パーオキシレドキシンIIによるPDGFシグナル伝達と血管再構築の調節
Min Hee Choi1, In Kyung Lee, Gyung Whan Kim
1Division of Molecular Life Sciences and the Center for Cell Signaling Research, Ewha Womans University, Seoul 120-750, Korea.
Nature
|May 20, 2005
まとめ
哺乳類の2-CysペロキシレドキシンII型 (Prx II) は,過酸化水素レベルを制御することによって,血小板由来成長因子 (PDGF) 信号伝達を負面に調節する. Prx II欠乏症はPDGF受容体の活性化を高め,細胞の増殖と移動を増加させます.
科学分野:
- 細胞生物学 細胞生物学
- バイオケミストリー バイオケミストリー
- 分子生物学は分子生物学である.
背景:
- 血小板由来成長因子 (PDGF) は,細胞増殖と移動の重要な調節因子であり,細胞内過酸化水素 (H2O2) の生成を伴う.
- 哺乳類2-CysペロキシレドキシンII型 (PrxII) は,H2O2を吸収する細胞性ペロキシダースですが,成長因子シグナル伝達における役割は不明です.
研究 の 目的:
- PDGFシグナル伝達経路におけるPrx IIの役割を調査する.
- Prx IIがPDGF受容体活性化および下流の細胞応答の調節剤として作用するかどうかを決定する.
主な方法:
- Prx II欠乏細胞とワイルド型のPrx II発現システムを利用した.
- 評価されたPDGF受容体 (PDGFR) アクティベーション,フォスフォリファーゼCgamma1活性,およびH2O2レベル.
- 細胞の増殖,移動,およびネオインティマルの濃縮を,ネズミのリステノシスモデルで調べました.
主要な成果:
- Prx IIの欠乏は,H2O2の産生を増加させ,PDGFRとCgamma1フォスフォリファースの活性化を高めました.
- Prx II欠乏細胞は,PDGFに対する反応として,増殖と移動を増加させた.
- 野生型のPrx IIは,不活性な変異体ではないが,これらの強化された反応を抑制した.
- Prx IIは,刺激と抑制されたタンパク質チロシンフォスファタゼ不活性化により,PDGFRに採用されました.
- Prx IIは,主細胞とレステノシスモデルにおけるPDGFRの活性化を抑制し,ネオインティマルの濃縮を減少させた.
結論:
- Prx IIは,局所的なH2O2レベルを調節することにより,PDGFシグナル伝達の負の調節剤として作用します.
- Prx IIはPDGFRの活性化と下流の細胞イベントを制御する上で重要な役割を果たします.
- Prx IIは,心血管疾患,特にPDGFに依存する血管の滑らかな筋肉細胞増殖において,機能的な役割を果たしています.
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