Determinants of arsenic methylation efficiency and urinary arsenic level in pregnant women in Bangladesh

Shangzhi Gao, Pi I. Lin, Golam Mostofa, Quazi Quamruzzaman, Mahmudur Rahman, Mohammad Lutfar Rahman, Li Su, Yu Mei Hsueh, Marc Weisskopf, Brent Coull, David Chistopher Christiani

研究成果: 雜誌貢獻文章同行評審

17 引文 斯高帕斯(Scopus)


Background: Prenatal inorganic arsenic (iAs) exposure is associated with pregnancy outcomes. Maternal capabilities of arsenic biotransformation and elimination may influence the susceptibility of arsenic toxicity. Therefore, we examined the determinants of arsenic metabolism of pregnant women in Bangladesh who are exposed to high levels of arsenic. Methods: In a prospective birth cohort, we followed 1613 pregnant women in Bangladesh and collected urine samples at two prenatal visits: one at 4-16 weeks, and the second at 21-37 weeks of pregnancy. We measured major arsenic species in urine, including iAs (iAs%) and methylated forms. The proportions of each species over the sum of all arsenic species were used as biomarkers of arsenic methylation efficiency. We examined the difference in arsenic methylation using a paired t-test between first and second visits. Using linear regression, we examined determinants of arsenic metabolism, including age, BMI at enrollment, education, financial provider income, arsenic exposure level, and dietary folate and protein intake, adjusted for daily energy intake. Results: Comparing visit 2 to visit 1, iAs% decreased 1.1% (p < 0.01), and creatinine-adjusted urinary arsenic level (U-As) increased 21% (95% CI: 15, 26%; p < 0.01). Drinking water arsenic concentration was positively associated with iAs% at both visits. When restricted to participants with higher adjusted urinary arsenic levels (adjusted U-As > 50 μg/g-creatinine) gestational age at measurement was strongly associated with DMA% (β = 0.38, p < 0.01) only at visit 1. Additionally, DMA% was negatively associated with daily protein intake (β = - 0.02, p < 0.01) at visit 1, adjusting for total energy intake and other covariates. Conclusions: Our findings indicate that arsenic metabolism and adjusted U-As level increase during pregnancy. We have identified determinants of arsenic methylation efficiency at visit 1.
期刊Environmental Health: A Global Access Science Source
出版狀態已發佈 - 11月 5 2019

ASJC Scopus subject areas

  • 公共衛生、環境和職業健康
  • 健康、毒理學和誘變


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