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シナプトタグミン7は,特殊な抑うつシナプスに周波数インヴァリアンスを与える
Josef Turecek1, Skyler L Jackman1, Wade G Regehr1
11Department of Neurobiology, Harvard Medical School, 220 Longwood Avenue, Boston, Massachusetts 02115, USA.
Nature
|November 2, 2017
まとめ
シナプトタグミン7 (Syt7) は,マスク促進により,シナプスを抑える時に周波数不変の伝播を可能にします. このメカニズムは 脳内の様々な発射周波数で 効率的な神経計算を可能にします
科学分野:
- 神経科学
- シナプスの可塑性
- 分子生物学
背景:
- ほとんどの脳シナプスは 短期的な可塑性を示し 発射頻度に応じて 動的に強さを調整します
- 周波数依存のシナプスの変化は 感覚適応と神経計算に不可欠です
- 聴覚,前頭葉,小脳などのシナプスは 持続的な強さを保ち,シナプスの非線形性にもかかわらず 発射速度を効率的にコードします
研究 の 目的:
- Purkinje細胞から深層小脳核と前頭葉シナプスへの周波数不変伝達機構を調査する.
- シナプトタグミン7 (Syt7) の作用を,全体的な低下を示すシナプスで決定する.
主な方法:
- マウスのPurkinje細胞から深層の小脳核と前立腺のシナプスを研究した.
- 野生型とSyt7ノックアウトマウスを用いてシナプトタグミン7 (Syt7) の作用を調査した.
- 機能を確認するためにSyt7発現のシナプス前救出を行った.
主要な成果:
- プルキンジュ細胞と前立腺のシナプスは,初期に抑うつ状態になり,その後は周波数不変の安定状態反応を示します.
- シナプトタグミン7 (Syt7) は,通常マスクされた促進をサポートし,うつ状態を逆行させ,野生型のマウスの周波数不変につながります.
- Syt7のノックアウトマウスは従来の使用依存性うつ病を示し,シナプスはより高い周波数で弱まります.
結論:
- シナプトタグミン7 (Syt7) は,全体的な抑うつを示すシナプスにおいて重要な役割を果たし,新しい機能を明らかにします.
- Syt7によってサポートされるファシリテーションは,周波数不変のシナプス伝達を実現するために,予期せぬ抑止作用をします.
- このメカニズムは 特定の脳回路の 効率的な神経コーディングに不可欠です
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