骨格筋の発達中の基礎膜の横でのミオブラストの移動
1Department of Pharmacology, Stanford University School of Medicine, California 94305-5332.
Nature
|May 24, 1990
まとめ
筋細胞,または筋肉前駆細胞は,正常な筋肉の発達中に基礎膜に移動することができます. この発見は,損傷した筋肉繊維の修復におけるそれらの潜在的な役割を示唆しています.
科学分野:
- 筋肉の発達と再生
- 細胞外マトリックス生物学
- モルフォゲネシス中の細胞移動
背景:
- ベースラミナは,細胞群を分離するバリアとして作用する.
- 筋肉の発達中のミオブラストの移動におけるその役割は不明である.
- この障壁を理解することは,筋肉修復の研究にとって極めて重要です.
研究 の 目的:
- 筋肉の正常な発達中にミオブラストがベースラミナを通過できるかどうかを調査する.
- ミョボラストの移動能力を in vivo で決定する.
- 筋肉繊維の修復への影響を調査する.
主な方法:
- 複製に欠陥のあるレトロウイルスベクターを用いたミオブラストのインビボマーキングは,LacZ.をコードするレトロウイルスベクターを使用します.
- ベータ-ガラクトシダース発現による子孫の運命を分析する.
- クローン分析のための二重ラベルメソッドの開発.
主要な成果:
- ネズミの後肢発達の遅い段階で感染したミオブラストは,複数の筋肉繊維に寄与するクローンを形成した.
- 筋芽細胞が,筋肉繊維を囲む基礎膜を横断して移動できることを実証した.
- 筋肉の発達における系統マーキング研究のための信頼できる方法を確立した.
結論:
- ミョボラストは,正常な筋肉の発達中にベースラミナを横断して活発に移動する.
- この移動能力は,損傷した筋肉繊維の修復におけるミオブラストの役割を示唆しています.
- この発見は,ミオブラストの移動に対する絶対的な障壁として,基礎膜の見方に異議を唱える.
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