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http://dx.doi.org/10.5483/BMBRep.2011.44.3.182

Nerve growth factor-induced neurite outgrowth is potentiated by stabilization of TrkA receptors  

Song, Eun-Joo (Integrated Omics Center, Life Health Division, Korea Institute of Science and Technology)
Yoo, Young-Sook (Integrated Omics Center, Life Health Division, Korea Institute of Science and Technology)
Publication Information
BMB Reports / v.44, no.3, 2011 , pp. 182-186 More about this Journal
Abstract
Exogenous stimuli such as nerve growth factor (NGF) exert their effects on neurite outgrowth via Trk neurotrophin receptors. TrkA receptors are known to be ubiquitinated via proteasome inhibition in the presence of NGF. However, the effect of proteasome inhibition on neurite outgrowth has not been studied extensively. To clarify these issues, we investigated signaling events in PC12 cells treated with NGF and the proteasome inhibitor MG132. We found that MG132 facilitated NGF-induced neurite outgrowth and potentiated the phosphorylation of the extracellular signal-regulated kinase/mitogen-activated protein kinase (ERK/MAPK) and phosphatidylinositol-3-kinase (PI3K)/AKT pathways and TrkA receptors. MG132 stimulated internalization of surface TrkA receptor and stabilized intracellular TrkA receptor, and the $Ub^{K63}$ chain was found to be essential for stability. These results indicate that the ubiquitin-proteasome system potentiated neurite formation by regulating the stability of TrkA receptors.
Keywords
MG132; Neurite outgrowth; NGF; Proteasome inhibitor; TrkA receptor;
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