Folic acid supplementation lowers blood arsenic

被引:170
|
作者
Gamble, Mary V.
Liu, Xinhua
Slavkovich, Vesna
Pisner, J. Richard
Ilievski, Vesna
Factor-Litvak, Pam
Levy, Diane
Alam, Shafiul
Islam, Mominul
Parvez, Faruque
Ahsan, Habibul
Graziano, Joseph H.
机构
[1] Columbia Univ, Mailman Sch Publ Hlth, Dept Environm Hlth Sci, New York, NY 10032 USA
[2] Columbia Univ, Mailman Sch Publ Hlth, Dept Biostat, New York, NY USA
[3] Columbia Univ, Mailman Sch Publ Hlth, Dept Epidemiol, New York, NY USA
[4] Columbia Univ, Arsen Project Bangladesh, Dhaka, Bangladesh
[5] Univ Chicago, Dept Hlth Sci, Chicago, IL 60637 USA
[6] Columbia Univ, Coll Phys & Surg, Dept Pharm, New York, NY USA
来源
AMERICAN JOURNAL OF CLINICAL NUTRITION | 2007年 / 86卷 / 04期
关键词
folic acid; folate deficiency; homocysteine; S-adenosylmethionine; SAM; creatinine; arsenic; monomethylarsonic acid; dimethylarsinic acid; blood arsenic;
D O I
10.1093/ajcn/86.4.1202
中图分类号
R15 [营养卫生、食品卫生]; TS201 [基础科学];
学科分类号
100403 ;
摘要
Background: Chronic arsenic exposure currently affects > 100 million persons worldwide. Methylation of ingested inorganic arsenic (InAs) to monomethyl arsonic (MMAs) and dimethylarsinic (DMAs) acids relies on folate-dependent one-carbon metabolism and facilitates urinary arsenic elimination. Objective: We hypothesized that folic acid supplementation to arsenic-exposed Bangladeshi adults would increase arsenic methylation and thereby lower total blood arsenic. Design: In this randomized, double-blind, placebo-controlled trial, we evaluated blood concentrations of total arsenic, InAs, MMAs, and DMAs in 130 participants with low plasma folate (<9 nmol/L) before and after 12 wk of supplementation with folic acid (400 mu g/d) or placebo. Results: MMAs in blood was reduced by a mean +/- SE of 22.24 +/- 2.86% in the folic acid supplementation group and by 1.24 +/- 3.59% in the placebe group (P < 0.0001). There was no change in DMAs in blood; DMAs is rapidly excreted in urine as evidenced by an increase in urinary DMAs (P = 0.0099). Total blood arsenic was reduced by 13.62% in the folic acid supplementation group and by 2.49% in the placebo group (P = 0.0199). Conclusions: Folic acid supplementation to participants with low plasma concentrations of folate lowered blood arsenic concentrations, primarily by decreasing blood MMAs and increasing urinary DMAs. Therapeutic strategies to facilitate arsenic methylation, particularly in populations with folate deficiency or hyperhomocysteinemia or both, may lower blood arsenic concentrations and thereby contribute to the prevention of arsenic-induced illnesses.
引用
收藏
页码:1202 / 1209
页数:8
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