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• W2017945423 abstract "Heme oxygenase (HO) catalyzes the conversion of heme to biliverdin with the release of iron and carbon monoxide. HO-1 is highly inducible by a large number of physical and chemical factors. In recent work, we had identified a metalloporphyrin-responsive element (MPRE) that localized at -3.7 kb upstream of the transcription start site of the chick HO-1 gene. Here, we identify four additional heme-responsive elements (HeREs), which are expanded AP-1 sites, in the 5'-flanking region of the chick HO-1 gene. These sites, located at -4675, -4599, -3660, and -3625 bp from the transcription start site of the gene, were necessary and sufficient for up-regulation of luciferase reporter gene expression in the presence of heme and cobalt protoporphyrin (CoPP), but not several other metalloporphyrins. Site-directed mutagenesis was carried out using pcHO7.1Luc or pcHO7.1-4.6Luc as templates. Single and multiple mutations of HeREs and MPRE significantly abrogated the heme- and CoPP-dependent up-regulation of reporter gene expression in transient or stable transfection experiments.The chick HO-1 promoter region contains expanded AP-1 sites that are important for up-regulation of the gene by heme and CoPP, but not other metalloporphyrins. These key regulatory elements consist of consensus AP-1 binding sites that have been extended by three base pairs." @default.
• W2017945423 created "2016-06-24" @default.
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• W2017945423 date "2004-08-01" @default.
• W2017945423 modified "2023-10-18" @default.
• W2017945423 title "Identification of key elements that are responsible for heme-mediated induction of the avian heme oxygenase-1 gene" @default.
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• W2017945423 doi "https://doi.org/10.1016/j.bbaexp.2004.05.003" @default.
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