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- Title
Estrogen Replacement Attenuates Exaggerated Neointimal Hyperplasia Following Carotid Endarterectomy in Rats.
- Authors
Nyalala, John O.; Brown, Aliza T.; Luo, Shaoke; Deng, Hongju; Moursi, Mohammed M.
- Abstract
Background: To investigate whether estrogen may attenuate neointima formation in hyperhomocysteinemic rat carotid endarterectomy. Methods: Rats were divided into 6 groups: ovariectomized estradiol-treated homocysteine or chow; ovariectomized placebo-treated homocysteine or chow; intact placebo-treated homocysteine or chow. Chow served as controls while homocysteine served as exaggerated intimal hyperplasia. Prior to endarterectomy, rats were implanted with estradiol mini-pump or placebo, diets given 2 weeks before and after surgery. Homocysteine, estrogen, and neointimal hyperplasia were determined. Results: Homocysteine was elevated in homocysteine groups versus controls except in estradiol-treated group. Intimal hyperplasia increased in placebo-treated ovariectomized homocysteine versus intact group. Exaggerated intimal hyperplasia in placebo-treated ovariectomized homocysteine was reduced by estrogen and so was homocysteine. Estrogen replacement in ovariectomized homocysteine group reduced intimal hyperplasia to that of intact or ovariectomized controls. Conclusion: Estradiol treatment in this ovariectomized hyperhomocysteinemia carotid endarterectomy and resultant attenuation of homocysteine and neointima may have relevance to the beneficial effects of estrogen on hyperplastic response.
- Subjects
HYPERPLASIA; ANALYSIS of variance; ANIMAL experimentation; ESTRADIOL; HORMONE therapy; OVARIECTOMY; RATS; REGRESSION analysis; STATISTICS; T-test (Statistics); HOMOCYSTEINE; DATA analysis; DATA analysis software; DESCRIPTIVE statistics; CAROTID endarterectomy
- Publication
Vascular & Endovascular Surgery, 2011, Vol 45, Issue 8, p720
- ISSN
1538-5744
- Publication type
Article
- DOI
10.1177/1538574411418127