Abstract:
BACKGROUND:Previous studies have found polymorphisms of the HDL receptor, SR-BI, to be associated with plasma HDL-C in women, but not men, suggesting a modifying role of estrogen. We examined whether the association between SR-BI genotypes and HDL-C is modified by use of unopposed estrogen in community-dwelling postmenopausal Caucasian women. METHODS:Common polymorphisms in Intron5 and Exon8 of the SR-BI gene were evaluated in 689 women from the Rancho Bernardo Study. Multiple linear regression analysis was carried out adjusting for confounders. RESULTS:HDL-C levels did not differ significantly by genotype in the aggregate population. However, significant interaction was found between estrogen use and Exon8 (p=0.03), Intron5 (p=0.03) and Intron5/Exon8 diplotypes (p=0.01). SR-BI genotype was associated with HDL-C levels only among estrogen users (p=0.05) and explained 5.3% of the variance in HDL-C in this group. Consistent with prior studies, individuals heterozygous at both Intron5 and Exon8 loci had the lowest HDL-C levels. Among women with symptomatic CHD, the interaction between estrogen use and SR-BI genotype became even stronger. CONCLUSIONS:The effect that unopposed estrogen use has on HDL-C may depend on a woman's SR-BI genotype.
journal_name
Atherosclerosisjournal_title
Atherosclerosisauthors
Richard E,von Muhlen D,Barrett-Connor E,Alcaraz J,Davis R,McCarthy JJdoi
10.1016/j.atherosclerosis.2004.12.013keywords:
subject
Has Abstractpub_date
2005-06-01 00:00:00pages
255-62issue
2eissn
0021-9150issn
1879-1484pii
S0021-9150(04)00648-3journal_volume
180pub_type
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