目的:探讨茵栀黄对CYP3A4转录表达的影响及机制。方法:Chang Liver细胞中加入0.01、0.1和1μM茵栀黄分别作用24h、36h和48h,采用RT-PCR法和报告基因方法检测CYP3A4 m RNA的表达水平。结果:不同浓度茵栀黄分别处理Chang Liver细胞24h和36...目的:探讨茵栀黄对CYP3A4转录表达的影响及机制。方法:Chang Liver细胞中加入0.01、0.1和1μM茵栀黄分别作用24h、36h和48h,采用RT-PCR法和报告基因方法检测CYP3A4 m RNA的表达水平。结果:不同浓度茵栀黄分别处理Chang Liver细胞24h和36h可明显升高CYP3A4 m RNA的表达水平(P<0.05);转入CAR载体的Chang Liver细胞经不同浓度茵栀黄处理36h均可激活CYP3A4的转录表达。结论:茵栀黄可能通过CAR介导增加Chang Liver细胞CYP3A4的转录表达。展开更多
目的概述我们对孕烷X受体(pregnane X receptor,PXR)和组成性雄甾烷受体(constitutive androstane receptor,CAR)作为中草药调节剂作用的最新认识及其研究进展。方法首先对孕烷X受体和组成性雄甾烷受体作用机制及靶基因谱进行系统阐述,...目的概述我们对孕烷X受体(pregnane X receptor,PXR)和组成性雄甾烷受体(constitutive androstane receptor,CAR)作为中草药调节剂作用的最新认识及其研究进展。方法首先对孕烷X受体和组成性雄甾烷受体作用机制及靶基因谱进行系统阐述,其次考察常用中草药对孕烷X受体和组成性雄甾烷受体的调节作用,以及探讨孕烷X受体和组成性雄甾烷受体作用于内源性物质的最新研究进展。结果与结论孕烷X受体和组成性雄甾烷受体是控制一系列广泛基因表达的转录因子,它们不仅涉及到许多药物以及其他外源性化学物和内源性物质,如:胆汁,胆红素以及某些维生素在细胞间转运和生物转化,还包括脂代谢,糖代谢和炎症等各种生理和病理过程。展开更多
AIM： To ascertain whether constitutive androstane receptor （CAR） activation by 1,4-bis-[2-（3,5,- dichloropyridyloxy）] benzene （TCPOBOP） modulates steatohepatitis in the methionine choline-deficient （MCD） diet...AIM： To ascertain whether constitutive androstane receptor （CAR） activation by 1,4-bis-[2-（3,5,- dichloropyridyloxy）] benzene （TCPOBOP） modulates steatohepatitis in the methionine choline-deficient （MCD） diet-fed animal.METHODS： C57/BL6 wild-type mice were fed the MCD or standard diet for 2 wk and were treated with either the CAR agonist, TCPOBOP, or the CAR inverse agonist, androstanol.RESULTS： Expression of CYP2B10 and CYP3A11, known CAR target genes, increased 30-fold and 45-fold, respectively, in TCPOBOP-treated mice fed the MCD diet. TCPOBOP treatment reduced hepatic steatosis （44.6 ＋ 5.4% vs 30.4 ＋ 4.5%, P 〈 0.05） and serum triglyceride levels （48 ＋ 8 vs 20 ＋ 1 mg/dL, P 〈 0.05） in MCD diet- fed mice as compared with the standard diet-fed mice. This reduction in hepatic steatosis was accompanied by an increase in enzymes involved in fatty acid microsomal co-oxidation and peroxisomal p-oxidation, namely CYP4A10, LPBE, and 3-ketoacyI-CoA thiolase. The reduction in steatosis was also accompanied by a reduction in liver cell apoptosis and inflammation. In contrast, androstanol was without effect on any of the above parameters.CONCLUSION： CAR activation stimulates induction of genes involved in fatty acid oxidation, and ameliorates hepatic steatosis, apoptosis and inflammation.展开更多
文摘目的:探讨茵栀黄对CYP3A4转录表达的影响及机制。方法:Chang Liver细胞中加入0.01、0.1和1μM茵栀黄分别作用24h、36h和48h,采用RT-PCR法和报告基因方法检测CYP3A4 m RNA的表达水平。结果:不同浓度茵栀黄分别处理Chang Liver细胞24h和36h可明显升高CYP3A4 m RNA的表达水平(P<0.05);转入CAR载体的Chang Liver细胞经不同浓度茵栀黄处理36h均可激活CYP3A4的转录表达。结论:茵栀黄可能通过CAR介导增加Chang Liver细胞CYP3A4的转录表达。
文摘目的概述我们对孕烷X受体(pregnane X receptor,PXR)和组成性雄甾烷受体(constitutive androstane receptor,CAR)作为中草药调节剂作用的最新认识及其研究进展。方法首先对孕烷X受体和组成性雄甾烷受体作用机制及靶基因谱进行系统阐述,其次考察常用中草药对孕烷X受体和组成性雄甾烷受体的调节作用,以及探讨孕烷X受体和组成性雄甾烷受体作用于内源性物质的最新研究进展。结果与结论孕烷X受体和组成性雄甾烷受体是控制一系列广泛基因表达的转录因子,它们不仅涉及到许多药物以及其他外源性化学物和内源性物质,如:胆汁,胆红素以及某些维生素在细胞间转运和生物转化,还包括脂代谢,糖代谢和炎症等各种生理和病理过程。
基金NIH grants T32 DK07198-26 (to ESB) andDK41876 (to GJG),and the Palumbo and Mayo Foundation
文摘AIM： To ascertain whether constitutive androstane receptor （CAR） activation by 1,4-bis-[2-（3,5,- dichloropyridyloxy）] benzene （TCPOBOP） modulates steatohepatitis in the methionine choline-deficient （MCD） diet-fed animal.METHODS： C57/BL6 wild-type mice were fed the MCD or standard diet for 2 wk and were treated with either the CAR agonist, TCPOBOP, or the CAR inverse agonist, androstanol.RESULTS： Expression of CYP2B10 and CYP3A11, known CAR target genes, increased 30-fold and 45-fold, respectively, in TCPOBOP-treated mice fed the MCD diet. TCPOBOP treatment reduced hepatic steatosis （44.6 ＋ 5.4% vs 30.4 ＋ 4.5%, P 〈 0.05） and serum triglyceride levels （48 ＋ 8 vs 20 ＋ 1 mg/dL, P 〈 0.05） in MCD diet- fed mice as compared with the standard diet-fed mice. This reduction in hepatic steatosis was accompanied by an increase in enzymes involved in fatty acid microsomal co-oxidation and peroxisomal p-oxidation, namely CYP4A10, LPBE, and 3-ketoacyI-CoA thiolase. The reduction in steatosis was also accompanied by a reduction in liver cell apoptosis and inflammation. In contrast, androstanol was without effect on any of the above parameters.CONCLUSION： CAR activation stimulates induction of genes involved in fatty acid oxidation, and ameliorates hepatic steatosis, apoptosis and inflammation.
