ヘッジホッグ/Wntのフィードバックは,膀における上皮幹細胞の再生的増殖をサポートします
Kunyoo Shin1, John Lee, Nini Guo
1Department of Developmental Biology, Institute for Stem Cell Biology and Regenerative Medicine, Howard Hughes Medical Institute, Stanford University School of Medicine, Stanford, California 94305, USA. kunyoos@stanford.edu
Nature
|March 11, 2011
まとめ
膀の幹細胞は,ソニック・ヘッジホッグ (Shh) 信号伝達を通じて,損傷後の泌尿器官を再生します. この経路はWnt信号伝達を刺激し,組織修復と感染制御のための細胞増殖を促進します.
科学分野:
- 泌尿器科 泌尿器科とは
- 再生医学は,再生医療である.
- 発達生物学 発達生物学について
背景:
- 皮質臓器は,傷害後の再生のために幹細胞に依存しています.
- 哺乳類の泌尿器は,休息状態から損傷時の高い増殖まで,ユニークな再生反応を示しています.
- この傷害による再生のメカニズムは十分に理解されていません.
研究 の 目的:
- 損傷後の膀上皮質再生の細胞および分子メカニズムを解明する.
- 損傷に対する膀の反応に関与する重要なシグナル伝達経路を特定する.
主な方法:
- バクテリア感染や化学的傷害に対する泌尿器の反応を研究するためにマウスモデルを使用した.
- 膀再生における基礎細胞,幹細胞,ソニック・ヘッジホッグ (Shh),Wnt信号伝達の役割を調査した.
- 損傷後の細胞増殖と組織修復を分析した.
主要な成果:
- 基礎泌尿器細胞を,全泌尿器を再生できる幹細胞として識別し,ソニック・ヘッジホッグ (Shh) 表現で示した.
- 傷害が基礎細胞のShh発現を増加させ,それがストロマのWnt信号伝達を刺激することを示した.
- Wntシグナル伝達が,組織修復に不可欠な尿路細胞と小管細胞の両方の増殖を促進することを示した.
結論:
- 膀の再生を推進する基礎泌尿器幹細胞とストロマ細胞の間の重要なShh-Wnt信号フィードバックループを発見した.
- この経路は,損傷後の泌尿器官機能の回復に不可欠であり,感染症の除去に役立ちます.
- 発見は,内皮臓器における上皮再生と癌転移との潜在的な関連を理解するための枠組みを提供します.
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