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Effect of 17beta-estradiol in hypercholesterolemic rabbits with severe endothelial dysfunction
C A Nascimento1, K Kauser, G M Rubanyi
1University of Sao Paulo, Sao Paulo, Brazil 01246-903.
The American Journal of Physiology
|May 18, 1999
Summary
17beta-Estradiol, a form of estrogen, reduces atherosclerosis development, even with severe endothelial dysfunction. This hormone therapy may offer protection against cardiovascular disease by increasing nitric oxide production.
Area of Science:
- Cardiovascular Science
- Endocrinology
- Pharmacology
Background:
- Advanced atherosclerosis is often associated with endothelial dysfunction.
- Estrogen's role in preventing early vascular lesions is known, but its effect on advanced disease with endothelial dysfunction requires further investigation.
Purpose of the Study:
- To investigate the antiatherosclerotic effects of 17beta-estradiol in a rabbit model of advanced atherosclerosis with severe endothelial dysfunction.
Main Methods:
- Hypercholesterolemic rabbits were treated with Nomega-nitro-L-arginine methyl ester (L-NAME) to induce endothelial dysfunction and accelerate atherosclerosis.
- The effects of 17beta-estradiol treatment, alone and in combination with L-NAME, on aortic lesion development and endothelial nitric oxide (EDNO)-mediated responses were assessed.
Main Results:
- L-NAME administration accelerated atherosclerotic plaque development and impaired EDNO-mediated responses.
- 17beta-estradiol treatment inhibited aortic lesion formation and increased EDNO production, independent of serum cholesterol levels.
- The protective effect of 17beta-estradiol persisted even in the presence of L-NAME-induced endothelial dysfunction.
Conclusions:
- 17beta-estradiol exhibits antiatherosclerotic effects, potentially through both NO-dependent and NO-independent mechanisms.
- Estrogen therapy may offer cardiovascular protection in patients with severe endothelial dysfunction, suggesting a therapeutic potential for advanced atherosclerosis.