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• W2908268082 abstract "Higher circulating antioxidant concentrations are associated with a lower risk of late-onset Alzheimer disease (AD) in observational studies, suggesting that diet-sourced antioxidants may be modifiable targets for reducing disease risk. However, observational evidence is prone to substantial biases that limit causal inference, including residual confounding and reverse causation.In order to infer whether long-term circulating antioxidant exposure plays a role in AD etiology, we tested the hypothesis that AD risk would be lower in individuals with lifelong, genetically predicted increases in concentrations of 4 circulating antioxidants that are modifiable by diet.Two-sample Mendelian randomization analyses were conducted. First, published genetic association studies were used to identify single-nucleotide polymorphisms (SNPs) that determine variation in circulating ascorbate (vitamin C), β-carotene, retinol (vitamin A), and urate. Second, for each set of SNP data, statistics for genotype associations with AD risk were extracted from data of a genome-wide association study of late-onset AD cases and controls (n = 17,008 and 37,154, respectively). Ratio-of-coefficients and inverse-variance-weighted meta-analyses were the primary methods used to assess the 4 sets of SNP-exposure and SNP-AD associations. Additional analyses assessed the potential impact of bias from pleiotropy on estimates.The models suggested that genetically determined differences in circulating ascorbate, retinol, and urate are not associated with differences in AD risk. All estimates were close to the null, with all ORs for AD ≥1 per unit increase in antioxidant exposure (ranging from 1.00 for ascorbate to 1.05 for retinol). There was little evidence to imply that pleiotropy had biased results.Our findings suggest that higher exposure to ascorbate, β-carotene, retinol, or urate does not lower the risk of AD. Replication Mendelian randomization studies could assess this further, providing larger AD case-control samples and, ideally, using additional variants to instrument each exposure." @default.
• W2908268082 created "2019-01-11" @default.
• W2908268082 creator A5011350655 @default.
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• W2908268082 date "2019-01-01" @default.
• W2908268082 modified "2023-10-14" @default.
• W2908268082 title "Circulating antioxidants and Alzheimer disease prevention: a Mendelian randomization study" @default.
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• W2908268082 doi "https://doi.org/10.1093/ajcn/nqy225" @default.
• W2908268082 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6358036" @default.
• W2908268082 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/30596810" @default.
• W2908268082 hasPublicationYear "2019" @default.
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