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. 1989 Jan 15;257(2):407–411. doi: 10.1042/bj2570407

Effects of oestrogen on adenylate cyclase system and glucose output in rat liver.

S Shima 1, N Okeyama 1, N Akamatu 1
PMCID: PMC1135594  PMID: 2539086

Abstract

Effects of chronic oestrogen treatment on catecholamine- and glucagon-sensitive adenylate cyclase activity and glucose output in hepatocytes of castrated male rats were studied. In hepatocytes from male intact or castrated rats, the beta-adrenergic agonist isoprenaline did not stimulate adenylate cyclase activity and glycogenolysis, but glucagon markedly stimulated all these activities. Treatment of castrated animals with 17 beta-oestradiol for 7 days led to the appearance of beta-adrenergic-stimulated increases in both cyclic AMP generation and glucose output. The basal, glucagon- or fluoride-stimulated activities of adenylate cyclase of hepatic membranes prepared from oestrogen-treated rats were similar to those of control animals. Treatment with oestrogen did not influence the number or affinity of beta-adrenergic receptors. In hepatic plasma membranes from control rats, GTP failed to decrease the affinity of beta-adrenergic receptors for agonists, whereas the GTP-induced shift was apparently observed in those from oestrogen-treated animals. These results suggest that oestrogen is able to facilitate the coupling of hepatic beta-adrenergic receptors to the enzyme by increasing the effectiveness of receptor-guanine nucleotide regulation.

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Selected References

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