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• W2160350538 abstract "GnRH-II is a potent GnRH subtype involved in modulating OVCAR-3 cell proliferation and the invasive properties of JEG-3 cells, and an atypical cAMP-response element (CRE) in the human GnRH-II promoter influences its activation. We demonstrated that the GnRH-II promoter is activated by 8-bromoadenosine-cAMP in several cell lines including αT3, TE671, JEG-3, and OVCAR-3 cells and that cAMP enhances GnRH-II mRNA levels in JEG-3 and OVCAR-3 cells. Moreover, 8-bromoadenosine-cAMP increases cAMP response element-binding protein (CREB) phosphorylation in JEG-3 and OVCAR-3 cells and augments CBP and CCAAT/enhancer-binding protein (C/EBP)-β coimmunoprecipitation with phosphorylated CREB (p-CREB) in a temporally defined manner from nuclear extracts. When CREB, CBP, and C/EBPβ levels were knocked down by small interfering RNA, reductions in any of these transcription factors reduced cAMP-enhanced GnRH-II promoter activity and GnRH-II mRNA levels in JEG-3 and OVCAR-3 cells. Importantly, chromatin immunoprecipitation assay showed that p-CREB bound the CRE within the endogenous GnRH-II promoter within 1 h and that p-CREB association with C/EBPβ occurs within 2 h of cAMP stimulation, coincident with the first appearance of C/EBPβ at the CRE. By contrast, maximum interactions between p-CREB and CBP do not occur until at least 4 h after cAMP stimulation, and this is reflected in the progressive loading of CBP at the CRE at 2–4 h, as demonstrated by chromatin immunoprecipitation. Taken together, these data suggest that p-CREB, C/EBPβ, and CBP are recruited to the CRE of the GnRH-II promoter in a temporarily defined manner to enhance its transcription in JEG-3 and OVCAR-3 cells in response to cAMP." @default.
• W2160350538 created "2016-06-24" @default.
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• W2160350538 date "2008-07-03" @default.
• W2160350538 modified "2023-09-27" @default.
• W2160350538 title "Temporal Recruitment of Transcription Factors at the 3′,5′-Cyclic Adenosine 5′-Monophosphate-Response Element of the Human GnRH-II Promoter" @default.
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• W2160350538 doi "https://doi.org/10.1210/en.2008-0481" @default.
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