Regulation of human pregnane X receptor and its target gene cytochrome P450 3A4 by Chinese herbal compounds and a molecular docking study

Ya He Liu, Sui Lin Mo, Hui Chang Bi, Bing Fang Hu, Chun Guang Li, Yi Tao Wang, Ling Huang, Min Huang, Wei Duan, Jun Ping Liu, Ming Qian Wei, Shu-Feng Zhou

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Abstract

The pregnane X receptor (PXR) plays a critical role in the regulation of human cytochrome P450 3A4 (CYP3A4) gene. In this study, we investigated the effect of an array of compounds isolated from Chinese herbal medicines on the activity of PXR using a luciferase reporter gene assay in transiently transfected HepG2 and Huh7 cells and on the expression of PXR and CYP3A4 in LS174T cells. Furthermore, molecular docking was performed to investigate the binding modes of herbal compounds with PXR. Praeruptorin A and C, salvianolic acid B, sodium danshensu, protocatechuic aldehyde, cryptotanshinone, emodin, morin, and tanshinone IIA significantly transactivated the CYP3A4 reporter gene construct in either HepG2 or Huh7 cells. The PXR mRNA expression in LS174T cells was significantly induced by physcion, protocatechuic aldehyde, salvianolic acid B, and sodium danshensu. However, epifriedelanol, morin, praeruptorin D, mulberroside A, tanshinone I, and tanshinone IIA significantly down-regulated the expression of PXR mRNA in LS174T cells. All the herbal compounds tested can be readily docked into the ligand-binding cavity of PXR mainly through hydrogen bond and aromatic interactions with Ser247, Gln285, His407, and Arg401. These findings suggest that herbal medicines can significantly regulate PXR and CYP3A4 and this has important implication in herb-drug interactions.

Original languageEnglish
Pages (from-to)259-280
Number of pages22
JournalXenobiotica
Volume41
Issue number4
DOIs
Publication statusPublished - Apr 2011

Keywords

  • CYP3A4
  • herb-drug interaction
  • herbal medicine
  • induction
  • PXR

Cite this

Liu, Y. H., Mo, S. L., Bi, H. C., Hu, B. F., Li, C. G., Wang, Y. T., Huang, L., Huang, M., Duan, W., Liu, J. P., Wei, M. Q., & Zhou, S-F. (2011). Regulation of human pregnane X receptor and its target gene cytochrome P450 3A4 by Chinese herbal compounds and a molecular docking study. Xenobiotica, 41(4), 259-280. https://doi.org/10.3109/00498254.2010.537395