3种肝源永生化细胞药物代谢酶表达差异比较研究（英文）

Comparative study of cytochrome P450 expression in three permanent human hepatocytes

目的比较3种人源肝永生化细胞LX-2,L02和HepG2药物代谢酶的表达差异,确定适合于特定细胞色素P450(CYP)亚型研究的细胞类型。方法体外培养人源传代肝细胞L02,LX-2和HepG2,以奥美拉唑(Ome)、地塞米松(Dex)、苯巴比妥钠(Phe)、异烟肼(Iso)和利福平(Rif)0,5,10,20和40 μmol·L^-1进行诱导。CCK-8法检测细胞存活,实时荧光定量PCR(RT-qPCR)法检测LX-2细胞中CYP1A2,CYP2B6,CYP2C9,CYP2C19,CYP2D6,CYP2E1 和 CYP3A4 基因表达水平;Western印迹法检测LX-2,L02 和HepG2细胞中以上7种CYP亚型蛋白表达水平;LX-2,L02和HepG2经Rif 5,10,20和40 μmol·L^-1诱导后,Luciferin-PFBE法检测细胞中CYP3A4酶活性变化。结果 CCK-8结果显示,与相应细胞对照组相比,Ome,Dex,Phe,Iso和Rif (≤ 40 μmol·L^-1)作用于LX-2,L02和HepG2细胞24 h,细胞存活率均>80%;RT-qPCR法检测结果显示,与LX-2细胞对照组相比,Phe诱导CYP2B6(P<0.05)和CYP2D6(P<0.01)表达上升;Western蛋白印迹结果显示,L02,LX-2和HepG2细胞经Ome,Dex,Phe,Iso和Rif 40 μmol·L^-1处理后,CYP1A2,CYP2B6,CYP2C9,CYP2C19,CYP2D6,CYP2E1和CYP3A4蛋白表达存在差异。L02细胞中 CYP2C9(IA=1.58±0.07),CYP2C19(IA=0.96±0.02)和 CYP3A4(IA=1.30±0.01),LX-2 细胞中CYP2B6(IA=1.48±0.01)和 CYP2D6(IA=1.46±0.02),HepG2 细胞中的CYP1A2(IA=1.62±0.19)和CYP2E1(IA=1.49±0.10)分别具有最高的表达丰度。CYP3A4 酶活性检测显示,Rif 处理 L02,LX-2 和HepG2细胞24 h后,CYP3A4活性变化无统计学差异。结论 L02,LX-2和HepG2细胞中CYP亚型蛋白表达丰度差异提示,L02 细胞适用于 CYP2C9,CYP2C19 和 CYP3A4 实验;LX-2 细胞适用于 CYP2B6 和CYP2D6实验;HepG2细胞适用于CYP1A2和CYP2E1实验。

OBJECTIVE To investigate the expression differences of seven cytochrome P450 (CYP) isoforms between L02, LX-2 and HepG2 cells and identify the most suitable cell type for different CYP researches. METHODS L02, LX-2 and HepG2 cells were treated with omeprazole (Ome), dexamethasone(Dex), phenobarbital sodium (Phe), isoniazid (Iso) and rifampicin (Rif) at 5, 10, 20 and 40 μmol?L -1 . Cell viability was analyzed by CCK-8 assay. The gene expressions of CYP1A2, CYP2B6, CYP2C9, CYP2C19, CYP2D6, CYP2E1 and CYP3A4 in LX-2 cells were assessed by real-time quantitative PCR (RT-qPCR). The protein expressions of these seven CYP isoforms in L02, LX-2 and HepG2 cells were assessed by Western blotting. Furthermore, CYP3A4 activity in the three types of cells treated with Rif 5, 10, 20 and 40 μmol·L^-1 for 24 h was validated by Luciferin-PFBE. RESULTS Cell viabilities of all the three hepatocytes were over 80% when exposed to Ome, Dex, Phe, Iso and Rif (≤40 μmol·L^-1) for 24 h. According to the RT-qPCR, Phe could significantly enhance the gene expressions of CYP2B6 (P<0.05) and CYP2D6 (P<0.01) in LX-2 cells. The results of Western blotting exhibited protein expression differences of seven CYP isoforms between L02, LX-2 and HepG2 cells treated with Ome, Dex, Phe, Iso and Rif (≤40 μmol·L^-1) for 24 h. CYP2C9〔Integrated absorbance (IA)=1.58±0.07〕, CYP2C19 (IA=0.95±0.03) and CYP3A4 (IA=1.29±0.05) had higher expression abundances in L02 cells, CYP2B6 (IA=1.48±0.01) and CYP2D6 (IA=1.46±0.02) in LX-2 cells, and CYP1A2 (IA=1.62±0.19) and CYP2E1 (IA=1.49±0.10) in HepG2 cells. Additionally, CYP3A4 activity in L02, LX-2 and HepG2 cells could not be up-regulated by Rif. CONCLUSION The most suitable cell type for different CYP researches is L02 for CYP2C9, CYP2C19 and CYP3A4, LX-2 for CYP2B6 and CYP2D6, HepG2 for CYP1A2 and CYP2E1, respectively.