title: Dishevelled-1 regulates microtubule stability: a new function mediated by glycogen synthase kinase-3beta.
abstract: Dishevelled has been implicated in the regulation of cell fate decisions, cell polarity, and neuronal function. However, the mechanism of Dishevelled action remains poorly understood. Here we examine the cellular localization and function of the mouse Dishevelled protein, DVL-1. Endogenous DVL-1 colocalizes with axonal microtubules and sediments with brain microtubules. Expression of DVL-1 protects stable microtubules from depolymerization by nocodazole in both dividing cells and differentiated neuroblastoma cells. Deletion analyses reveal that the PDZ domain, but not the DEP domain, of DVL-1 is required for microtubule stabilization. The microtubule stabilizing function of DVL-1 is mimicked by lithium-mediated inhibition of glycogen synthase kinase-3beta (GSK-3beta) and blocked by expression of GSK-3beta. These findings suggest that DVL-1, through GSK-3beta, can regulate microtubule dynamics. This new function of DVL-1 in controlling microtubule stability may have important implications for Dishevelled proteins in regulating cell polarity.
authors.affiliation: The Randall Institute, King's College London, London, United Kingdom.
authors.forename: O
authors.initials: O
authors.lastname: Krylova
authors.forename: M J
authors.initials: MJ
authors.lastname: Messenger
authors.forename: P C
authors.initials: PC
authors.lastname: Salinas
mesh_terms: D048868:Adaptor Proteins, Signal Transducing; D000818:Animals; D001369:Axons / Q000737:chemistry / Q000648:ultrastructure; D001921:Brain / Q000254:growth & development; D017871:Calcium-Calmodulin-Dependent Protein Kinases / Q000302:isolation & purification*; D002465:Cell Movement; D016764:Cell Polarity; D000072261:Dishevelled Proteins; D005455:Fluorescent Antibody Technique; D038362:Glycogen Synthase Kinase 3; D038341:Glycogen Synthase Kinases; D051379:Mice; D008870:Microtubules / Q000737:chemistry* / Q000648:ultrastructure; D009419:Nerve Tissue Proteins / Q000302:isolation & purification*; D009474:Neurons / Q000737:chemistry* / Q000648:ultrastructure; D010750:Phosphoproteins / Q000302:isolation & purification*
chemical_list: D048868:Adaptor Proteins, Signal Transducing; D000072261:Dishevelled Proteins; C000606579:Dvl1 protein, mouse; D009419:Nerve Tissue Proteins; D010750:Phosphoproteins; D038341:Glycogen Synthase Kinases; D017871:Calcium-Calmodulin-Dependent Protein Kinases; D038362:Glycogen Synthase Kinase 3