分泌されるセマフォリンは,産後の中枢神経系の脊椎の分布と形質変異を制御する
Tracy S Tran1, Maria E Rubio, Roger L Clem
1Solomon H. Snyder Department of Neuroscience, The Johns Hopkins University School of Medicine, Baltimore, Maryland 21205, USA.
Nature
|December 17, 2009
まとめ
分泌されるセマフォリンSema3Fは,中枢神経系 (CNS) の状脊椎の発達とシナプス構造を否定的に調節する. Sema3Fシグナル伝達の喪失は,脊椎の数とサイズを増加させ,シナプス機能と中枢神経系の接続性に影響を及ぼします.
科学分野:
- 神経科学は神経科学である.
- 細胞生物学 細胞生物学
- 発達生物学 発達生物学とは
背景:
- 歯茎のは,哺乳類の中枢神経系 (CNS) のシナプス伝達,統合,可塑性において極めて重要です.
- 脊椎の形状と分布の調節は,適切な神経回路機能に不可欠です.
研究 の 目的:
- デンドリット脊椎の発達とシナプス構造の調節における分泌されるセマフォリンSema3Fの役割を調査する.
- セマフォリン媒介による神経形態の制御に関与する特定のシグナル伝達経路の解明.
主な方法:
- Sema3F,ニューロピリン-2 (Npn-2),プレキシンA3 (PlexA3) のノックアウトマウスモデルを使用した.
- 分離したニューロンと脳断片のex vivo分析を用いたin vitro研究を行いました.
- シナプス活動を評価するために,ミニチュア刺激性ポストシナプス電流 (mEPSC) 周波数を測定した.
主要な成果:
- Sema3Fの欠乏は,歯状回形の粒細胞と皮質層Vのピラミッドニューロンにおける脊椎の数と大きさの増加につながった.
- Sema3Fは解離したニューロンにおける脊髄の喪失を促進し,その欠如は脳のスライスにおけるmEPSCの頻度を増加させた.
- 異なるセマフォリン (Sema3A) とニューロピリン (Npn-1) のシグナル伝達経路により, dendritic arborizationが制御されたが,脊椎形質変異は制御されなかった.
結論:
- Sema3Fは,状脊椎の発達と刺激性シナプス構造の負の調節剤として作用します.
- ニューロピリン (Npn-2 vs. Npn-1) の異なる局所化は,中枢神経系の接続性を制御するセマフォリン特異な機能の基礎となっている.
- 分泌されるセマフォリンは,脊椎形質変異,シナプス形成,およびデンドリト形質の正確な制御を通じて,中枢神経系の接続性をオーケストラします.
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