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Neuroplasticity of auditory neurons in cochlear damage

Research Project

Project/Area Number 19K24052
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund
Review Section 0906:Surgery related to the biological and sensory functions and related fields
Research InstitutionNational Defense Medical College (2020)
Kitasato University (2019)

Principal Investigator

Takaomi Kurioka  防衛医科大学校(医学教育部医学科進学課程及び専門課程、動物実験施設、共同利用研究施設、病院並びに防衛, 耳鼻咽喉科学, 講師 (30842728)

Project Period (FY) 2019-08-30 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords内耳障害 / シナプス / 髄鞘 / 蝸牛神経 / 難聴 / 脱髄
Outline of Research at the Start

内耳機能は加齢に伴って徐々に低下し、難聴や耳鳴等の聴覚障害を呈することから、近年の超高齢化社会においては、この内耳障害が大きな社会問題となっている。申請者は、内耳障害の病態には有毛細胞死や蝸牛神経のシナプス障害、変性・脱髄が関与していると報告してきたが、蝸牛神経の脱髄や髄鞘化を制御する詳細なメカニズムは未だ解明されていない。
本研究では、蝸牛神経の髄鞘制御メカニズムの解明を目的として、内耳障害後の蝸牛神経の髄鞘変化を定量評価し、内耳障害関連の細胞内シグナル(HDAC活性、FGFシグナル、ERKシグナル)の分析により、髄鞘制御に関わる細胞内シグナルの探索と機能解析を行う。

Outline of Final Research Achievements

We investigated the neuroplasticity of auditory neurons(ANs)in adult mice with conductive hearing loss(CHL). Eight―week―old male mice were bilaterally earplugged for 4 weeks(CHL(+)group)and allowed to survive for a further 4 weeks after removal of the earplugs(CHL(+/-)group). The ABR threshold was sgnificantly elevated across all tested frequencies in the earplugged mice. After removal of the earplugs, the threshold shifts recovered fully. The ABR amplitude significantly decreased and the latency significantly increased for all tested frequencies in the CHL(+)mice. These changes were only partially restored in the CHL(+/-)mice. Auditory deprivation had no significant impact on the survival of the hair cells and ANs. However, the synapses and myelin were significantly damaged, and the neuronal sizes of the ANs were significantly decreased in the CHL(+)mice. These changes also recovered only partially in the CHL(+/-)mice as compared to the CHL(+)mice.

Academic Significance and Societal Importance of the Research Achievements

伝音難聴には真珠腫性中耳炎や慢性中耳炎などがあり,薬物治療や外科的治療が聴力回復に有用と考えられている。薬物治療や外科治療が伝音難聴の治療に有効であることは変わりないものの,長期間の伝音難聴に伴う蝸牛神経への電気刺激の減少は,不可逆的な蝸牛シナプス障害をきたす可能性がある。従って,臨床における伝音難聴においても,長期に放置した場合には蝸牛神経の機能が低下する懸念があることから,早期に外科的治療や補聴器装用で神経活動を維持することが重要であると考える。

Report

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

    (16 results)

All 2021 2020 2019

All Journal Article (7 results) (of which Peer Reviewed: 7 results,  Open Access: 4 results) Presentation (9 results) (of which Int'l Joint Research: 1 results)

  • [Journal Article] Decreasing auditory input induces neurogenesis impairment in the hippocampus2021

    • Author(s)
      Kurioka Takaomi、Mogi Sachiyo、Yamashita Taku
    • Journal Title

      Scientific Reports

      Volume: 11 Issue: 1

    • DOI

      10.1038/s41598-020-80218-z

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Iron deficiency is associated with poor prognosis in idiopathic sudden sensorineural hearing loss2021

    • Author(s)
      Kurioka Takaomi、Mogi Sachiyo、Yamashita Taku
    • Journal Title

      The Journal of Laryngology & Otology

      Volume: - Issue: 6 Pages: 508-512

    • DOI

      10.1017/s0022215121001079

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Activity-Dependent Neurodegeneration and Neuroplasticity of Auditory Neurons Following Conductive Hearing Loss in Adult Mice2020

