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- W2026468124 abstract "Promoter activation in the expression of phospholipid hydroperoxide glutathione peroxidase (PHGPx) gene in human epidermoid carcinoma A431 cells was studied in the present investigation. Luciferase reporter assays with plasmids carrying a 400 bp of the promoter DNA were performed to analyze the regulatory element in the proximal promoter of human PHGPx gene. Transient transfection with a series of 5'-deletion and internal truncation mutants showed that the 5'-flanking region spanning from -212 to -121 bp was important for the basal expression of PHGPx gene in A431 cells. A region from -170 to -140 bp was protected in DNase I footprinting assays and bound the nuclear proteins in electrophoretic mobility shift assays. This region, denoted FP3, contains the consensus recognition sites for AP-2, CCAAT-box and CRE. The oligonucleotide competitor with the mutation at CCAAT-box could not eliminate the nuclear protein binding in gel-shift assay and the site-directed mutagenesis at the CCAAT-box decreased the luciferase activity of PHGPx promoter for approximate 50% in reporter gene assays. Competition experiments indicate that the binding of nuclear factor to the FP3 region was abolished by oligodeoxyribonucleotide corresponding to NF-Y/CP1 binding site to a greater extent than by those corresponding to sites for CTF/NFI and C/EBP. Taken together, the CCAAT-box in the promoter ranging from -156 to -151 bp, bound to NF-Y/CP1, was essential for the basal expression of human PHGPx gene in A431 cells." @default.
- W2026468124 created "2016-06-24" @default.
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- W2026468124 date "1999-07-15" @default.
- W2026468124 modified "2023-10-14" @default.
- W2026468124 title "The CCAAT-box binding factor NF-Y is required for the expression of phospholipid hydroperoxide glutathione peroxidase in human epidermoid carcinoma A431 cells" @default.
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- W2026468124 doi "https://doi.org/10.1016/s0014-5793(99)00866-2" @default.
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