新型亜鉛指を含む転写因子オステリックスは,オステオブラストの分化と骨形成に必要である

Kazuhisa Nakashima¹, Xin Zhou, Gary Kunkel

¹Department of Molecular Genetics and Program in Genes and Development, M. D. Anderson Cancer Center, University of Texas, 1515 Holcombe Boulevard, Houston, TX 77030, USA.

Cell

|January 17, 2002

まとめ

オステリックス (Osx) は,骨形成の重要な転写因子です. OsxはRunx2/Cbfa1のダウンストリームで作用し,その欠如は骨格細胞の分化を防止し,骨の発達を停止します.

科学分野:

分子生物学は分子生物学である.
発達生物学発達生物学とは
遺伝学遺伝学とは

背景:

骨の発達は,オステオブラストの微分化の正確な調節に依存しています.
転写因子は,骨格形成を制御する上で重要な役割を果たします.
オステオゲネシスを支配する分子機構は複雑で,完全に理解されていない.

研究の目的:

骨形成に関与する新しい転写因子を特定する.
骨格の発達におけるオステリックス (Osx) の役割を明らかにする.
オステオゲネシスにおけるOsxとRunx2/Cbfa1の関係を決定する.

主な方法:

Osxゼロマウスの生成と分析.
Runx2/Cbfa1 ゼロマウスの分析.
骨格組織の遺伝子発現分析.

主要な成果:

オステリックス (Osx) は新しい亜鉛指転写因子で,骨の発達に特異的に発現しています.
Osx nullマウスは,骨形成の完全な欠如を示しています.
Osx nullマウスのメゼンキマ細胞は,Runx2/Cbfa1.1を発現しているにもかかわらず,骨質芽細胞に微分化することができません.
Osxの発現はRunx2/Cbfa1に依存しており,Osxが下流で作用することを示しています.

結論:

Osxは,オステオブラストの分化と骨形成に不可欠です.
OsxはRunx2/Cbfa1のダウンストリームで,骨形成経路で機能する.
Runx2/Cbfa1発現するプレオステオブラストは,Osxがそれらをオステオブラストの系統に向けることで,バイポテンシャルである可能性があります.

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