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Measuring Axonal Cargo Transport in Mouse Primary Cortical Cultured Neurons
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サイトプラズミックダイネインは,膜臓器細胞のマイナス終端方向のモーターです
T A Schroer1, E R Steuer, M P Sheetz
1Department of Cell Biology and Physiology, Washington University School of Medicine, St. Louis, Missouri 63110.
Cell
|March 24, 1989
まとめ
サイトプラズマのダイネインは,マイクロチューブルに沿ってマイナス端に向かってオーガネルの輸送を推進します. このモータータンパク質が運動性において効果的に機能するためには,追加の細胞分裂因子が必要である.
科学分野:
- 細胞生物学 細胞生物学
- 分子運動機能のモーター機能
- 細胞骨格ダイナミクス
背景:
- 微小管ベースの輸送は,細胞内組織にとって極めて重要です.
- 細胞質ダイネインは,臓器細胞の動きに関与する運動タンパク質です.
研究 の 目的:
- 臓器細胞輸送における細胞質ダイネインの特殊な役割を調査する.
- サイトプラズマのダイネイン媒介の運動性に関する要件を特定する.
主な方法:
- 鶏の胚性線維芽細胞の成分を用いた再構成された in vitro 測定を用いた.
- バイトプラズマのダイネインを無活性化するために,バナデート媒介のUV光分裂を用いた.
- 精製された成分とサイトゾールを用いて微小管のオーガネルの動きを評価した.
主要な成果:
- 高速のサイトゾールは,マイクロチューブルに誘発されたマイナス終端方向のオーガネルの動きを誘導します.
- サイトプラズマのダイネインの不活性化により,この運動性の90%以上は廃止されました.
- 不活性なサイトゾールに浄化された細胞質ダイネインを復元することで,運動性が回復した.
結論:
- サイトプラズマのダイネインは,マイナス・エンド・ディレクションのオーガネル輸送の主なモーターである.
- 細胞質ダイネインが臓器の運動を媒介するために,追加の細胞系因子が不可欠である.
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