Abstract
Human dihydrodiol dehydrogenase (DD) 4/aldo-keto reductase (AKR) 1C4 is a major isoform of hepatic DD that oxidizes trans-dihydrodiols of polycyclic aromatic hydrocarbons to reactive and redox-active o-quinones and that reduces several ketone-containing drugs. To investigate the mechanism of transcriptional regulation of the human DD4 gene, the 5'-flanking region of the gene was fused to the luciferase gene. The results of luciferase assays using HepG2 cells and of 1,10-phenanthroline-copper footprinting indicated that two positive regulatory regions were located in regions from -701 to -684 and from -682 to -666. The former region contained a putative hepatocyte nuclear factor (HNF)-4 binding motif, and the latter region contained an HNF-1 consensus binding sequence. DNA fragments of the HNF-4 or HNF-1 motif gave a shifted band in a gel-shift assay with nuclear extracts from HepG2 cells. The formation of the DNA-protein complex was inhibited by the HNF-4 or HNF-1 motif of the alpha(1)-antitrypsin gene. A supershift assay using antibodies to human HNF-4alpha, HNF-4gamma and HNF-1alpha showed that HNF-4alpha and HNF-4gamma bound to the HNF-4 motif, and that HNF-1alpha interacted with the HNF-1 motif. Introduction of mutations into the HNF-4 or HNF-1 motif lowered the luciferase activity to 10 or 8% respectively of that seen with the intact human DD4 gene. These results indicate that HNF-4alpha, HNF-4gamma and HNF-1alpha regulate co-operatively the transcription of the human DD4 gene in HepG2 cells.
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