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The Src-like adaptor protein regulates PDGF-induced actin dorsal ruffles in a c-Cbl-dependent manner

Oncogene volume 27, pages 3494–3500 (2008)Cite this article

Abstract

The Src-like adaptor protein (SLAP) belongs to the subfamily of adapter proteins that negatively regulate cellular signalling initiated by tyrosine kinases. SLAP has a unique, myristylated N-terminus, followed by SH3 and SH2 domains with high homology to Src family tyrosine kinases (SFK) and a unique C-terminal tail, which is important for c-Cbl binding. We have previously shown that SLAP negatively regulates platelet-derived growth factor (PDGF)-induced mitogenesis in fibroblasts and we now report that it regulates F-actin assembly for dorsal ruffles formation. c-Cbl mediated SLAP inhibition towards actin remodelling. Moreover, SLAP enhanced PDGF-induced c-Cbl phosphorylation by SFK. In contrast, SLAP mitogenic inhibition was not mediated by c-Cbl, but it rather involved a competitive mechanism with SFK for PDGF-receptor (PDGFR) association and mitogenic signalling. Accordingly, phosphorylation of the Src mitogenic substrates Stat3 and Shc were reduced by SLAP. Thus, we concluded that SLAP regulates PDGFR signalling by two independent mechanisms: a competitive mechanism for PDGF-induced Src mitogenic signalling and a non-competitive mechanism for dorsal ruffles formation mediated by c-Cbl.

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Acknowledgements

We thank H Band, I Gross, U Hibner, WY Langdon and N Morin for various reagents. This work was supported by grants of the CNRS, University of Montpellier I and II, INCa and ARC. AS was supported by SERVIER laboratories and CL by INCa. SR is an INSERM investigator.

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  1. A Boureux

    Present address: 3Current address: IGH UPR1142-UMII, place Eugène Bataillon, Montpellier 34095, France.,

  2. A Sirvent and C Leroy: These authors contributed equally to this work

Authors and Affiliations

  1. CRBM, CNRS UMR5237, UMI and II, Montpellier, France

    A Sirvent, C Leroy, A Boureux, V Simon & S Roche

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  1. A Sirvent
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Correspondence to S Roche.

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Sirvent, A., Leroy, C., Boureux, A. et al. The Src-like adaptor protein regulates PDGF-induced actin dorsal ruffles in a c-Cbl-dependent manner. Oncogene 27, 3494–3500 (2008). https://doi.org/10.1038/sj.onc.1211011

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