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Long-term potentiation, or LTP, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTP is the process of synaptic strengthening that occurs over time between pre and postsynaptic neuronal connections. The synaptic strengthening of LTP works in opposition to the synaptic weakening of long-term depression (LTD) and together are the main mechanisms that underlie learning and memory.
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マイクログリアは,脳由来神経栄養因子を通して,学習依存のシナプス形成を促進します.

Christopher N Parkhurst1, Guang Yang2, Ipe Ninan3

  • 1Molecular Neurobiology Program, The Kimmel Center for Biology and Medicine at the Skirball Institute, Department of Neuroscience and Physiology, New York University School of Medicine, New York, NY 10016, USA.

Cell
|December 24, 2013
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まとめ

脳の免疫細胞であるマイクログリアは,学習と記憶に不可欠です. この研究は,認知機能に不可欠な脳由来神経栄養因子 (BDNF) を介してシナプス形成を促進することを示しています.

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科学分野:

  • 神経科学は神経科学である.
  • 免疫学 免疫学とは
  • 細胞生物学 細胞生物学

背景:

  • マイクログリアは,病理学における既知の役割を持つ中枢神経系のマクロファージである.
  • 脳の可塑性や認知におけるそれらの生理学的機能は十分に理解されていません.

研究 の 目的:

  • 学習,記憶,シナプス可塑性におけるマイクログリアの生理学的役割を調査する.
  • 中枢神経系における特定のマイクログリアル操作のための方法を開発する.

主な方法:

  • マイクログリアにおける誘導可能な遺伝子操作のためのCX3CR1 ((CreER)) マウスを生成した.
  • ディフテリア毒素を投与した貧弱化したマイクログリア.
  • 学習,記憶,シナプス形成を評価した. 枯渇したマウスのシナプス形成.
  • 遺伝子除去によるマイクログリアル脳由来神経栄養因子 (BDNF) の役割を調べました.

主要な成果:

  • マイクログリアの枯渇は学習を阻害し,モーター学習に依存したシナプス形成.
  • マイクログリアBDNFの遺伝的除去は,マイクログリア枯渇の効果を模倣した.
  • マイクログリアルBDNFは,シナプス可塑性における重要な要因であるニューロンのトロポミオシン関連キナーゼ受容体Bのリン酸化を高めます.

結論:

  • マイクログリアは,学習と記憶において重要な生理学的役割を果たします.
  • マイクログリアは,BDNFシグナル伝達を通じて,学習に関連するシナプス形成を促進します.
  • マイクログリアルBDNFをターゲットにすると,認知障害の治療の可能性が生まれます.