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Papers In Press, published online ahead of print August 8, 2001
J. Biol. Chem, 10.1074/jbc.M106130200
Submitted on July 2, 2001
Revised on August 8, 2001
Accepted on August 7, 2001

Novel transcriptional regulation of the human CYP3A7 gene by specificity protein (Sp) 1 and Sp3 through nuclear factor-kappa B-like element

Tetsuya Saito, Yoshiki Takahashi, Hisashi Hashimoto, and Tetsuya Kamataki

Laboratory of Drug Metabolism,, Hokkaido University, Sapporo, Hokkaido 060-0812

Corresponding Author: kamataki{at}pharm.hokudai.ac.jp

Human CYP3A7 and CYP3A4 are expressed in fetal and adult livers, respectively, although the 5’-flanking regions of the two genes show 90% homology. The purpose of this study was to clarify the mechanism(s) responsible for the transcriptional regulation of the CYP3A7 gene in human hepatoma HepG2 cells that showed fetal phenotypes. Transfection studies using a series of the CYP3A7 or CYP3A4 promoter-luciferase chimeric genes identified a nuclear factor-kappa B (NF-kappa B) -like element between nucleotides –2326 and –2297 that conferred the transcriptional activation of the CYP3A7 gene. A one base pair mismatch within the corresponding region of the CYP3A4 gene was sufficient for a differential enhancer activity. A gel shift assay using nuclear extracts from HepG2 cells showed that specificity protein (Sp) 1 and Sp3 bound to the NF-kappa B-like element of the CYP3A7 but not CYP3A4 gene. Specific activation of the CYP3A7 promoter by Sp1 and Sp3 was confirmed by a co-transfection of the p3A7NF-kappa B or p3A4NF-kappa B reporter gene with Sp1 or Sp3 expression plasmid into Drosophila cells, which lacked endogenous Sp family. Additionally, introduction of mutations into binding sites for hepatocyte nuclear factor (HNF)-3beta , upstream regulatory factor (USF) 1 and a basic transcription element (BTE) in the proximal promoter attenuated a luciferase activity to 20% of the level seen with the intact CYP3A7 promoter. Thus, we conclude that the expression of the CYP3A7 gene in HepG2 cells is cooperatively regulated by Sp1, Sp3, HNF-3beta and USF1.


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