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RCP-driven alpha 5 beta 1 recycling suppresses Rac and promotes RhoA activity via the RacGAP1-IQGAP1 complex




TekijätJacquemet G, Green DM, Bridgewater RE, von Kriegsheim A, Humphries MJ, Norman JC, Caswell PT

KustantajaROCKEFELLER UNIV PRESS

Julkaisuvuosi2013

JournalJournal of Cell Biology

Tietokannassa oleva lehden nimiJOURNAL OF CELL BIOLOGY

Lehden akronyymiJ CELL BIOL

Vuosikerta202

Numero6

Aloitussivu917

Lopetussivu935

Sivujen määrä19

ISSN0021-9525

DOIhttps://doi.org/10.1083/jcb.201302041


Tiivistelmä
Inhibition of alpha v beta 3 or expression of mutant p53 promotes invasion into fibronectin (FN)-containing extracellular matrix (ECM) by enhancing Rob-coupling protein (RCP)-dependent recycling of alpha 5 beta 1 integrin. RCP and alpha 5 beta 1 cooperatively recruit receptor tyrosine kinases, including EGFR1, to regulate their trafficking and downstream signaling via protein kinase B (PKB)/Akt, which, in turn, promotes invasive migration. In this paper, we identify a novel PKB/Akt substrate, RacGAP1, which is phosphorylated as a consequence of RCP-dependent alpha 5 beta 1 trafficking. Phosphorylation of RacGAP1 promotes its recruitment to IQGAP1 at the tips of invasive pseudopods, and RacGAP1 then locally suppresses the activity of the cytoskeletal regulator Rac and promotes the activity of RhoA in this subcellular region. This Rac to RhoA switch promotes the extension of pseudopodial processes and invasive migration into FN-containing matrices, in a RhoA-dependent manner. Thus, the localized endocytic trafficking of alpha 5 beta 1 within the tips of invasive pseudopods elicits signals that promote the reorganization of the actin cytoskeleton, protrusion, and invasion into FN-rich ECM.



Last updated on 2024-26-11 at 22:42