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胞の年齢に応じて,分泌性胞のプールの機能的および空間的分離
Rory R Duncan1, Jennifer Greaves, Ulrich K Wiegand
1Membrane Biology Group, University of Edinburgh, George Square, Edinburgh EH8 9XD, UK.
Nature
|March 14, 2003
まとめ
排泄小胞は,エクソサイトーシスのためにランダムに募集されません. 新しい膀はプラズマ膜にドッキングし,古い膀は移動性サイトプラズマプールを形成し,両プールからセレクタゴーグが選択的に放出されます.
科学分野:
- 細胞生物学 細胞生物学
- 神経内分泌学の神経内分泌学
- バイオケミストリー バイオケミストリー
背景:
- シナプス端末と神経内分泌細胞は,エクソサイトーシスのための分泌胞子を利用します.
- 膀の小さな容易に放出可能なプール (RRP) は,プラズマ膜にドッキングされ,より大きな予備プールが細胞質に存在する.
- RRPへの膀の採用を優先するメカニズムは,現在不明です.
研究 の 目的:
- 牛の副腎クロマフィン細胞における分泌小胞の年齢依存的分離と徴募を調査する.
- 膀の年齢が,その空間的分布とエクソサイトーシスのアクセシビリティに影響するかどうかを判断する.
主な方法:
- 胞の年齢を追跡するために,時間とともに色を変える光貨物タンパク質を使用しました.
- 牛の副腎クロマフィン細胞における観察された膀の行動と分布.
- 選択的な膀の放出を評価するために,異なる分泌剤を適用しました.
主要な成果:
- 膀は,年齢によって異なる集団に分離されます.
- 新しく組み立てられた膀は不動で,プラズマ膜にドッキングされています.
- 古い膀は移動し,細胞質の奥深くに位置する.
- セクレタゴグは,RRPまたはより深い細胞質プールから選択的に膀を放出します.
結論:
- エキゾシトーシスのための膀の募集はランダムではなく,膀の年齢に影響されます.
- 膀は,年齢に応じて機能的,空間的に分離され,放出ダイナミクスに影響を与えます.
- この年齢に基づく分離は,エクソサイトーシスを調節するための新しいメカニズムを提供します.
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