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Here, we report that CRP1 colocalizes with actin in the filopodia of growth cones in cultured rat hippocampal neurons. Knockdown of CRP1 expression by short hairpin RNA interference results in inhibition of filopodia formation and dendritic growth in neurons. Overexpression of CRP1 increases filopodia formation and neurite branching, which require its actin-bundling activity. Expression of CRP1 with a constitutively active form of Cdc42, a GTPase involved in filopodia formation, increases filopodia formation in COS-7 cells, suggesting cooperation between the two proteins. Moreover, we demonstrate that neuronal activity upregulates CRP1 expression in hippocampal neurons via Ca<jats:sup>2+<\/jats:sup>influx after depolarization. Ca<jats:sup>2+<\/jats:sup>\/calmodulin-dependent protein kinase IV (CaMKIV) and cAMP response element binding protein mediate the Ca<jats:sup>2+<\/jats:sup>-induced upregulation of CRP1 expression. Furthermore, CRP1 is required for the dendritic growth induced by Ca<jats:sup>2+<\/jats:sup>influx or CaMKIV. Together, these data are the first to demonstrate a role for CRP1 in dendritic growth.<\/jats:p>","DOI":"10.1523\/jneurosci.2595-11.2011","type":"journal-article","created":{"date-parts":[[2011,11,17]],"date-time":"2011-11-17T09:16:37Z","timestamp":1321521397000},"page":"16781-16791","source":"Crossref","is-referenced-by-count":18,"title":["CRP1, a Protein Localized in Filopodia of Growth Cones, Is Involved in Dendritic Growth"],"prefix":"10.1523","volume":"31","author":[{"given":"Liping","family":"Ma","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jeffrey 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