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. 1987 Nov;84(22):8115–8119. doi: 10.1073/pnas.84.22.8115

Role of insulin receptor phosphorylation in the insulinomimetic effects of hydrogen peroxide.

G R Hayes 1, D H Lockwood 1
PMCID: PMC299489  PMID: 3317401

Abstract

The oxidant H2O2 has many insulin-like effects in rat adipocytes. To determine whether these effects could be mediated by the tyrosine kinase activity of the insulin receptor, the ability of H2O2 to stimulate receptor phosphorylation in intact adipocytes and partially purified insulin receptors has been examined. Phosphorylation of the beta subunit of the insulin receptor was increased approximately 2-fold by treatment of intact cells with 3 mM H2O2, a concentration that maximally stimulates 2-deoxyglucose uptake. Stimulation of receptor phosphorylation was rapid, reaching maximal levels within 5 min, and preceded activation of glucose transport. Phosphoamino acid analysis of insulin receptors from H2O2-treated adipocytes showed that 32P incorporation into phosphotyrosine and phosphoserine residues of the beta subunit was enhanced. Furthermore, partially purified receptors from H2O2-treated cells exhibit increased tyrosine kinase activity, as measured by phosphorylation of the peptide Glu80Tyr20. In contrast, the direct addition of H2O2 to partially purified insulin receptors did not stimulate tyrosine kinase activity or insulin receptor autophosphorylation. This was not due to breakdown of H2O2 or oxidation of ATP or the required divalent cations. To define the factors involved in H2O2's effect, we have examined receptor phosphorylation in fat cell homogenates and purified plasma membranes. Although insulin stimulated receptor phosphorylation in both of these systems, H2O2 was only effective in the cell homogenates. These data demonstrate that, under certain conditions, H2O2 stimulates insulin receptor phosphorylation and tyrosine kinase activity, suggesting that the insulin-like effects of H2O2 may be mediated by stimulation of insulin receptor phosphorylation. This does not appear to be a direct effect of H2O2 on the insulin receptor and requires nonplasma membrane cellular constituents.

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