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Rescue experiments using point mutations demonstrate an absolute requirement for Cdc42 binding to WASp in podosome formation. Although tyrosine phosphorylation was not absolutely required for podosome formation, phosphorylation did regulate the rate of podosome nucleation and actin filament stability. Importantly, WASp tyrosine phosphorylation does not alter WASp activation, instead phosphorylation appears to be important for the restriction of WASp activity to podosomes. In addition, the matrix-degrading ability of cells requires WASp phosphorylation. Chemotactic responses to CSF-1 were also attenuated in the absence of endogenous WASp, which could not be rescued with either tyrosine mutation. These results suggest a more complex role for tyrosine phosphorylation than simply in the regulation of WASp activity, and suggest a link between podosome dynamics and macrophage migration.<\/jats:p>","DOI":"10.1242\/jcs.051755","type":"journal-article","created":{"date-parts":[[2009,10,7]],"date-time":"2009-10-07T03:44:52Z","timestamp":1254887092000},"page":"3873-3882","source":"Crossref","is-referenced-by-count":94,"title":["Regulation of podosome dynamics by WASp phosphorylation: implication in matrix degradation and chemotaxis in macrophages"],"prefix":"10.1242","volume":"122","author":[{"given":"Athanassios","family":"Dovas","sequence":"first","affiliation":[{"name":"Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, Bronx, NY 10461, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jean-Claude","family":"Gevrey","sequence":"additional","affiliation":[{"name":"Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, Bronx, NY 10461, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alberto","family":"Grossi","sequence":"additional","affiliation":[{"name":"Department of Food Science, Faculty of Life Science, University of Copenhagen, Rolighedsvej 30-1958, Frederiksberg C, Denmark"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Haein","family":"Park","sequence":"additional","affiliation":[{"name":"Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, Bronx, NY 10461, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wassim","family":"Abou-Kheir","sequence":"additional","affiliation":[{"name":"Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, Bronx, NY 10461, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dianne","family":"Cox","sequence":"additional","affiliation":[{"name":"Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, Bronx, NY 10461, USA"},{"name":"Department of Developmental and Molecular Biology, Albert Einstein College of Medicine, Bronx, NY 10461, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"237","reference":[{"key":"2021111216223035000_REF1","doi-asserted-by":"crossref","unstructured":"Abou Kheir, W., Gevrey, J. 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