TrkA tyrosine residues involved in NGF-induced neurite outgrowth of PC12 cells - PubMed (original) (raw)
TrkA tyrosine residues involved in NGF-induced neurite outgrowth of PC12 cells
N Inagaki et al. Eur J Neurosci. 1995.
Abstract
The proto-oncogene product gp140prototrk (TrkA) is the receptor tyrosine kinase that mediates nerve growth factor-induced neuronal survival and differentiation. In receptor tyrosine kinases, specific intracellular tyrosine residues become phosphorylated after ligand binding and the phosphorylated tyrosines induce the cascade of signal transduction. Here we have identified intracellular tyrosine residues of TrkA involved in nerve growth factor-induced neurite outgrowth of PC12 cells, using site-directed mutagenesis and a PC12 cell line expressing very low levels of endogenous TrkA (PC12nnr5 cells). We analysed eight conserved intracellular tyrosine residues of TrkA while the three putative autophosphorylation sites conferring tyrosine kinase activity were left intact. Five tyrosine residues, Y499, Y643, Y704, Y760 and Y794, in rat TrkA were involved in nerve growth factor-induced neurite outgrowth. None of these tyrosines mediated the full activity of wild-type TrkA, and a pair of these tyrosines, Y760 and Y794, promoted neurite outgrowth in an additive manner. These data indicate that no single tyrosine is sufficient to induce complete neurite outgrowth but the five tyrosine residues Y499, Y643, Y704, Y760 and Y794 cooperate to exhibit the full activity of wild-type TrkA.
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