An inhibitory role for FAK in regulating proliferation: a link between limited adhesion and RhoA-ROCK signaling.

An inhibitory role for FAK in regulating proliferation: a link between limited adhesion and RhoA-ROCK signaling.
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DOI:
10.1083/jcb.200510062
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发表时间:
2006-07-17
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Chen CS
Chen CS
中科院分区:
其他
文献类型:
--
作者:
Pirone DM;Liu WF;Ruiz SA;Gao L;Raghavan S;Lemmon CA;Romer LH;Chen CS

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局灶黏附激酶(FAK)将细胞黏附到细胞外基质转化为增殖信号。我们发现FAK过表达诱导内皮细胞增殖,内皮细胞通常因有限的粘附而生长受阻。有趣的是,通过使用FAK - / -细胞系或通过表达c端片段FRNK将FAK从粘连中移出也会导致逃避粘连调节的生长停滞,这表明FAK在生长调节中具有积极和消极的双重作用。在FAK−/−细胞中表达激酶死亡的FAK- y397f可以阻止不受控制的生长,证明了失活FAK的抗增殖功能。与FAK过表达诱导的生长不同,FAK - / -或frnk表达细胞失去生长控制会增加RhoA活性、细胞骨架张力和局灶黏附形成。在这些细胞中,ROCK抑制恢复了粘附依赖的生长控制,组成活性RhoA或ROCK的表达失调了生长。这些发现证明了FAK抑制和促进生长的能力,并强调了多种机制(甚至来自一个分子)控制细胞增殖的重要性。
Focal adhesion kinase (FAK) transduces cell adhesion to the extracellular matrix into proliferative signals. We show that FAK overexpression induced proliferation in endothelial cells, which are normally growth arrested by limited adhesion. Interestingly, displacement of FAK from adhesions by using a FAK−/− cell line or by expressing the C-terminal fragment FRNK also caused an escape of adhesion-regulated growth arrest, suggesting dual positive and negative roles for FAK in growth regulation. Expressing kinase-dead FAK-Y397F in FAK−/− cells prevented uncontrolled growth, demonstrating the antiproliferative function of inactive FAK. Unlike FAK overexpression–induced growth, loss of growth control in FAK−/− or FRNK-expressing cells increased RhoA activity, cytoskeletal tension, and focal adhesion formation. ROCK inhibition rescued adhesion-dependent growth control in these cells, and expression of constitutively active RhoA or ROCK dysregulated growth. These findings demonstrate the ability of FAK to suppress and promote growth, and underscore the importance of multiple mechanisms, even from one molecule, to control cell proliferation.
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