Phorbol 12-myristate 13-acetate (PMA) inhibited the stimulation of ureogenesis produced by adrenaline, but produced a minimal displacement to the right of the dose-response curve for glucagon. However, PMA diminished the accumulation of cyclic AMP induced by glucagon. Dissociation between the cyclic AMP concentrations and the metabolic effects induced by glucagon is evidenced in the presence of phorbol esters.

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