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- W1545815557 abstract "We have shown previously that the alpha subunit of the stimulatory GTP binding regulatory component of adenylyl cyclase (Gs alpha) mediates epidermal growth factor (EGF)-elicited stimulation of rat cardiac adenylyl cyclase (Nair et al., J Biol Chem 265: 21317-21322, 1990). Employing purified protein phosphotyrosine phosphatase, and benzylidene derivatives (tyrphostins: compounds 11 and 12) that selectively inhibit EGF receptor protein tyrosine kinase (EGFRK) activity, the role of EGFRK in EGF-mediated stimulation of cardiac adenylyl cyclase was investigated. The ability of the tyrphostins to inhibit the EGFRK activity in cardiac membranes was determined by monitoring tyrosine phosphorylation of either the 170 kDa protein or immunoprecipitated EGF receptor at 0 degrees and room temperature, respectively. Compounds 11 and 12, in a concentration-dependent manner, inhibited EGF receptor tyrosine kinase activity. In assays of adenylyl cyclase activity neither compound 11 nor compound 12 altered Gpp(NH)p- or isoproterenol-stimulated activity. However, both compounds, in a concentration-dependent manner, attenuated the ability of EGF to stimulate adenylyl cyclase activity without altering specific binding of [125I]EGF to cardiac membranes. Similarly, protein phosphotyrosine phosphatase obliterated the ability of EGF, but not isoproterenol, to stimulate adenylyl cyclase. Thus, we conclude that protein tyrosine kinase activity of the EGF receptor is essential for the stimulation of cardiac adenylyl cyclase by EGF." @default.
- W1545815557 created "2016-06-24" @default.
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- W1545815557 date "1993-10-01" @default.
- W1545815557 modified "2023-09-26" @default.
- W1545815557 title "Regulation of cardiac adenylyl cyclase by Epidermal Growth Factor (EGF)" @default.
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- W1545815557 doi "https://doi.org/10.1016/0006-2952(93)90473-a" @default.
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