Src-mediated inter-receptor cross-talk between the Na+/K+-ATPase and the epidermal growth factor receptor relays the signal from ouabain to mitogen-activated protein kinases

The Journal of Biological Chemistry
Michael HaasZijian Xie

Abstract

Binding of ouabain to Na(+)/K(+)-ATPase activates tyrosine phosphorylation of the epidermal growth factor receptor (EGFR), Src, and p42/44 mitogen-activated protein kinases (MAPKs) in both cardiac myocytes and A7r5 cells. Here, we explored the roles of Src and the EGFR in the ouabain-invoked pathways that lead to the activation of MAPKs. Exposure of A7r5 and LLC-PK1 cells to ouabain caused a dose-dependent inhibition of Na(+)/K(+)-ATPase activity, which correlated well with ouabain-induced activation of Src and MAPKs in these cells. Immunoprecipitation experiments showed that ouabain stimulated Src binding to Na(+)/K(+)-ATPase in a dose- and time-dependent manner and increased phosphorylation of Src at Tyr(418) but had no effect on Tyr(529) phosphorylation. Ouabain failed to activate MAPKs in A7r5 cells that were pretreated with the Src inhibitor PP2 and in SYF cells in which Src family kinases are knocked out. Preincubation with AG1478, but not AG1295, also blocked the effects of ouabain on p42/44 MAPKs in A7r5 cells. Significantly, both herbimycin A and PP2 abrogated ouabain-induced but not epidermal growth factor-induced Src binding to the EGFR and the subsequent EGFR tyrosine phosphorylation. Ouabain also failed to affect t...Continue Reading

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