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Investigating molecular mechanisms of exocytosis by visualizing single fusion events

Research Project

Project/Area Number 17K19466
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Research Field Neuroscience and related fields
Research InstitutionTokyo Women's Medical University

Principal Investigator

Midorikawa Mitsuharu  東京女子医科大学, 医学部, 准講師 (60632643)

Project Period (FY) 2017-06-30 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Fiscal Year 2018: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2017: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Keywordsシナプス / 開口放出 / イメージング / シナプス小胞
Outline of Final Research Achievements

Exocytosis of synaptic vesicles at neurons is the smallest and the fastest secretion in a body. We tried to clarify molecular mechanisms at the site of single synaptic vesicle exocytosis. We succeeded in visualizing single synaptic vesicle exocytosis by using total internal reflection microscopy at two different presynaptic terminals, calyx of Held terminals in auditory brainstem and mossy fiber boutons in hippocampus. For the molecular manipulation using genetic approaches, we also established direct measurements of exocytosis at lemniscal fiber terminals in somatosensory thalamus.

Academic Significance and Societal Importance of the Research Achievements

分泌機構に異常が生じると精神・運動疾患、糖尿病、アレルギーなどの様々な疾患を引き起こすため、その作用機序を解明することは非常に重要である。中枢神経特有の超高速開口放出を可能にしている分子基盤の実態は未だに不明であり、これを明らかにすることは中枢神経細胞間のシナプス伝達機構を解明する上て重要な基盤情報であるのみならず、脳内の機能異常によって生じる精神・運動疾患を理解するためにも非常に重要である。研究代表者の研究成果は測定が極めて困難である神経細胞における個々のシナプス小胞の開口放出を実測するための手法を進めたものであり、大きな意義がある。

Report

(3 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • Research Products

    (6 results)

All 2019 2018 2017

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

  • [Journal Article] Real-time imaging of synaptic vesicle exocytosis by total internal reflection fluorescence (TIRF) microscopy.2018

    • Author(s)
      Midorikawa M.
    • Journal Title

      Neurosci Res.

      Volume: S0168-0102(17) Pages: 30755-1

    • DOI

      10.1016/j.neures.2018.01.008

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] Kinetics of Releasable Synaptic Vesicles and Their Plastic Changes at Hippocampal Mossy Fiber Synapses.2017

    • Author(s)
      Midorikawa M, Sakaba T.
    • Journal Title

      Neuron

      Volume: 96 Issue: 5 Pages: 1033-1040

    • DOI

      10.1016/j.neuron.2017.10.016

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Presentation] Presynaptic properties at lemniscal fiber terminals in the somatosensory thalamus2019

    • Author(s)
      緑川光春、宮田麻理子
    • Organizer
      第9回アジア・オセアニア生理学会連合 (FAOPS) 2019年大会
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Investigating presynaptic properties of afferent fibers in the somatosensory thalamus.2018

    • Author(s)
      緑川光春、宮田麻理子
    • Organizer
      Core-to-Core program “Nanobiology of neural plasticity based on optical nanoscopy”
    • Related Report
      2018 Annual Research Report
  • [Presentation] Measuring dynamics of releasable synaptic vesicles at hippocampal mossy fiber boutons.2018

    • Author(s)
      緑川光春、坂場武史
    • Organizer
      COLD SPRING HARBOR ASIA CONFERENCES
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Measuring dynamics of releasable synaptic vesicles and their plastic changes at hippocampal mossy fiber boutons.2018

    • Author(s)
      Mitsuharu Midorikawa and Takeshi Sakaba
    • Organizer
      第95回日本生理学会大会
    • Related Report
      2017 Research-status Report

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Published: 2017-07-21   Modified: 2020-03-30  

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