细胞色素P450 CYP2C9基因多态性对甲苯磺丁脲代谢动力学的影响

目的研究细胞色素P450 CYP2C9基因多态性对甲苯磺丁脲代谢动力学的影响。方法用基因芯片对137名健康志愿者进行CYP2C9基因多态性检测，将受试者分为CYP2C9野生型、杂合突变型和纯合突变型3组，用高效液相色谱法检测甲苯磺丁脲在受试者体内的药物代谢动力学参数，统计分析各组间药代动力学性质差异。结果在137名受试者中发现了9个CYP2C9*1/*3杂合型突变体和1个CYP2C9*3/*3纯合型突变体，其余为野生型个体。将9名CYP2C9*1/*3，1名CYP2C9*3/*3以及随机抽取的10名野生型个体分组，以甲苯磺丁脲为探药进行药物代谢动力学研究。结果在杂合型突变个体组以及纯合型突变个体组中，甲苯磺丁脲的代谢率显著低于对照的野生型个体组。结论CYP2C9基因多态性对甲苯磺丁脲代谢具有显著影响并呈基因剂量效应，检测突变型个体对指导临床合理用药和个体化医疗具有重要意义。

Influence of cytochrom P450 CYP2C9 polymorphism on the pharmacokinetics of tolbutamide metabolism using oligonucleotide genotyping microarray

Aim To investigate the influence of cytochrom P450 CYP2C9 polymorphism on the pharmacokinetics of tolbutamide. Methods An oligonucleotide microarray was designed and fabricated to genotype the CYP2C9 accurately and quickly. 137 healthy volunteers were genotyped with the array to investigate the frequency of CYP2C9 functional SNPs. Moreover, 1 homozygous mutant, 9 heterozygous and 10 wild-genotypes subjects in the assay were selected randomly and sequenced directly. After orally taking tolbutamide, blood samples and urine samples were collected, and their pharmacokinetics was studied with HPLC. Results CYP2C9*1/*3 were found in 9 of 137 volunteers, CYP2C9*3/*3 in only one, others were all CYP2C9*1/*1 wild types. CYP2C9*2, CYP2C9*4 and CYP2C9*5 alleles were not detected. Direct sequencing of the purified PCR products of the heterozygotes, mutant homozygotes and ten wild type individuals gave a corresponding result to that genotyped by microarray. Pharmacokinetic outcome showed that the individuals with CYP2C9*1/*3 or CYP2C9*3/*3 had slower metabolic elimination of tolbutamide than those with CYP2C9*1/*1. Conclusion CYP2C9 genetic polymorphism has a significant influence on the pharmacokinetics of tolbutamide. Pharmacogenomic study will be helpful in guiding rational and individualized medication.