title: Transient association of the phosphotyrosine phosphatase SHP-2 with TrkA is induced by nerve growth factor.
abstract: Nerve growth factor (NGF) treatment of rat PC12 pheochromocytoma cells results in an increase in the tyrosine phosphorylation of the NGF receptor, TrkA, leading to differentiation to a neuronal phenotype. Dephosphorylation by protein tyrosine phosphatases (PTPases) is thought to play an important role in regulating this signaling pathway. To identify PTPases that are recruited to the activated TrkA receptor, we used an in-gel PTPase assay to examine the presence of PTPases in TrkA immunoprecipitates. The Src homology 2 domain containing PTPase SHP-2 was found to associate transiently with TrkA following receptor activation, reaching a peak after 1 min of NGF treatment and then decreasing rapidly. The association of SHP-2 with TrkA was accompanied by the tyrosine phosphorylation of SHP-2 and an association of SHP-2 with multiple tyrosine-phosphorylated proteins. In addition, the PTPase activity in SHP-2 immunoprecipitates increased greater than twofold after 1 min of NGF treatment. This is the first demonstration that the association of SHP-2 with TrkA is induced by NGF and that this association leads to SHP-2 activation and tyrosine phosphorylation. We conclude that SHP-2 plays a significant role in early biochemical events in TrkA-mediated signal transduction.
authors.affiliation: Nervous System Group, Takarazuka Research Institute, Novartis Pharma K.K., Takarazuka, Japan.
authors.forename: B A
authors.initials: BA
authors.lastname: Goldsmith
authors.forename: S
authors.initials: S
authors.lastname: Koizumi
mesh_terms: D000310:Adrenal Gland Neoplasms; D000818:Animals; D015153:Blotting, Western; D047908:Intracellular Signaling Peptides and Proteins; D007700:Kinetics; D009414:Nerve Growth Factors / Q000494:pharmacology*; D016716:PC12 Cells; D010673:Pheochromocytoma; D010766:Phosphorylation; D011485:Protein Binding; D054592:Protein Tyrosine Phosphatase, Non-Receptor Type 11; D053824:Protein Tyrosine Phosphatase, Non-Receptor Type 6; D017027:Protein Tyrosine Phosphatases / Q000302:isolation & purification / Q000378:metabolism*; D011518:Proto-Oncogene Proteins / Q000302:isolation & purification / Q000378:metabolism*; D051381:Rats; D020794:Receptor Protein-Tyrosine Kinases / Q000302:isolation & purification / Q000378:metabolism*; D020917:Receptor, trkA; D017475:Receptors, Nerve Growth Factor / Q000302:isolation & purification / Q000378:metabolism*; D054593:SH2 Domain-Containing Protein Tyrosine Phosphatases; D013997:Time Factors; D018909:src Homology Domains
chemical_list: D047908:Intracellular Signaling Peptides and Proteins; D009414:Nerve Growth Factors; D011518:Proto-Oncogene Proteins; D017475:Receptors, Nerve Growth Factor; D020794:Receptor Protein-Tyrosine Kinases; D020917:Receptor, trkA; D054592:Protein Tyrosine Phosphatase, Non-Receptor Type 11; D053824:Protein Tyrosine Phosphatase, Non-Receptor Type 6; D017027:Protein Tyrosine Phosphatases; C516727:Ptpn11 protein, rat; C509250:Ptpn6 protein, rat; D054593:SH2 Domain-Containing Protein Tyrosine Phosphatases