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The purpose of this study is to determine whether folic acid, alone or together with creatine supplementation, can lower blood arsenic concentrations and improve the ability to detoxify arsenic.
Approximately 140 million people in over 70 countries are chronically exposed to arsenic (As)-contaminated drinking water at concentrations far exceeding the World Health Organization standard of 10 µg/L. As is a carcinogen known to cause cancers of the skin, bladder, and lung, as well as ischemic heart disease and neurologic impairments. Methylation of ingested inorganic arsenic (InAs) to methylarsonic-(MMA) and dimethylarsinic acids (DMA) relies on folate-dependent one carbon metabolism, utilizing S-adenosylmethionine (SAM) as the methyl donor, and facilitates urinary As elimination. The results from our Nutritional Influences on Arsenic Toxicity (NIAT) study indicate that folate deficiency and hyperhomocysteinemia (HHcys) are associated with a reduced capacity to methylate arsenic and are risk factors for arsenic-induced skin lesions. Furthermore, folic acid (FA) supplementation does indeed facilitate As elimination and significantly lowers blood As concentrations in individuals who are folate deficient. We have also determined that blood As is a good biomarker of As exposure and is directly associated with the risk for As-induced skin lesions. Collectively, the implication of these findings is that FA has enormous therapeutic potential for ameliorating the long-term health consequences of arsenic exposure for the many populations at risk. However, several fundamental questions remain and will be addressed in this study. This trial is designed to determine 1) whether FA supplementation lowers blood As concentrations in the general Bangladeshi population, 2) at what time point a nadir in blood As is achieved, and 3) whether creatine supplementation, alone or in addition to 400 µg/d FA, will spare methyl groups, resulting in lower blood As, lower homocysteine (Hcys) concentrations, and increased methylation of As. The creatine arms are based on multiple studies that show that urinary creatinine concentrations are a very strong predictor of As methylation. The final step in creatine biosynthesis is the methylation of guanidinoacetate to creatine; this process consumes 50-75% of all SAM-derived methyl groups and is also responsible for 50-75% of all Hcys biosynthesis. Thus, this trial will test the hypothesis that creatine supplementation, which shuts down endogenous creatine biosynthesis, will spare methyl groups, lower Hcys, and increase As methylation.
Allocation: Randomized, Control: Placebo Control, Endpoint Classification: Efficacy Study, Intervention Model: Parallel Assignment, Masking: Double Blind (Subject, Caregiver, Investigator, Outcomes Assessor), Primary Purpose: Prevention
High Blood Arsenic Due to Chronic Arsenic Exposure
Placebo, folic acid, folic acid, creatine, creatine + folic acid
Columbia University Arsenic Research Project
Not yet recruiting
Published on BioPortfolio: 2014-08-27T03:16:34-0400
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The active metabolite of FOLIC ACID. Leucovorin is used principally as its calcium salt as an antidote to folic acid antagonists which block the conversion of folic acid to folinic acid.
Cell surface receptors that bind to and transport FOLIC ACID, 5-methyltetrahydrofolate, and a variety of folic acid derivatives. The receptors are essential for normal NEURAL TUBE development and transport folic acid via receptor-mediated endocytosis.
Derivatives of folic acid (pteroylglutamic acid). In gamma-glutamyl linkage they are found in many tissues. They are converted to folic acid by the action of pteroylpolyglutamate hydrolase or synthesized from folic acid by the action of folate polyglutamate synthetase. Synthetic pteroylpolyglutamic acids, which are in alpha-glutamyl linkage, are active in bacterial growth assays.
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Proteins involved in the transport of FOLIC ACID and folate derivatives across the CELLULAR MEMBRANE.
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