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- W2055878844 abstract "In pheochromocytoma 12 (PC12) cells and sympathetic neurons, nerve growth factor (NGF) engagement with the tropomyosin-related tyrosine kinase (TrkA) receptor activates the serine/threonine kinase glycogen synthase kinase 3beta (GSK3beta), enabling it to phosphorylate the microtubule-associated protein 1B (MAP1B). GSK3beta phosphorylation of MAP1B acts as a molecular switch to regulate microtubule dynamics in growing axons, and hence the rate of axon growth. An important question relates to the identification of the upstream pathway linking the activation of GSK3beta with TrkA engagement. TrkA can utilise a number of intracellular signalling pathways, including the mitogen-activated protein kinase (MAPK) pathway and the phosphatidylinositol-3 kinase (PI3K) pathway. We now show, using pharmacological inhibitor studies of PC12 cells and sympathetic neurons in culture and in vitro kinase and activation assays, that the MAPK pathway, and not the PI3K pathway, links NGF engagement with the TrkA receptor to GSK3beta activation in PC12 cells and sympathetic neurons. We also show that activated GSK3beta is a small fraction of the total GSK3beta present in developing brain and that it is not part of a multiprotein complex. Thus, NGF drives increased neurite growth rates partly by coupling the MAPK pathway to the activation of GSK3beta and thereby phosphorylation of MAP1B." @default.
- W2055878844 created "2016-06-24" @default.
- W2055878844 creator A5015410132 @default.
- W2055878844 creator A5063449990 @default.
- W2055878844 date "2005-03-01" @default.
- W2055878844 modified "2023-09-25" @default.
- W2055878844 title "The MAP kinase pathway is upstream of the activation of GSK3β that enables it to phosphorylate MAP1B and contributes to the stimulation of axon growth" @default.
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- W2055878844 doi "https://doi.org/10.1016/j.mcn.2004.11.005" @default.
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