Arsenic metabolism and one-carbon metabolism at low-moderate arsenic exposure: Evidence from the Strong Heart Study. (July 2017)

• Record Type: Journal Article
• Authors: Spratlen, Miranda Jones; Gamble, Mary V.; Grau-Perez, Maria; Kuo, Chin-Chi; Best, Lyle G.; Yracheta, Joseph; Francesconi, Kevin; Goessler, Walter; Mossavar-Rahmani, Yasmin; Hall, Meghan; Umans, Jason G.; Fretts, Amanda; Navas-Acien, Ana
• Is Part Of: Food and chemical toxicology. Volume 105(2017)
• Page Start: 387
• Page End: 397
• Publication Date: 2017-07
• Subjects: Arsenic metabolism -- Strong Heart Study -- One-carbon metabolism -- Dietary intake -- B-vitamins; Toxicology -- Periodicals; Food poisoning -- Periodicals; Food Poisoning -- Periodicals; Toxicology -- Periodicals; Toxicologie -- Périodiques; Intoxications alimentaires -- Périodiques; Food poisoning; Toxicology; Periodicals; Electronic journals; 615.9
• DOI: 10.1016/j.fct.2017.05.004
• Languages: English
• ISSNs: 0278-6915

Abstract

Abstract: B-vitamins involved in one-carbon metabolism (OCM) can affect arsenic metabolism efficiency in highly arsenic exposed, undernourished populations. We evaluated whether dietary intake of OCM nutrients (including vitamins B2, B6, folate (B9), and B12) was associated with arsenic metabolism in a more nourished population exposed to lower arsenic than previously studied. Dietary intake of OCM nutrients and urine arsenic was evaluated in 405 participants from the Strong Heart Study. Arsenic exposure was measured as the sum of iAs, monomethylarsonate (MMA) and dimethylarsenate (DMA) in urine. Arsenic metabolism was measured as the individual percentages of each metabolite over their sum (iAs%, MMA%, DMA%). In adjusted models, increasing intake of vitamins B2 and B6 was associated with modest but significant decreases in iAs% and MMA% and increases in DMA%. A significant interaction was found between high folate and B6 with enhanced arsenic metabolism efficiency. Our findings suggest OCM nutrients may influence arsenic metabolism in populations with moderate arsenic exposure. Stronger and independent associations were observed with B2 and B6, vitamins previously understudied in relation to arsenic. Research is needed to evaluate whether targeting B-vitamin intake can serve as a strategy for the prevention of arsenic-related health effects at low-moderate arsenic exposure. Highlights: Greater intake of one-carbon metabolism (OCM) vitamins B6 and B2, was associated with arsenic metabolism (ASM) efficiency. In principal component (PC) analyses, the PC reflecting greater OCM vitamin intake was also associated with enhanced ASM. High vitamin B6 and B2 intake had an additive effect on ASM efficiency. High folate with low B6 was associated with reduced ASM, but high intake of both vitamins was associated with enhanced ASM.