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The phorbol ester TPA (12-O-tetradecanoyl phorbol-13-acetate) causes a dose-dependent inhibition of the glucagon-stimulated adenylate cyclase activity expressed in plasma membranes isolated from TPA-treated hypatocytes. However, no observable inhibitory effect of TPA on adenylate cyclase activity was observed in cells which had been exposed to glucagon for 5 min, prior to isolation, to desensitise...
The ability of staurosporine, a potent inhibitor of protein kinase C, to block certain cellular events initiated by 12-O-tetradecanoylphorbol-13-acetate (TPA) and epidermal growth factor (EGF) was examined. Treatment of MDA468 breast cancer cells with TPA decreases EGF binding to the cell surface and this effect is blocked by pretreatment with staurosporine with an IC 50 of 30 nM. Either...
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