Suppression of the phosphorylation of receptor tyrosine phosphatase-alpha on the Src-independent site tyrosine 789 by reactive oxygen species

Molecular Pharmacology
Qin HaoHua Tang

Abstract

Oxidation of receptor protein tyrosine phosphatase-alpha (RPTPalpha) is emerging as an important yet poorly characterized regulatory mechanism for RPTPalpha signaling in cells. RPTPalpha has been shown to be reversibly oxidized and inhibited by reactive oxygen species. However, it is not known whether oxidative stress could regulate the phosphorylation of Tyr789, a critical tyrosine residue for RPTPalpha signaling that modulates the function of Grb2 and the activation of Src family kinases. In the present study, we have taken advantage of a phosphospecific antibody against Tyr789-phosphorylated RPTPalpha and characterized the phosphorylation of RPTPalpha Tyr789 in various cultured cells, including SYF cells lacking all three ubiquitously expressed members (Src, Yes, and Fyn) of Src family kinases. We have obtained substantial evidence indicating that the phosphorylation of RPTPalpha Tyr789 is regulated predominantly by an Src kinase inhibitor, protein phosphatase 1 (PP1)-sensitive but Src/Yes/Fyn-independent tyrosine kinase, in cells. We further reported a novel finding that, besides the inhibition of RPTPalpha's activity, H(2)O(2) at low to moderate concentrations (50-250 microM) markedly suppressed the phosphorylation of RPTP...Continue Reading

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Citations

Jul 4, 2006·Free Radical Biology & Medicine·Qin HaoHua Tang

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