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  • Title: Insulin as an activator of cyclic AMP accumulation in rat fat cells.
    Author: Fain JN.
    Journal: J Cyclic Nucleotide Res; 1975; 1(5):359-66. PubMed ID: 178697.
    Abstract:
    In rat fat cells incubated with lipolytic agents and insulin for 30 or 60 minutes the increase in cyclic AMP accumulation due to norepinephrine and theophylline or adenosine deaminase added during the last 2-5 minutes of the incubation period was much greater as compared to cells incubated in the absence of insulin. Protaglandin E1 or nicotinic acid were just as anti-lipolytic as insulin but prior incubation with these agents markedly decreased the subsequent rise in cyclic AMP accumulation due to late catecholamine addition. The ability of insulin to increase cyclic AMP accumulation appeared to be secondary to inhibition of lipolysis. These results indicate that prostaglandin E1 and nicotinic acid are inhibitors of cyclic AMP accumulation while insulin acts by another mechanism to reduce lipolysis.
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