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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1992 Dec 1;89(23):11259–11263. doi: 10.1073/pnas.89.23.11259

Basal release of nitric oxide from aortic rings is greater in female rabbits than in male rabbits: implications for atherosclerosis.

T Hayashi 1, J M Fukuto 1, L J Ignarro 1, G Chaudhuri 1
PMCID: PMC50529  PMID: 1454805

Abstract

Estradiol is known to exert a protective effect against the development of atherosclerosis, but the mechanism of this hormonal action is unknown. One of the early events in the development of atherosclerosis is the adhesion of macrophages to endothelial cells, and nitric oxide (NO) inhibits this process. We show that basal release of NO is greater with endothelium-intact aortic rings from female rabbits than those from males. Oophorectomy diminishes both circulating estradiol concentration and basal release of NO to levels seen in male rabbits. These data establish that basal NO release from endothelium-intact aortic rings depends on circulating estradiol concentration and offer an explanation for the protective effect of estradiol against the development of atherosclerosis.

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Selected References

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