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• W1990898737 abstract "In several cell types, mostly of epithelial origin, activation of the cAMP pathway triggers DNA synthesis and cell division. Regulation of gene expression by cAMP involves phosphorylation by pyruvate kinase A and activation of cAMP-response element binding protein (CREB)/CRE modulator (CREM) transcription factors which bind DNA to CRE sites. On the other hand, several CREM isoforms are transcriptional repressors, such as the inducible cAMP early repressor (ICER) transcription factors, which are synthesized from an intronic promoter of the CREM gene. This study investigated the potential role of CREB/CREM transcription factors in the cAMP mitogenic pathway, using an experimental model of epithelial cells in primary culture, i.e. dog thyroid cells stimulated by thyroid-stimulating hormone (TSH). In response to TSH, CREB/CREM transcription factors were phosphorylated on the serine residue of the pyruvate kinase A consensus site. In addition, the synthesis of ICER mRNAs was strongly induced by TSH. This transient upregulation of ICER expression correlated with increased protein levels. It was restricted to the cAMP pathway, as neither epidermal growth factor nor phorbol myristate acetate, which are potent mitogens for dog thyroid cells, induced ICER expression. On the other hand, increased expression of ICER mRNAs was not detected in dog thyroids chronically stimulated by TSH in vivo. The requirement for CREB/CREM transcription factors in the mitogenic effect of TSH was assessed by transfecting expression vectors encoding CREM repressors into dog thyrocytes in order to interfere with CRE-mediated gene transcription. The ectopic expression of ICER Igamma or CREM alpha isoforms inhibited DNA replication in dog thyrocytes stimulated by TSH. This inhibitory effect was dependent on the ability of CREM repressors to form dimers but did not involve their DNA-binding capacity. Together these results show that CREB/CREM transcription factors are tightly regulated, at the transcriptional and post-translational levels, by TSH in dog thyroid cells, and provide clear evidence that their activity is required for the cAMP-dependent proliferation of cells in primary culture. Moreover, the transient induction of ICER transcription factors during mitogenic stimulation by TSH raises questions about the role of these potent repressors of CRE-dependent transcription as timers of cellular proliferation." @default.
• W1990898737 created "2016-06-24" @default.
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• W1990898737 date "1999-01-01" @default.
• W1990898737 modified "2023-09-27" @default.
• W1990898737 title "Requirement for cAMP-response element (CRE) binding protein/CRE modulator transcription factors in thyrotropin-induced proliferation of dog thyroid cells in primary culture" @default.
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• W1990898737 doi "https://doi.org/10.1046/j.1432-1327.1999.00049.x" @default.
• W1990898737 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/9914516" @default.
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