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- W2916801577 abstract "The cytochrome P450 3A subfamily plays vital roles in the metabolism of endogenous chemicals and xenobiotics. Understanding the basal expression of CYP3A in humans and pigs is crucial for drug evaluation. In this study, we demonstrated that the basal transcriptional regulation of CYP3A genes in hepatocytes is evolutionarily conserved between humans and pigs. The basal expression of CYP3A genes is transactivated by two cis-acting elements, the CCAAT and GC boxes, located a constant distance apart in the proximal promoter region of six CYP3A genes. Mutation analysis of these two cis-acting elements suggested that they play important roles in mediating basal expression, but to different extents because of the nucleotide variations in the elements. Two transcription factors, nuclear transcription factor Y (NF-Y) and specificity protein 1 (Sp1), directly bind to these cis-acting elements in CYP3A proximal promoters in HepG2 cells and porcine hepatocytes. Furthermore, changing the distance between the NF-Y and Sp1 binding sites resulted in decreases in the promoter activity of CYP3A genes. Conclusively, our results show that human and porcine CYP3A genes are regulated by NF-Y and Sp1 in a coordinated manner, and that the distance between these two cis-acting elements is crucial for constitutive CYP3A expression." @default.
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- W2916801577 date "2019-02-19" @default.
- W2916801577 modified "2023-10-15" @default.
- W2916801577 title "Coordinated Transcriptional Regulation of Cytochrome P450 3As by Nuclear Transcription Factor Y and Specificity Protein 1" @default.
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- W2916801577 doi "https://doi.org/10.1124/mol.118.114439" @default.
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