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. 1999 Apr 15;18(8):2106–2118. doi: 10.1093/emboj/18.8.2106

The p16(INK4a) tumour suppressor protein inhibits alphavbeta3 integrin-mediated cell spreading on vitronectin by blocking PKC-dependent localization of alphavbeta3 to focal contacts.

R Fåhraeus 1, D P Lane 1
PMCID: PMC1171295  PMID: 10205165

Abstract

Expression of full-length p16(INK4a) blocks alphavbeta3 integrin-dependent cell spreading on vitronectin but not collagen IV. Similarly, G1-associated cell cycle kinases (CDK) inhibitory (CKI) synthetic peptides derived from p16(INK4a), p18(INK4c) and p21(Cip1/Waf1), which can be delivered directly into cells from the tissue culture medium, do not affect non-alphavbeta3-dependent spreading on collagen IV, laminin and fibronectin at concentrations that inhibit cell cycle progression in late G1. The alphavbeta3 heterodimer remains intact after CKI peptide treatment but is immediately dissociated from the focal adhesion contacts. Treatment with phorbol 12-myristate 13-acetate (PMA) allows alphavbeta3 to locate to the focal adhesion contacts and the cells to spread on vitronectin in the presence of CKI peptides. The cdk6 protein is found to suppress p16(INK4a)-mediated inhibition of spreading and is also shown to localize to the ruffling edge of spreading cells, indicating a function for cdk6 in controlling matrix-dependent cell spreading. These results demonstrate a novel G1 CDK-associated integrin regulatory pathway that acts upstream of alphavbeta3-dependent activation of PKC as well as a novel function for the p16(INK4a) tumour suppressor protein in regulating matrix-dependent cell migration.

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Selected References

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