FAK- mediated src phosphorylation of endophilin A2 inhibits endocytosis of MT1-MMP and promotes ECM degradation.
Focal adhesion kinase (FAK) is an important mediator of integrin signaling in the regulation of cell proliferation, survival, migration, and invasion. To understand how FAK contributes to cell invasion, we explored the regulation of matrix metalloproteinases (MMPs) by FAK. We found that v-Src-transformed cells activate a FAK-dependent mechanism that attenuates endocytosis of MT1-MMP. This in turn increases cell-surface expression of MT1-MMP and cellular degradation of extracellular matrix. Further, we identified an interaction between FAK's second Pro-rich motif and endophilin A2's SH3 domain. This interaction served as an autophosphorylation-dependent scaffold to allow Src phosphorylation of endophilin A2 at Tyr315. Tyr315 phosphorylation inhibited endophilin/dynamin interactions, and blockade of Tyr315 phosphorylation promoted endocytosis of MT1-MMP. Together, these results suggest a regulatory mechanism of cell invasion whereby FAK promotes cell-surface presentation of MT1-MMP by inhibiting endophilin A2-dependent endocytosis.[1]References
- FAK-mediated src phosphorylation of endophilin A2 inhibits endocytosis of MT1-MMP and promotes ECM degradation. Wu, X., Gan, B., Yoo, Y., Guan, J.L. Dev. Cell (2005) [Pubmed]
Annotations and hyperlinks in this abstract are from individual authors of WikiGenes or automatically generated by the WikiGenes Data Mining Engine. The abstract is from MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.About WikiGenesOpen Access LicencePrivacy PolicyTerms of Useapsburg
