title: Phenotype distribution and gender-related differences of CYP2E1 activity in a Chinese population.
abstract: 1. The aim was to investigate the phenotype distribution characteristic and gender-related differences of CYP2E1 activity in a healthy Chinese population. 2. Two hundred and three healthy Chinese subjects (105 men, 98 women) were enrolled in this study. 3. CYP2E1 activity was determined by plasma 6-hydroxychlorzoxazone-to-chlorzoxazone concentration ratio (CHZ-MR) 4h after chlorzoxazone dosing. The concentrations of 6-hydroxychlorzoxazone and chlorzoxazone in plasma were detected by reversed-phase HPLC. 4. The results showed an almost 9-fold variation of CYP2E1 activity at a range of from 0.23 to 1.99. The coefficient of variation CY % was demonstrated with skewness and kurtosis of the ratios in the studied population were 44%, 0.96 and 1.10, respectively. 5. CYP2E1 activity was normally distributed in logarithmic form of 6-OH-CHZ/CHZ as evaluated by Kolmogorov-Smirnov test of normality (p = 0.20). Probit plots of the CYP2E1 activity index of men shifted to the right as compared with that of women. The mean CHZ-MR in men was significantly higher than that in women (0.76 +/- 0.30 versus 0.60 +/- 0.28, p < 0.001), and this difference still existed when normalized by weight (0.73 +/- 0.28 versus 0.66 +/- 0.32, p = 0.016). Body weight correlated positively with CYP2E1 activity in the total group(r < 0.212, p < 0.01).
authors.affiliation: Pharmacogenetics Research Institute, Xiang-Ya School of Medicine, Central South University, Changsha, Hunan 410078, PR China.
authors.forename: Xiao-Ping
authors.initials: XP
authors.lastname: Chen
authors.forename: Xing-Mei
authors.initials: XM
authors.lastname: Han
authors.forename: Chang-Hong
authors.initials: CH
authors.lastname: Jiang
authors.forename: Song-Lin
authors.initials: SL
authors.lastname: Huang
authors.forename: Zhao-Qian
authors.initials: ZQ
authors.lastname: Liu
authors.forename: Bing
authors.initials: B
authors.lastname: Zhu
authors.forename: Gan
authors.initials: G
authors.lastname: Zhou
authors.forename: Hong-Hao
authors.initials: HH
authors.lastname: Zhou
mesh_terms: D000293:Adolescent; D000328:Adult; D015992:Body Mass Index; D001835:Body Weight; D002753:Chlorzoxazone / Q000031:analogs & derivatives* / Q000097:blood / Q000494:pharmacology; D019392:Cytochrome P-450 CYP2E1 / Q000378:metabolism*; D005260:Female; D006801:Humans; D008297:Male; D010641:Phenotype; D011110:Polymorphism, Genetic; D012737:Sex Factors; D013997:Time Factors
chemical_list: C039289:6-hydroxychlorzoxazone; D019392:Cytochrome P-450 CYP2E1; D002753:Chlorzoxazone