エピセルの三細胞結合は,ミトーシスを指向するインターフェーズ細胞形状センサとして機能する
Floris Bosveld1, Olga Markova1, Boris Guirao1
1Polarity, Division and Morphogenesis Team, Institut Curie, CNRS UMR 3215, INSERM U934, 26 rue d'Ulm, 75248 Paris Cedex 05, France.
Nature
|February 18, 2016
まとめ
ドロソフィラエピテリアの三細胞結合 (TCJ) は,インターフェーズ細胞の形を感知することによって細胞分裂を誘導する. 細胞がミトーシス中に丸め上げられる時でさえも これらの交差点は極性指針として作用し 分裂の方向性を導きます
科学分野:
- 細胞生物学
- 発達生物学
- バイオ物理学
背景:
- ヘルツィグの法則は,細胞分裂の方向性を,細胞間の長軸に沿って記述し,組織発達に不可欠である.
- 表皮細胞の形状は,粘着,ストレス,および極性経路によって影響を受けますが,分裂中にこの形状を感知するメカニズムは不明です.
- ミトーシスの間,上皮細胞は丸くなり,分裂指向のためのインターフェーズ形状情報の継承を複雑にする.
研究 の 目的:
- 皮質細胞が細胞分裂を誘導する際の形状を感知するメカニズムを調査する.
- この形感知プロセスに関与する 分子プレーヤーと構造を特定します
- 細胞がミトーシスに移行する際の分裂指向の維持方法を理解する.
主な方法:
- ドロソフィラエピテリアをモデルシステムとして利用した.
- 細胞分裂を誘導する三細胞結合 (TCJ) の役割を調査した.
- 遺伝子操作と リアルタイム画像と コンピューター・シミュレーションを使った
- ダイネイン関連タンパク質MudとPins/Gαi経路に焦点を当てた.
主要な成果:
- 三細胞結節 (TCJ) は,アストラルマイクロチューブルを引っ張る力発生器を局所化し,ムッドタンパク質を通じて細胞分裂を指向します.
- この指向メカニズムは,古典的なPins/Gαi経路とは独立して動作する.
- TCJは,ミトーシス丸化中に空間的ランドマークとして作用し,分裂を導くためにインターフェーズ細胞形状アニソトロピーをコードします.
- TCJによる形状と機械的なストレスの感知は,上皮組織内の分布幾何学から生じる.
結論:
- TCJは,ドロソフィラの表皮における細胞分裂指向の重要な調節体である.
- TCJは組織環境からの幾何学的および機械的なシグナルを統合し,分裂を誘導します.
- バリア機能を超えて,TCJは上皮の形態変異と組織力学の重要な極性シグナルとして機能する.
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