Tcf3は幹細胞の特徴を制御し,皮膚の細胞運命決定を抑制する
Hoang Nguyen1, Michael Rendl, Elaine Fuchs
1Howard Hughes Medical Institute, Department of Mammalian Cell Biology and Development, The Rockefeller University, 1230 York Avenue, Box 300, New York, NY 10021, USA.
Cell
|October 5, 2006
まとめ
ベータ-カタニンのDNA結合パートナーであるTCf3は,Wnt信号なしで皮膚幹細胞 (SCs) を無差別状態に保ちます. Wntが活性化すると,TCf3はSCを毛細胞の運命に導く.
科学分野:
- 発達生物学 発達生物学とは
- 幹細胞生物学 幹細胞生物学
- 皮膚科 皮膚科について
背景:
- 幹細胞 (SCs) は,差異化のためにWntシグナル伝達に依存することが多い.
- Wntシグナル伝達のないSCにおいて,β-カタニンのDNA結合パートナーであるTcf3の役割は不明である.
- 皮膚の原始細胞はTcf3を発現し,毛細胞の運命を決定するWnt信号に反応する.
研究 の 目的:
- Wnt信号伝達がない場合の皮膚幹細胞におけるTcf3の機能を調査する.
- Tcf3が幹細胞の集団を維持し,分化経路に影響を与えるかどうかを判断する.
- 皮膚の原始細胞の転写制御におけるTcf3の役割を明らかにする.
主な方法:
- ネズミの誘導システムを使用して,皮膚の祖先のTcf3発現を制御しました.
- Tcf3再活性化時に発生する遺伝子発現の変化を,コミットされた表皮細胞で分析した.
- Tcf3誘導が表皮,脂質腺,毛皮の分化経路に与える影響を調査した.
主要な成果:
- Tcf3の活性化がコミットした表皮細胞で発生すると,無差別でWnt抑制状態に関連した遺伝子が誘発される.
- Tcf3は,胚性および産後皮膚幹細胞に共通する転写プログラムを促進しました.
- Tcf3は,表皮,脂質腺,毛皮の分化に関与する遺伝子を抑制し,誘導時にこれらの経路を抑制しました.
結論:
- Tcf3は,Wnt信号がない場合でも不分化状態を維持するために,皮膚SCsで機能します.
- Wntシグナリングは,Tcf3と組み合わせて,皮膚SCsを髪の系へのコミットメントに導きます.
- Tcf3は,幹細胞の自己再生と皮膚の分化とのバランスを調節する上で重要な役割を果たします.
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