Changes in urinary arsenic methylation profiles in a 15-year interval after cessation of arsenic ingestion in Southwest Taiwan

Yung-Kai Huang, Ya-Li Huang, Yu-Mei Hsueh, Jimmy Tse Jen Wang, Mo Hsiung Yang, Chien Jen Chen

研究成果: 雜誌貢獻文章

17 引文 斯高帕斯(Scopus)

摘要

BACKGOUND: Inorganic arsenic (iAs) is carcinogenic to humans. Methylated metabolites of arsenic (As) found in the urine could serve as potential tools for screening and early detection of cancer in populations exposed to As. Relatively little information is available regarding changes in As methylation profiles after cessation of As exposure. OBJECTIVE: We examined the changes in urinary arsenic (uAs) species profiles over 15 years in a cancer-free population that has ceased heavy and prolonged ingestion of As. METHODS: In 1989, a cohort study was carried out with 1,081 adults who resided in three villages in southwestern Taiwan where arseniasis was hyperendemic. After 15 years of follow-up, a subgroup of 205 cancer-free participants had completed all interviews and had uAs methylation data available. We used this group in our statistical analysis. Arsenic species were measured by high-performance liquid chromatography-hydride generation-atomic absorption spectrometry. RESULTS: We compared the initial analyses from 1989 with those performed 15 years later and found that the average differences for the proportion of urinary iAs, monomethylarsonic acid (MMAV), and dimethylarsinic acid (DMAV) were -4.90%, -6.80%, and 11.69%, respectively. The elderly and those residents with longer periods of consuming high-As artesian well water exhibited greater changes (decreases) in %MMAV. CONCLUSION: The As methylation profiles indicate increased efficiency in As metabolism in residents after cessation of long-term exposure to high-level As. Moreover, the decreased %MMAV was more pronounced in the elderly cancer-free subcohort subjects.
原文英語
頁(從 - 到)1860-1866
頁數7
期刊Environmental Health Perspectives
117
發行號12
DOIs
出版狀態已發佈 - 十二月 2009

    指紋

ASJC Scopus subject areas

  • Health, Toxicology and Mutagenesis
  • Public Health, Environmental and Occupational Health

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