微粒体环氧化物水化酶基因多态性对焦炉工尿中1-羟基芘水平的影响

目的　研究外源性化学物代谢酶基因多态性与焦炉工尿中 1 羟基芘水平的关系。方法　分别选取 14 8名焦炉工和 6 9名非职业多环芳烃 (PAHs)暴露人员作为研究对象 ,使用碱水解 -高效液相色谱法测定其尿中 1 羟基芘浓度 ;分析了CYP1A1基因第 7外显子I4 6 2V位点、GSTM1、GSTT1、GSTP1基因I10 5V位点、CYP2E1基因 5’非编码区的Pst1位点和第 6内含子的Dra1位点、NQO1基因P187S位点、NAT2基因Kpn1、BamH1和Taq1位点以及mEH基因H113Y和R139H位点的多态性 ;使用调查表收集个人职业暴露史、年龄、性别、吸烟和饮酒等信息。结果　焦炉工尿中 1 羟基芘水平(5 .6 1± 1.0 4 ) μmol molCr]高于对照组 (0 .74± 0 .32 ) μmol molCr],差异有显著性 (P <0 .0 5 )。调整了PAHs外暴露等级和吸烟因素后 ,焦炉工中具有mEH基因 113位点变异纯合子基因型个体尿中1 羟基芘水平高于杂合子和野生型纯合子 (6 .4 1± 1.0 9>6 .2 4± 1.0 9>4 .6 2± 0 .95 μmol molCr) ,且野生型纯合子与变异型纯合子基因型个体间尿中 1 羟基芘水平的差异有显著性 (P <0 .0 5 )。在焦炉工中还发现CYP1A1和mEH基因多态性存在交互作用。结论　mEH基因 113位点的基因多态性可明显影响焦炉工尿中 1 羟基芘水平。

Effect of genetic polymorphisms of microsomal epoxide hydrolase on urinary 1-hydroxypyrene levels in coke oven workers

OBJECTIVE: To investigate the associations of polymorphisms of metabolic enzyme genes with urinary 1-hydroxypyrene levels in coke oven workers. METHODS: One hundred and forty-eight workers from a coke oven plant and 69 controls without occupational PAHs exposure were selected in this study. Urinary 1-hydroxypyrene was detected by high performance liquid chromatography with florescence detector. The genotypes at I462V site in exon 7 of CYP1A1 gene, GSTM1, GSTT1, I105V site in GSTP1gene, Pst1 and Dra1 sites in CYP2E1 gene, P187S site in NQO1 gene, Kpn1, BamH1 and Taq1 sites in NAT2 gene, and H113Y, R139H sites in mEH gene were determined by PCR-based methods. Personal information including occupational exposure history, age, sex, smoking and drinking status was collected by the questionnaire. RESULTS: The level of urinary 1-hydroxypyrene in coke oven workers (5.61 +/- 1.04) mol/mol Cr] was higher than that in control (0.74 +/- 0.32) micro mol/mol Cr]. After adjusting external occupational exposure category and smoking, coke oven workers with variant homozygotes at H113Y site of mEH gene had significantly higher urinary 1-hydroxypyrene concentrations than those with heterozygotes, and wild homozygotes (6.41 +/- 1.09 vs. 6.24 +/- 1.08, and 4.62 +/- 0.95 micro mol/mol Cr, P < 0.05), and gene-gene interaction was found between CYP1A1 and mEH. CONCLUSION: Genetic polymorphism of mEH gene could be a susceptible biomarker in coke oven workers which was involved in the individual susceptibility on metabolism of PAHs.