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Xie T , Jaiswal AK
AP-2-mediated regulation of human NAD(P)H:quinone oxidoreductase(1) (NQO(1)) gene expression
Biochemical Pharmacology. 1996 Mar 22;51(6) :771-778
PMID: ISI:A1996TZ10700007   
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NAD(P)H:quinone oxidoreductase(1) (NQO(1)) is a flavoprotein that catalyzes two-electron reduction and detoxification of quinones. We have shown previously that twenty-four base pairs of the human Antioxidant Response Element (hARE) mediate basal and xenobiotic-induced expression of the NQO(1) gene [Li and Jaiswal, J Biol Chem 267: 15097-15104, 1992]. In the present report, we have characterized a second cis-element, AP-2, at nucleotide position -157 of the human NQO(1) gene promoter that regulates basal and cAMP-induced transcription of the NQO(1) gene. The NQO(1) gene AP-2-mediated expression of the chloramphenicol acetyl transferase (CAT) gene and the binding of nuclear proteins to the AP-2 element were observed in HeLa (AP-2 positive) cells but not in human hepatoblastoma Hep-G2 (AP-2 deficient) cells, indicating the involvement of transcription factor AP-2 in the regulation of NQO(1) gene expression. Affinity purification of nuclear protein that binds to the NQO(1) gene AP-2 DNA element and western analysis revealed that AP-2 indeed binds to the NQO(1) gene AP-2 element and regulates its expression in HeLa cells. The involvement of AP-2 in the regulation of NQO(1) gene expression was confirmed by the observation that cDNA-derived AP-2 protein in Hep-G2 cells increased in the NQO(1) gene AP-2 but not mutant AP-2 mediated expression of CAT gene in Hep-G2 cells.
Times Cited: 6 English Article TZ107 BIOCHEM PHARMACOL