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Baeyens, Nicolas; de Meester, Carole; Yerna, Xavier; Morel, Nicole
Journal of cellular biochemistry, September 2011, Letnik: 112, Številka: 9Journal Article
Ezrin, Radixin, Moesin binding phosphoprotein 50 (EBP50) is a scaffold protein that possesses two PDZ interacting domains. We have shown that, in isolated artery stimulated with noradrenaline, EBP50 interacts with several elements of the cytoskeleton. However, the contribution of EBP50 to the organization of the cytoskeleton is unknown. We have used primary cultured vascular smooth muscle cells to investigate the involvement of EBP50 in the regulation of cell architecture, motility and cell cycle, and to identify its target proteins and subsequent action mechanism. The results showed that depletion of EBP50 by siRNA transfection induced changes in cell architecture and increased cell migration. The same phenotype was induced by inhibition of myosin IIa and this effect was not additive in cells depleted for EBP50. Moreover, a larger proportion of binucleated cells was observed after EBP50 depletion, indicating a defect in cytokinesis. The identification, after co‐immunoprecipitation, of a direct interaction of EBP50 with both tubulin and myosin IIa suggested that EBP50 could regulate cell migration and cytokinesis by linking myosin IIa fibers and microtubule network. Indeed, depletion of EBP50 also dismantled myosin IIa fibers and induced the formation of stable microtubules in lamellae expansions and Rac1 activation. This signaling cascade leads to the formation of lamellipodia, trailing tails and decrease of focal adhesion formation, triggering cell migration. J. Cell. Biochem. 112: 2574–2584, 2011. © 2011 Wiley‐Liss, Inc.
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