TGFβ経路の異なるTIF1gammaとSmad4分岐によって制御される血液形成
Wei He1, David C Dorn, Hediye Erdjument-Bromage
1Cancer Biology and Genetics Program and Howard Hughes Medical Institute, Memorial Sloan-Kettering Cancer Center, New York, NY 10021, USA.
Cell
|June 6, 2006
まとめ
転写中間因子1gamma (TIF1gamma) はSmad4と競合してSmad2/3を結合し,細胞運命を左右する. この相互作用により,TGFβシグナル伝達に反応して,Smad2/3-TIF1gammaとSmad2/3-Smad4経路が形成されます.
科学分野:
- 細胞および分子生物学
- シグナルトランスデュークション
- 発達生物学 発達生物学とは
背景:
- 組織ホメオスタシスは,Smad転写因子を活性化する変形成長因子-β (TGFbeta) 信号伝達によって調節されます.
- カノニカルTGFβ経路は,Smad4が受容体リン酸化Smads 2および3と結合し,転写調節複合体を形成することを含む.
研究 の 目的:
- 定規のTGFβ経路の潜在的な分岐を調査する.
- TGFβへの反応として,Smadタンパク質の新たな相互作用を特定する.
主な方法:
- トランスクリプション中間因子1gamma (TIF1gamma) とSmad2/3の結合相互作用を様々な細胞タイプで調査した.
- TIF1gammaとSmad4の機能的役割を,ヒトの造血性幹細胞/祖先細胞におけるTGFβ媒介反応で分析した.
主要な成果:
- TIF1gammaは,受容体リン酸化Smad2/3と選択的に結合し,Smad4.4と競合する.
- この結合は,TGFβの刺激により,血液形成細胞,メゼンキマ細胞,上皮細胞で迅速かつ強固に発生する.
- 造血幹細胞/祖先細胞では,TIF1gammaがTGFβ誘発分化を介し,Smad4が抗増殖効果を介する.
結論:
- TGFbeta/Smad経路は,Smad2/3-TIF1gammaとSmad2/3-Smad4.4という2つの相補的なエフェクタアームに分かれています.
- これらの異なる複合体は,分化または反増殖反応のいずれかを媒介して,血液形成細胞の運命を差異的に制御します.
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