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

Dana M. Pirone, Wendy F. Liu, Sami Alom Ruiz, Lin Gao, Srivatsan Raghavan, Christopher A. Lemmon, Lewis H. Romer, Christopher S. Chen

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish (US)
Pages (from-to)277-288
Number of pages12
JournalJournal of Cell Biology
Volume174
Issue number2
DOIs
StatePublished - Jul 17 2006

ASJC Scopus subject areas

  • Cell Biology

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