Relationship between CYP3A29 and pregnane X receptor in landrace pigs: Pig CYP3A29 has a similar mechanism of regulation to human CYP3A4

Comparative Biochemistry and Physiology. Toxicology & Pharmacology : CBP
Yucheng HeDingren Bi

Abstract

The objective of this study was to provide evidence of the validity of utilizing pigs as a model to study the regulation of human CYP3A4, with special emphasis on drug-drug interactions. We determined the mRNA expression and distribution of CYP3A and metabolic nuclear receptors in different tissues isolated from landrace pigs. Our results showed that CYP3A and metabolic nuclear receptor mRNAs were most highly expressed in liver tissues. The expression of the metabolic nuclear receptor pregnane X receptor (PXR) had a significant correlation with expression of CYP3A29, an analog of human CYP3A4. The correlation between their transcriptional levels was further demonstrated using LPS and TNF-α. The mRNA and protein expression of CYP3A29 and PXR in HepLi cells was significantly reduced by LPS and TNF-α treatment. CYP3A29 promoter activity was dramatically elevated by PXR over expression, whereas LPS and TNF-α treatment inhibited the enhanced CYP3A29 promoter activity that was induced by PXR; presumably through inhibition of PXR promoter activity. Furthermore, the inhibition of CYP3A29 promoter activity by LPS and TNF-α treatment was blocked by knockdown of PXR or retinoid X receptor (RXR). These data suggest high similarity in the r...Continue Reading

Citations

Oct 12, 2019·American Journal of Physiology. Gastrointestinal and Liver Physiology·Gregory GuthrieDouglas Burrin
Dec 25, 2019·Scientific Reports·Mery GiantinMauro Dacasto
Mar 17, 2020·Archives of Toxicology·Martin Krøyer Rasmussen

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