脊椎動物の左-右非対称性の調節は,細胞外マトリックスによって行われます
1Department of Cell Biology and Neuroanatomy, University of Minnesota, Minneapolis 55455.
Nature
|May 14, 1992
まとめ
細胞外マトリクスは,Xenopus胚の左-右の身体軸形成を導く. この行列を混乱させると,通常の非対称性が破壊され,臓器発達の重要な軸情報を保持していることを示唆する.
科学分野:
- 発達生物学 発達生物学とは
- 胚学 胚学について
- 細胞外マトリックス研究
背景:
- 脊椎動物の体平面は,前後,背中中,左右の3つの軸に依存しています.
- 心臓と腸の発達に不可欠な左-右軸の決定は,未だに十分に理解されていない.
- Xenopus laevis gastrulaeの繊維素素に富んだ細胞外マトリックス (ECM) は,移動する心臓および内臓のプライモルディアの基礎となっている.
研究 の 目的:
- 脊椎動物の発達中の左-右非対称性の確立における細胞外マトリックスの役割を調査する.
- ECMが発達中の臓器に軸情報を含み,伝達しているかどうかを判断する.
主な方法:
- Xenopus laevis gastrulaeの微小手術によるECMの局所的な干渉.
- ブラストコエルにArg-Gly-Aspペプチドまたはヘパリナーゼのマイクロ注入によるECMの全局的混乱.
- 心臓と内臓の発達における左-右非対称性のランダム化とECMの混乱の相関.
主要な成果:
- 局所的なECMの混乱は,左-右非対称性の局所的なランダム化につながった.
- グローバルなECMの混乱は,左-右非対称性の広範なランダム化をもたらしました.
- これらの発見は,ECMが左から右の軸形成を指揮する上で果たす重要な役割を示している.
結論:
- 細胞外マトリックスには,胚の発達初期に不可欠な左-右軸情報が含まれています.
- この軸の情報は,心臓と内臓の両方に独立して伝達されます.
- ECMの整合性は,正しい左-右のボディパターニングに不可欠です.
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