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• W1968224602 endingPage "1476" @default.
• W1968224602 startingPage "1467" @default.
• W1968224602 abstract "A complex interaction between the Glucocorticoid Receptor (GR), C/EBPβ, and other transcription factors activate the Alpha-1 Acid Glycoprotein (AGP) promoter in HTC(JZ-l) rat hepatoma culture cells. This effect is mediated by the so-called Steroid Responsive Unit (SRU) of the AGP promoter that contains several binding sites for C/EBP transcription factors, some of which overlap with the Glucocorticoid Responsive Element (GRE). Our in vivo footprinting experiments revealed that the GRE- and the C/EBP-binding sites were already occupied glucocorticoid dependently in HTC(JZ-l) cells 10 min after dexamethasone administration (10-6 M). Furthermore, local changes in the chromatine structure shown by the appearance of DNAse I hypersensitive sites (HS sites) also took place. These changes were probably dependent on a tissue-specific organization of the chromatine at the SRU because they were not detectable in a different glucocorticoid-responsive cell line (PC12) that did not express AGP. Here, we have also shown that withdrawal of dexamethasone or addition of the anti-glucocorticoid RU486 were able to revert the pattern induced by dexamethasone in vivo. The disappearance of the protected region and the hypersensitive sites, typical of the hormone activated promoter, confirmed the necessity of the GR to be bound by the agonist and the inability of the GR-antagonist complex to bind the DNA. By functional assays, we showed that the occupancy of the SRU by these transcriptional proteins in vivo correlated with the activation of the AGP gene transcription. With these results, we have shown that one of the functions of the GR to activate transcription of the AGP gene is to recruit C/EBPβ and to maintain it bound at its target DNA sequences (SRU). This process was not accomplished by RU486." @default.
• W1968224602 created "2016-06-24" @default.
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• W1968224602 date "1997-12-01" @default.
• W1968224602 modified "2023-10-15" @default.
• W1968224602 title "The Glucocorticoid Receptor Regulates the Binding of C/EPBβ on the Alpha-1-Acid Glycoprotein Promoter<i>In Vivo</i>" @default.
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• W1968224602 doi "https://doi.org/10.1089/dna.1997.16.1467" @default.
• W1968224602 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/9428795" @default.
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