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Originally published In Press as doi:10.1074/jbc.M106130200 on August 8, 2001

J. Biol. Chem., Vol. 276, Issue 41, 38010-38022, October 12, 2001
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Novel Transcriptional Regulation of the Human CYP3A7 Gene by Sp1 and Sp3 through Nuclear Factor kappa B-like Element*

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

From the Laboratory of Drug Metabolism, Graduate School of Pharmaceutical Sciences, Hokkaido University, N12W6, Kita-ku, Sapporo, Hokkaido 060-0812, Japan

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 1-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 Sp1 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 3beta , upstream stimulatory factor 1, and a basic transcription element in the proximal promoter attenuated 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, hepatocyte nuclear factor 3beta , and upstream stimulatory factor 1.

* This work was supported in part by grants-in-aid from the Ministry of Education, Science, Sports and Culture of Japan, from the Program for Promotion of Fundamental Studies in Health Sciences of the Organization for Drug ADR Relief, R&D Promotion, and from Product Review of Japan and the Core Research for Evolutional Science and Technology.The costs of publication of this article were defrayed in part by the payment of page charges. The article must therefore be hereby marked "advertisement" in accordance with 18 U.S.C. Section 1734 solely to indicate this fact.

Dagger To whom all correspondence should be addressed: Lab. of Drug Metabolism, Graduate School of Pharmaceutical Sciences, Hokkaido University, N12W6, Kita-ku, Sapporo, Hokkaido 060-0812, Japan. Tel. and Fax: 81-11-706-4978; E-mail: kamataki@pharm.hokudai.ac.jp.

Copyright © 2001 by The American Society for Biochemistry and Molecular Biology, Inc.


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