摘要
目的:观察山奈酚能否通过活化孕烷X受体(PXR)诱导细胞色素P 450 3A 4(CYP 3A 4)的转录表达。方法:在人肝肿瘤细胞株H epG2细胞中,用瞬时共转染报告基因试验检测山奈酚对PXR介导的CYP 3A 4的转录调节作用。结果:山奈酚能通过活化PXR诱导CYP 3A 4的转录表达,其诱导能力随山奈酚的浓度增大和处理时间延长而呈增强趋势。山奈酚在浓度为0.001、0.01、0.1、1.0和10.0μm o l/L下,其诱导倍数分别为0.1%二甲基亚砜(DM SO)处理组的(1.31±0.27)倍、(1.45±0.36)倍、(1.96±0.50)倍、(2.90±1.07)倍和(7.93±0.75)倍(P均<0.05)。1.0和10.0μm o l/L的山奈酚在48 h内其诱导作用随诱导时间的增加而增强,处理48 h后其诱导能力分别为0.1%DM SO处理组的(3.73±1.21)倍和(8.42±1.47)倍。结论:山奈酚能通过活化PXR诱导CYP 3A 4的转录表达。
Objective: To investigate whether kaempferol stimulates pregnane X receptor (PXR)-mediated transcription of CYP3A4. Methods: Transient cotransfection reporter gene assay was performed with PXR expression plasmid and a reporter plasmid containing the XREs in the CYP3A4 gene promoter in HepG2 cells. Results: Kaempferol activated PXR-mediated transcription of CYP3A4 in a dose, time-dependent manner. In the dose-response study, kaempferol exposure at concentrations of 1.0×10^-3,1.0×10^-2,0.1,1.0and 10.0mol/L for 24h increased CYP3A4 transcription by (1.31±0. 27), (1.45±0.36), (1.96±0.50), (2.90±1.07) and (7.93±0.75) fold,respectively compared with 0.1% DMSO(P〈0.05). The results from time-course study showed that after 48 h exposure 1. 0 and 10.0 mol/L of kaempferol enhanced the transcription of CYP3A4 by (3.73±1.21) fold and (8.42±1.47) fold, respectively.Conclusion:. Kaempferol may be a human CYP3A4 gene inducer through PXR,and may affect the metabolism of a large number of substrates of CYP3A4 simultaneously taken.
出处
《浙江大学学报(医学版)》
CAS
CSCD
2006年第1期14-17,共4页
Journal of Zhejiang University(Medical Sciences)
基金
国家自然科学基金资助项目(30471472)
浙江省自然科学基金资助项目(M303870)
关键词
细胞色素P450
山奈酚
肝肿瘤
肿瘤细胞
培养的
转染
基因
受体
孕烷
Cytochrome P450, Kaempferol
Liver neoplasms
Tumor cells, cultured
Transfection
Genes, Receptor ,pregnanes