    • Author(s)
      Kurioka Takaomi、Mogi Sachiyo、Tanaka Manabu、Yamashita Taku
    • Journal Title

      Cellular and Molecular Neurobiology

      Volume: 41 Issue: 1 Pages: 31-42

    • DOI

      10.1007/s10571-020-00829-y

    • Related Report
      2020 Annual Research Report 2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] Transient Conductive Hearing Loss Regulates Cross-Modal VGLUT Expression in the Cochlear Nucleus of C57BL/6 Mice2020

    • Author(s)
      Kurioka Takaomi、Mogi Sachiyo、Yamashita Taku
    • Journal Title

      Brain Sciences

      Volume: 10 Issue: 5 Pages: 260-260

    • DOI

      10.3390/brainsci10050260

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Speech discrimination impairment of the worse-hearing ear in asymmetric hearing loss2020

    • Author(s)
      Kurioka Takaomi、Sano Hajime、Furuki Shogo、Yamashita Taku
    • Journal Title

      International Journal of Audiology

      Volume: 60 Issue: 1 Pages: 54-59

    • DOI

      10.1080/14992027.2020.1795282

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Long-term administration of vitamin B12 and adenosine triphosphate for idiopathic sudden sensorineural hearing loss: a retrospective study2020

    • Author(s)
      Kurioka Takaomi、Sano Hajime、Furuki Shogo、Yamashita Taku
    • Journal Title

      PeerJ

      Volume: 8 Pages: e10406-e10406

    • DOI

      10.7717/peerj.10406

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Effects of the Conductive Component of Hearing Loss on Speech Discrimination Ability2020

    • Author(s)
      Takaomi Kurioka, Hajime Sano, Shogo Furuki, Taku Yamashita
    • Journal Title

      The Journal of International Advanced Otology

      Volume: 16 Issue: 1 Pages: 93-97

    • DOI

      10.5152/iao.2020.7870

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] 左右非対称性難聴における悪聴耳の語音聴取能低下について2020

    • Author(s)
      栗岡隆臣
    • Organizer
      第40回日本耳科学会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 伝音難聴が蝸牛神経に及ぼす影響と神経可塑性について2020

    • Author(s)
      栗岡隆臣
    • Organizer
      第65回日本聴覚医学会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 難聴が海馬の神経新生に及ぼす影響について2020

    • Author(s)
      栗岡隆臣
    • Organizer
      第121回日本耳鼻咽喉科学会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Activity-dependent Synaptopathy and Demyelination of Auditory Neurons following Conductive Hearing Loss in Adult Mice2020

    • Author(s)
      Takaomi Kurioka
    • Organizer
      Association for Research in Otolaryngology 43rd Annual Midwinter Meeting
    • Related Report
      2020 Annual Research Report
  • [Presentation] 音響性聴覚障害における 蝸牛神経と海馬の障害メカニズムについて2020

    • Author(s)
      栗岡隆臣
    • Organizer
      第40回日本耳科学会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Activity-dependent Synaptopathy and Demyelination of Auditory Neurons following Conductive Hearing Loss in Adult Mice2020

    • Author(s)
      Takaomi Kurioka
    • Organizer
      43th annual meeting of association for Research in Otolaryngology, 2020, San Jose, USA
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] 伝音難聴が内耳に及ぼす影響について2019

    • Author(s)
      栗岡隆臣
    • Organizer
      第37回耳鼻咽喉科ニューロサイエンス 研究会
    • Related Report
      2019 Research-status Report
  • [Presentation] 混合難聴の伝音成分が語音明瞭度に与える影響について2019

    • Author(s)
      栗岡隆臣
    • Organizer
      第29回日本耳科学会
    • Related Report
      2019 Research-status Report
  • [Presentation] 難聴の基礎と臨床~伝音難聴による聴覚障害とその病態解明~2019

    • Author(s)
      栗岡隆臣
    • Organizer
      神奈川県耳鼻咽喉科セミナー, 2019
    • Related Report
      2019 Research-status Report

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Published: 2019-09-03   Modified: 2022-01-27  

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