Influence of apolipoprotein E genotype on fat-soluble plasma antioxidants in Spanish children - PubMed (original) (raw)
Multicenter Study
doi: 10.1093/ajcn/81.3.624.
Affiliations
- PMID: 15755832
- DOI: 10.1093/ajcn/81.3.624
Free article
Multicenter Study
Influence of apolipoprotein E genotype on fat-soluble plasma antioxidants in Spanish children
Henar Ortega et al. Am J Clin Nutr. 2005 Mar.
Free article
Abstract
Background: Apolipoprotein (apo) E is a major determinant of plasma lipid concentrations, which in turn influence the plasma concentrations of various fat-soluble vitamins.
Objective: We aimed to analyze the effect of APOE genotype on fat-soluble antioxidant concentrations in children.
Design: A total of 926 healthy boys and girls aged 6-8 y were selected from 4 cities in Spain. APOE genotyping was carried out, and plasma concentrations of lipids, apolipoproteins, and lipid-soluble antioxidants were measured.
Results: Plasma lipid concentrations were strongly influenced by APOE genotype. The mean plasma concentration of alpha-tocopherol was 21.3 micromol/L, which is one of the highest values ever reported for a population of children. Although plasma concentrations of alpha-tocopherol, gamma-tocopherol, lycopene, and alpha-carotene varied significantly between subjects with different APOE genotypes, most of these differences disappeared after adjustment for lipoprotein-related covariates. Nevertheless, tocopherol concentrations remained elevated in individuals with the E2/2 genotype. Multivariate regression analysis showed interactions of APOE genotype with triacylglycerol and apo B in determining alpha-tocopherol concentrations. When subjects were stratified according to major apo E groups, apo B appeared to be the most important predictor of alpha-tocopherol concentrations in all groups, whereas triacylglycerol was identified only in carriers of the E2 allele.
Conclusions: The association between APOE genotype and lipophilic antioxidant concentrations is dependent mainly on the effect of the polymorphism on lipoprotein concentrations. However, triacylglycerol plays a role in determining the variability of alpha-tocopherol concentrations in E2 carriers only. This suggests that the alpha-tocopherol content in each lipoprotein class varies according to APOE genotype.
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