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- W2022156691 abstract "In vivo, kinase C phosphorylation of the growth-associated protein GAP-43 is spatially and temproally associated with the proximity of growing axons to their targets. Here we have used dissociated dorsal root ganglia (DRG)s and an antibody specific for the phosphorylated form of GAP-43 to demonstrate that neurite regeneration in culture also begins in the absence of detectable levels of phosphorylated GAP-43. Since the β isoform of kinase C was found to be enriched in growth cones before stably phosphorylated GAP-43 was detected, it may normally be inactive during initial neurite outgrowth; however, premature phosphorylation of GAP-43 could be stimulated in newly dissociated DRGs by plating them on cultures in which phosphorylation had already been initiated; media conditioned by such cultures caused no response suggesting an effect of either cell-cell or cell-substrate contact. Increased GAP-43 phosphorylation correlated with a reduced extent of neurite outgrowth but not with the rate at which individual growth cones translocated so that motile growth cones contained very low levels of phosphorylated GAP-43, whereas stationary growth cones showed much more immunoreactivity. Downregulation of kinase C by phorbol ester prevented increased GAP-43 phosphorylation and led to growth cone collapse. Finally, phosphorylated GAP-43 was found to be differently distributed within growth cones. Increased immunoreactivity was frequently observed in the neck of the growth cone and was heterogeneously distributed in lamellae and filopodia. These results, which demonstrate the dynamic regulation of GAP-43 phosphorylation in individual growth cones, are discussed with reference to the association between changes in growth cone shape and the ability to translocate and change direction. © 1992 John Wiley & Sons, Inc." @default.
- W2022156691 created "2016-06-24" @default.
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- W2022156691 date "1992-10-01" @default.
- W2022156691 modified "2023-10-18" @default.
- W2022156691 title "GAP-43 phosphorylation is dynamically regulated in individual growth cones" @default.
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- W2022156691 doi "https://doi.org/10.1002/neu.480230809" @default.
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