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• W2028357105 abstract "Abstract Although Ca2+ and cAMP mediate their effects through distinct pathways, both signals converge upon the phosphorylation of the cAMP response element (CRE) binding protein, CREB, thereby activating transcription of CRE-regulated genes. In WEHI7.2 thymocytes, cAMP increases the expression of the inducible cAMP early repressor (ICER) gene through CRE-like elements, known as cAMP autoregulatory elements (CAREs). Because Ca2+- and cAMP-mediated transcription converge in WEHI7.2 thymocytes, we examined the effect of Ca2+ fluxes on the expression of the ICER gene in these cells. Despite the presence of multiple CAREs within its promoter, ICER gene transcription was not activated by Ca2+. Moreover, Ca2+ attenuated the stimulatory effect of cAMP on ICER expression. Transient expression of reporter constructs demonstrated that when these CAREs were placed in a different DNA promoter context, the elements became responsive to Ca2+. Detailed studies using chimeric promoter constructs to map the region responsible for blocking the transcriptional response to Ca2+ indicated that a small portion of the ICER promoter was necessary for the effect. Southwestern blot analysis identified a 83-kDa nuclear protein that bound specifically to that region. The relative binding activity of the factor to the ICER promoter and mutant promoter sequences correlated with an inhibition of Ca2+-activated gene expression in WEHI7.2 cells. These data suggest that the factor functions as a putative Ca2+-activated repressor of CREB/CRE-mediated transcription. Thus, depending on the surrounding context in which the CRE is located, CREs of individual genes can be regulated separately by Ca2+ and cAMP despite the convergence of these two signaling pathways." @default.
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• W2028357105 date "1999-07-01" @default.
• W2028357105 modified "2023-09-24" @default.
• W2028357105 title "Functional Analysis of the Mouse ICER (Inducible cAMP Early Repressor) Promoter: Evidence for a Protein That Blocks Calcium Responsiveness of the CAREs (cAMP Autoregulatory Elements)" @default.
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• W2028357105 doi "https://doi.org/10.1210/mend.13.7.0319" @default.
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