[Study of relationship between arsenic methylation and skin lesion in a population with long-term high arsenic exposure].
OBJECTIVE
To investigate the difference of arsenic metabolism in populations with long-term high arsenic exposure and explore the relationship between arsenic metabolism diversity and skin lesion.


METHODS
327 residents in an arsenic polluted village were voluntarily enrolled in this study. Questionnaire survey and medical examination were carried out to learn basic information and detect skin lesions. Urinary inorganic and methylated arsenic were speciated by high performance liquid chromatography combined with hydride-generation atomic fluorescence spectrometry. Total arsenic concentration in hair was determined with DDC-Ag method.


RESULTS
Hair arsenic content of studied polutions was generally high, but no significant difference were found among the studied four groups. MMA and DMA concentration in urine increased with studied polution age, and were positively related with skin lesion grade. The relative proportion of MMA in serious skin lesion group was significantly higher than in other 3 groups, while DMA/MMA ratio was significantly lower than control and mild group. The relative proportion of MMA was positively related with skin lesion grade, DMA/ MMA ratio was negatively related with skin lesion grade. Males could have higher arsenic cumulation and lower methylation capacity than those of females. The population of above 40 years old may have higher methylation capacity than those of adults below 40yeas old. Smokers and drinkers seemed lower methylation capacity than those of non-smokers and non-drinkers respectively.


CONCLUSIONS
The methylation of arsenic could affect by several factors, including age gender, smoking and drinking. Arsenic methylation copacity mey be associated with skin lesion induced by arsenic exposure.
Su
Liqin
L
Institute of Environmental Health and Related Product Safety, Chinese Center for Disease Control and Prevention, Beijing 100021, China.
Cheng
Yibin
Y
Lin
Shaobin
S
Wu
Chuanye
C
D000328:Adult; D000367:Age Factors; D000368:Aged; D001151:Arsenic / Q000378:metabolism / Q000633:toxicity*; D020261:Arsenic Poisoning / Q000150:complications* / Q000652:urine; D004781:Environmental Exposure / Q000009:adverse effects*; D005260:Female; D006801:Humans; D008297:Male; D008745:Methylation; D008875:Middle Aged; D012737:Sex Factors; D012871:Skin Diseases / Q000139:chemically induced* / Q000473:pathology; D011795:Surveys and Questionnaires; D013997:Time Factors
D001151:Arsenic