プラズマ膜の修復は,ライソソームのCa(2+) 調節されたエクソサイトーシスによって媒介されます
A Reddy1, E V Caler, N W Andrews
1Section of Microbial Pathogenesis, Boyer Center for Molecular Medicine, Yale University School of Medicine, New Haven, CT 06520, USA.
Cell
|August 21, 2001
まとめ
リソソームは,カルシウム調節されたエクソサイトーシスによって,血膜の修復を促進する. このプロセスは,膜創傷の治癒に不可欠であり,皮膚線維芽細胞で実証されたように,血膜とのリゾソーム融合を伴う.
科学分野:
- 細胞生物学 細胞生物学
- メンブラン生物学 メンブラン生物学
- 傷の癒し 傷の癒し
背景:
- プラズマ膜の損傷は,細胞の完全性を維持するために迅速な修復を必要とする重要なイベントです.
- カルシウム (Ca2+) 信号伝達は,膜融合イベントを含む細胞プロセスにおいて知られている役割を果たします.
研究 の 目的:
- プラズマ膜障害の修復におけるリゾソーマ外細胞症の役割を調査する.
- リンソソームを含むカルシウム調節された膜修復の基礎にある分子機構を解明する.
主な方法:
- バイオケミカル・セルラー・アッセイを用いて,リソソマエクスオサイトーシスを研究した.
- リコンビナントSyt VII C2Aドメインを含む特定の阻害剤とSyt VIIとLamp-1に対する抗体を使用して,リゾソーム外細胞化を阻害します.
- コラーゲンマトリックス内で培養された傷ついた第一皮膚線維芽細胞の膜再密封を評価した.
主要な成果:
- リンソソームのカルシウム調節されたエクソサイトーシスは,プラズマ膜修復に不可欠であると特定されました.
- Syt VIIまたはLamp-1の操作によるリソソーム外細胞症の抑制により,膜の再密封が損なわれた.
- リソソーム外細胞症は,マトリックス収縮中に傷ついた線維芽細胞の修復を媒介することが示されました.
結論:
- リスゾームは,プラズマ膜修復のための重要なCa2+調節されたエクソサイトコンパートメントとして機能します.
- この研究は,細胞レベルで傷の治癒におけるリゾソームの新たな機能を明らかにしています.
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