卟啉作为人体早期砷暴露生物标志的研究

采用氢化物发生原子吸收分析了贵州省燃煤污染型砷中毒区和非砷中毒区（对照）居民尿样中砷浓度,采用高效液相色谱法分析了卟啉浓度,考察了燃煤污染造成的人体砷暴露与尿液中卟啉排泄改变的关系,寻求慢性砷中毒早期健康效应的生物标志物.结果显示,与对照组相比,砷暴露组尿卟啉Ⅲ（uroporphyrin-Ⅲ）和粪卟啉Ⅲ（coproporphyrin-Ⅲ）显著增高（P＜0.01,P＜0.01）,粪卟啉Ⅰ（coproporphyrin-Ⅰ）比对照组增高,但不显著;不同性别组间比较,对照组和暴露组的中龄（20～40岁）群体尿液中,尿卟啉Ⅲ的浓度在男性和女性群体之间呈显著性的差异（P<0.01）,其它年龄组中,这一指标在不同性别群体之间未见显著性差异;不同年龄分层比较,低龄组（＜20岁）尿卟啉Ⅲ和粪卟啉Ⅲ比对照显著增高（P＜0.01,P＜0.01）,中龄组（20～40岁）和高龄组（＞40岁）粪卟啉Ⅲ比对照显著增高（P＜0.05,P＜0.05）;此外,砷暴露组尿液中砷与总粪卟啉和总卟啉呈正相关（r=0.623,r=0.549）.结果表明,人体砷暴露会导致尿液中卟啉排泄的改变,提示卟啉有可能作为慢性砷中毒早期健康效应的生物标志.

Porphyrins as the Early Biomarkers for Arsenic Exposure of Human

To investigate the effects of arsenic exposure on porphyrins excretion profiles in human, porphyrins were measured by HPLC and total arsenic by HG-AAS in urine samples collected from arsenicosis-endemic areas and control sites in Guizhou Province. Analytical data showed that urinary uroporphyrin-III and coproporphyrin-III were significantly elevated in arsenic-exposed group compared with those in control group, while urinary coproporphyrin-I was not significantly higher in arsenic-exposed group than that in control group. Not any significant difference was found in porphyrins between the male and female except for 20-40 years age group. As far as age was concerned, arsenic-exposed group of <20 years showed significant increases in uroporphyrin-III and coproporphyrin-III compared with the control group of <20 years. Similarly, arsenic-exposed groups of 20-40 years and >40 years also showed significant increases in coproporphyrin-III compared with corresponding age groups of control. Besides, there were positive correlations between the urinary arsenic and total coproporphyrin, and total porphyrin. The effects of arsenic exposure were associated with increased porphyrins excretion, which was suggested that porphyrins were possible to be used as biomarkers of early health effect due to arsenicosis.