016: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Keywords加齢性難聴 / グルタミン酸受容体 / デルタ型受容体 / 有毛細胞シナプス / 機能代償 / Cbln1 / 透過型電子顕微鏡 / デルタ受容体 / 高音障害型難聴 / 神経科学
Outline of Final Research Achievements

We used GluD1 knock-out mice to analyze the role of delta receptors in the inner ear. Delta receptors were highly expressed in cochlear and vestibular mice tissues. GluD1 knock-out mice showed progressive hearing loss that started in high frequencies at 5 months of age and spread to lower frequencies, which was associated with the decreased number of efferent synapses of outer hair cells. These results indicate that delta receptors play an important role in formation and maintenance of hair cells synapses in the cochlea.

Academic Significance and Societal Importance of the Research Achievements

近年、デルタ型受容体が様々な神経変性疾患との関連が報告されている。本研究の成果は、デルタ型受容体が蝸牛有毛細胞のシナプスの形成と維持に重要なはたらきを有することを示す。デルタ型受容体の機能異常が難聴や平衡障害の新たな病態モデルとなる可能性がある。
またデルタ型受容体によるシナプス形成は成体においても可逆的でレスキューができるので、加齢性難聴や進行性平衡障害などに対する遺伝子治療や薬物治療のターゲットとしても有望であることから将来性があり、創造的であり画期的な研究成果になる可能性が高い。

Report

(5 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (5 results)

All 2020 2019

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

  • [Journal Article] Middle Ear Risk Index (MERI)とOssiculoplasty Outcome Parameter Staging (OOPS) Indexを用いた内視鏡下鼓室形成術の術後聴力予測について2020

    • Author(s)
      藤川太郎、川島慶之、伊藤卓、本田圭司、竹田貴策、堤剛
    • Journal Title

      Otology Japan

      Volume: 30 Pages: 122-126

    • NAID

      130007948839

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] A Case of Eosinophilic Granulomatosis with Polyangiitis Associated with Posterior Auricular Arteritis2019

    • Author(s)
      藤川 太郎、大庭 聖也、川島 慶之、真壁 彩音、伊藤 卓、竹田 貴策、堤 剛
    • Journal Title

      Otology Japan

      Volume: 29 Issue: 1 Pages: 45-51

    • DOI

      10.11289/otoljpn.29.45

    • NAID

      130007695452

    • ISSN
      0917-2025, 1884-1457
    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] GluD1 Deficiency Causes Progressive High-frequency Hearing Loss and Insufficient Efferent Synapse Formation on Outer Hair Cells2019

    • Author(s)
      Takamori Takeda, Taro Fujikawa, Yuriko Sakamaki, Masato Fujioka, Yoshiyuki Kawashima, Taku Ito, Ayane Makabe, Takeshi Tsutsumi, Michisuke Yuzaki
    • Organizer
      2019 ARO MidWinter Meeting
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Correlation of Micro CT and Histopathology in SLC26A4-Null Mice Unveils the Cochlear Pathogenesis of Incomplete Partition Type II2019

    • Author(s)
      Taku Ito, Taro Fujikawa, Ayane Makabe, Keiji Honda, Yoshiyuki Kawashima, Takeshi 堤、Andrew Griffith
    • Organizer
      2019 ARO MidWinter Meeting
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] GluD1 Deficiency Causes Progressive High-frequency Hearing Loss and Insufficient Efferent Synapse Formation on Outer Hair Cells2019

    • Author(s)
      Takamori Takeda, Taro Fujikawa, Yuriko Sakamaki, Masato Fujioka, Yoshiyuki Kawashima, Taku Ito, Ayane Makabe, Takeshi Tsutsumi, Michisuke Yuzaki
    • Organizer
      Association for Research in Otolaryngology, 42nd Annual MidWinter Meeting
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research

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Published: 2016-04-21   Modified: 2021-02-19  

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