title: Filopodial calcium transients regulate growth cone motility and guidance through local activation of calpain.
abstract: Spontaneous intracellular calcium ([Ca2+](i)) transients in growth cone filopodia reduce filopodial motility, slow neurite outgrowth, and promote turning when generated asymmetrically; however, the downstream effectors of these Ca2+ -dependent behaviors are unknown. We report that Ca2+ transients in filopodia activate the intracellular protease calpain, which slows neurite outgrowth and promotes repulsive growth cone turning upon local activation. Active calpain alters the balance between tyrosine kinase and phosphatase activities in filopodia, resulting in a net decrease in tyrosine phosphorylation, which mediates both filopodial stabilization and reduced lamellipodial protrusion. Our findings indicate that locally generated Ca2+ signals repel axon outgrowth through calpain-dependent regulation of phosphotyrosine signaling at integrin-mediated adhesion sites.
authors.affiliation: Department of Anatomy, University of Wisconsin, Madison, WI 53713, USA.
authors.forename: Estuardo
authors.initials: E
authors.lastname: Robles
authors.forename: Anna
authors.initials: A
authors.lastname: Huttenlocher
authors.forename: Timothy M
authors.initials: TM
authors.lastname: Gomez
mesh_terms: D000818:Animals; D002118:Calcium / Q000378:metabolism*; D020013:Calcium Signaling / Q000502:physiology*; D002154:Calpain / Q000378:metabolism*; D002448:Cell Adhesion / Q000502:physiology; D002478:Cells, Cultured; D003599:Cytoskeleton / Q000378:metabolism; D020439:Growth Cones / Q000201:enzymology*; D009474:Neurons / Q000201:enzymology / Q000648:ultrastructure; D010766:Phosphorylation; D019000:Phosphotyrosine / Q000378:metabolism; D011554:Pseudopodia / Q000201:enzymology*; D013116:Spinal Cord / Q000166:cytology; D013379:Substrate Specificity; D014443:Tyrosine / Q000378:metabolism; D014981:Xenopus; D019061:src-Family Kinases / Q000037:antagonists & inhibitors / Q000378:metabolism
chemical_list: D019000:Phosphotyrosine; D014443:Tyrosine; D019061:src-Family Kinases; D002154:Calpain; D002118:Calcium