p190RhoGap is the convergence point of adhesion signals from α5β1integrin and syndecan-4

M.D Bass, M.R Morgan, K.A Roach, J Settleman, A.B Goryachev, M.J Humphries

Research output: Contribution to journalArticle (Academic Journal)peer-review

89 Citations (Scopus)


The fibronectin receptors α5β1 integrin and syndecan-4 cocluster in focal adhesions and coordinate cell migration by making individual contributions to the suppression of RhoA activity during matrix engagement. p190Rho–guanosine triphosphatase–activating protein (GAP) is known to inhibit RhoA during the early stages of cell spreading in an Src-dependent manner. This paper dissects the mechanisms of p190RhoGAP regulation and distinguishes the contributions of α5β1 integrin and syndecan-4. Matrix-induced tyrosine phosphorylation of p190RhoGAP is stimulated solely by engagement of α5β1 integrin and is independent of syndecan-4. Parallel engagement of syndecan-4 causes redistribution of the tyrosine-phosphorylated pool of p190RhoGAP between membrane and cytosolic fractions by a mechanism that requires direct activation of protein kinase C α by syndecan-4. Activation of both pathways is necessary for the efficient regulation of RhoA and, as a consequence, focal adhesion formation. Accordingly, we identify p190RhoGAP as the convergence point for adhesive signals mediated by α5β1 integrin and syndecan-4. This molecular mechanism explains the cooperation between extracellular matrix receptors during cell adhesion.
Translated title of the contributionp190RhoGap is the convergence point of adhesion signals from α5β1integrin and syndecan-4
Original languageEnglish
Pages (from-to)1013 - 1026
Number of pages14
JournalJournal of Cell Biology
Issue number6
Publication statusPublished - Jun 2008


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