目的探讨2,2′,4,4′-四溴联苯醚(BDE-47)是否为孕烷X受体(pregnane X receptor,PXR)的诱导剂及其诱导PXR受体下游基因细胞色素P4503A4(CYP3A4)的转录表达能力。方法采用CCK-8法测定分析BDE-47对人肝肿瘤细胞株HepG2的细胞毒性作用,并以...目的探讨2,2′,4,4′-四溴联苯醚(BDE-47)是否为孕烷X受体(pregnane X receptor,PXR)的诱导剂及其诱导PXR受体下游基因细胞色素P4503A4(CYP3A4)的转录表达能力。方法采用CCK-8法测定分析BDE-47对人肝肿瘤细胞株HepG2的细胞毒性作用,并以BDE-47分别处理双萤光素酶hPXR报告基因系统和稳定高表达hPXR的HepG2细胞株,观察其对CYP3A4的诱导作用和对其mRNA及蛋白表达的诱导作用。结果BDE-47对HepG2细胞有明显的细胞毒性作用,且在6～48h呈明显剂量-时间-效应关系(P<0.01)。48h为毒作用兴奋点,其半数抑制浓度(IC50)为110μmol/L。BDE-47能诱导CYP3A4表达量的增高,呈明显剂量-时间-效应关系(P<0.01)。Q-PCR和Western Blot分析发现,其对CYP3A4的mRNA转录和蛋白表达有显著诱导作用,并呈剂量-效应关系(P<0.01),对PXR受体诱导能力明显高于已知的阳性诱导物利福平。结论在本试验条件下,BDE-47是PXR受体的强力诱导剂,可能通过激活PXR受体而发挥其一系列毒性作用。展开更多
Polychlorinated biphenyls(PCBs) can antagonize human pregnane X receptor(hPXR) activation.Such chemicals could pose a serious threat to the reproductive and developmental ability of humans.The quantitative structure a...Polychlorinated biphenyls(PCBs) can antagonize human pregnane X receptor(hPXR) activation.Such chemicals could pose a serious threat to the reproductive and developmental ability of humans.The quantitative structure activity relationship(QSAR) provides a promising method for the estimation of PCBs' antagonistic activity.In this investigation,a QSAR model was developed by using heuristic method and best subset modeling(r2 = 0.873,q2LOO=0.742).The built model was validated externally by splitting the original data set into training and prediction sets.The results of the model derived are as follows:r2 = 0.907,q2LOO=0.709,r2pred=0.676,suggesting developed QSAR model had good robustness and predictive ability.The applicability domain(AD) of the model was assessed by Williams plot.The antagonistic activity(?logKi) of 108 PCBs,which are unavailable by experiment at present,was predicted within the applicability domain of the model.The critical structural features related to the activity of PCBs were identified.展开更多
文摘目的探讨2,2′,4,4′-四溴联苯醚(BDE-47)是否为孕烷X受体(pregnane X receptor,PXR)的诱导剂及其诱导PXR受体下游基因细胞色素P4503A4(CYP3A4)的转录表达能力。方法采用CCK-8法测定分析BDE-47对人肝肿瘤细胞株HepG2的细胞毒性作用,并以BDE-47分别处理双萤光素酶hPXR报告基因系统和稳定高表达hPXR的HepG2细胞株,观察其对CYP3A4的诱导作用和对其mRNA及蛋白表达的诱导作用。结果BDE-47对HepG2细胞有明显的细胞毒性作用,且在6～48h呈明显剂量-时间-效应关系(P<0.01)。48h为毒作用兴奋点,其半数抑制浓度(IC50)为110μmol/L。BDE-47能诱导CYP3A4表达量的增高,呈明显剂量-时间-效应关系(P<0.01)。Q-PCR和Western Blot分析发现,其对CYP3A4的mRNA转录和蛋白表达有显著诱导作用,并呈剂量-效应关系(P<0.01),对PXR受体诱导能力明显高于已知的阳性诱导物利福平。结论在本试验条件下,BDE-47是PXR受体的强力诱导剂,可能通过激活PXR受体而发挥其一系列毒性作用。
基金supported by the Science and Technology Development Foundation Key Project of Nanjing Medical University (09NJMUZ16)Natural Science Research Project of Institution of Higher Education of Jiangsu Province (11KJB180006)
文摘Polychlorinated biphenyls(PCBs) can antagonize human pregnane X receptor(hPXR) activation.Such chemicals could pose a serious threat to the reproductive and developmental ability of humans.The quantitative structure activity relationship(QSAR) provides a promising method for the estimation of PCBs' antagonistic activity.In this investigation,a QSAR model was developed by using heuristic method and best subset modeling(r2 = 0.873,q2LOO=0.742).The built model was validated externally by splitting the original data set into training and prediction sets.The results of the model derived are as follows:r2 = 0.907,q2LOO=0.709,r2pred=0.676,suggesting developed QSAR model had good robustness and predictive ability.The applicability domain(AD) of the model was assessed by Williams plot.The antagonistic activity(?logKi) of 108 PCBs,which are unavailable by experiment at present,was predicted within the applicability domain of the model.The critical structural features related to the activity of PCBs were identified.
