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Updated: Jul 24, 2026

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RhoC GTPase Activation Assay
Published on: August 22, 2010
Cdc42とRac1はPIによってインテグリン媒介の細胞運動性と侵入性を誘導する
P J Keely1, J K Westwick, I P Whitehead
1Department of Pharmacology, Lineberger Comprehensive Cancer Center, University of North Carolina, Chapel Hill 27599-7365, USA. pkeely@med.unc.edu
Nature
|December 24, 1997
まとめ
哺乳類の上皮細胞におけるCdc42とRac1の活性化により,細胞の偏極化が乱され,侵入が促進される. このプロセスは,PI(3) Kを強調する他の経路ではなく,Phosphatidylinositol-3-OHキナーゼ (PI(3) K) シグナル伝達を必要とします.
科学分野:
- 細胞生物学 細胞生物学
- がん研究 がん研究
- 分子生物学は分子生物学である.
背景:
- マンマの上皮細胞が侵襲性がんに変容すると,インテグリン-ECM相互作用が変化します.
- アクチン細胞骨格の変化は,Cdc42とRac GTPasesの細胞運動性と侵入における役割を示唆しています.
- Cdc42とRac1が表皮細胞における特定の役割,特にインテグリン媒介イベントに関する役割は不明である.
研究 の 目的:
- 乳腺上皮細胞の偏極化,運動性,侵入におけるCdc42とRac1の活性化の役割を調査する.
- これらの細胞変化を媒介するCdc42とRac1の下流のシグナル伝達経路を決定する.
主な方法:
- コラーゲンマトリックスで培養された乳腺上皮細胞におけるCdc42とRac1の活性化.
- 細胞の二極化,運動,侵入の評価.
- PAK,JNK,p70 S6キナーゼ,Rho,およびフォスファディチルイノシトール-3-OHキナーゼ (PI(3) Kを含む様々なシグナリングキナーゼの薬理学的抑制.
主要な成果:
- Cdc42とRac1の活性化により,正常な上皮細胞の偏分が乱され,運動性と侵入性が促進された.
- この運動性は,フォスファディチルイノシトール-3-OHキナーゼ (PI(3) K) の活性化に依存していたが,PAK,JNK,p70 S6キナーゼ,またはRho.の活性化には依存しなかった.
- 直接PI(3) Kの活性化はCdc42/Rac1の効果を模倣し,極化喪失,運動性,侵入を誘発した.
結論:
- Cdc42とRac1の活性化は,乳腺上皮細胞の侵入と分極性の喪失の主要な要因である.
- フォスファディチルイノシトール-3-OHキナーゼ (PI(3) K) は,Cdc42/Rac1誘発の運動性と侵入の重要な下流媒介体である.
- PI(3) Kのシグナル伝達はアクチン組織に影響を与え,それによって乳腺上皮細胞の細胞運動性と侵入性を調節する.
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