Defining a role for GPCR/cAMP/Creb signaling in HFSC activation
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ABSTRACT:
ORGANISM(S): Mus musculus
PROVIDER: GSE173591 | GEO | 2021/04/30
REPOSITORIES: GEO
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Project description:Defining a role for GPCR/cAMP/Creb signaling in HFSC activation
| PRJNA726217 | ENA
Project description:Hormones and nutrients often induce genetic programs via signaling pathways that interface with gene-specific activators. Activation of the cAMP pathway, for example, stimulates cellular gene expression by means of the PKA-mediated phosphorylation of cAMP-response element binding protein (CREB) at Ser-133. Here, we use genome-wide approaches to characterize target genes that are regulated by CREB in different cellular contexts. CREB was found to occupy approximately 4,000 promoter sites in vivo, depending on the presence and methylation state of consensus cAMP response elements near the promoter. The profiles for CREB occupancy were very similar in different human tissues, and exposure to a cAMP agonist stimulated CREB phosphorylation over a majority of these sites. Only a small proportion of CREB target genes was induced by cAMP in any cell type, however, due in part to the preferential recruitment of the coactivator CREB-binding protein to those promoters. These results indicate that CREB phosphorylation alone is not a reliable predictor of target gene activation and that additional CREB regulatory partners are required for recruitment of the transcriptional apparatus to the promoter.
2006-05-09 | E-WMIT-11 | biostudies-arrayexpress
Project description:We investigated genome-wide occupancy of CREB, CREB coactivators, lineage determining transcription factors and histone acetylation to uncover mechanisms behind tissue-specific gene induction by cAMP in pancreatic islets. CREB mediates effects of cAMP on cellular gene expression. Most core CREB target genes are ubiquitously induced following recruitment of CREB and its coactivators to promoter proximal binding sites. We found that CREB stimulates the expression of pancreatic beta cell genes by binding to sites within distal enhancers. By contrast with its transient effects on core target genes, CREB stimulates pancreatic beta cell specific gene expression in a sustained manner, reflecting increases in the CBP-mediated acetylation of resident nucleosomes that recruit the chromatin reader BRD4. CREB cooperates with the lineage specific activator Neurod1 in establishing cAMP-responsive enhancers in beta cells. As deletion of a CREB-Neurod1 bound enhancer within the Lrrc10b-Syt7 super-enhancer locus disrupted the expression of both genes and decreased glucose-induced insulin secretion, our results demonstrate how cooperativity between signal dependent and lineage determining factors promotes the expression of cell type-specific gene programs in response to extracellular cues.
2019-06-16 | GSE126557 | GEO
Project description:We investigated genome-wide occupancy of CREB, CREB coactivators, lineage determining transcription factors and histone acetylation to uncover mechanisms behind tissue-specific gene induction by cAMP in pancreatic islets. CREB mediates effects of cAMP on cellular gene expression. Most core CREB target genes are ubiquitously induced following recruitment of CREB and its coactivators to promoter proximal binding sites. We found that CREB stimulates the expression of pancreatic beta cell genes by binding to sites within distal enhancers. By contrast with its transient effects on core target genes, CREB stimulates pancreatic beta cell specific gene expression in a sustained manner, reflecting increases in the CBP-mediated acetylation of resident nucleosomes that recruit the chromatin reader BRD4. CREB cooperates with the lineage specific activator Neurod1 in establishing cAMP-responsive enhancers in beta cells. As deletion of a CREB-Neurod1 bound enhancer within the Lrrc10b-Syt7 super-enhancer locus disrupted the expression of both genes and decreased glucose-induced insulin secretion, our results demonstrate how cooperativity between signal dependent and lineage determining factors promotes the expression of cell type-specific gene programs in response to extracellular cues.
2019-06-16 | GSE126556 | GEO
Project description:The CREB family of transcription factors stimulates cellular gene expression following phosphorylation at a conserved serine (Ser133 in CREB1) in response to cAMP and other extracellular signals. In order to characterize CREB target genes in various tissues, we give a cAMP agonist, forskolin (FSK), to cell lines or primary cultures and monitor the gene expression. To eliminate CREB-independent effects of FSK on cellular gene expression, we employed a dominant negative form of CREB called A-CREB, which dimerizes selectively with and blocks the DNA binding activity of CREB but not other bZIP family members. Therefore, genes that are induced by cAMP and the induction was blocked by A-CREB treatment likely represents CREB target genes. Notes: 1) In HEK293T cells, besides the Control+FSK+(FSK-ACREB) experiments, a different set of experiments showing FSK effect on 1hr and 4hr is included. The two sets of data in HEK293T were generated at different times with different batch of cells, and comparison should be limited within each set. The cAMP induced genes at 1hr, however, was similar between the two sets. 2) These is no ACREB data for pancreatic islets or hepatocytes. For hepatocytes, however, we have included fasting liver and refed liver in additional to FSK treated primary hepatocytes. During fasting, glucagon induces cAMP increase in the liver and CREB is activated. Therefore, a more reliable list of CREB target genes in hepatocytes can be obtained by selecting those genes are that induced both during fasting and in FSK treated primary culture. Keywords: parallel sample
2005-03-02 | GSE2060 | GEO
Project description:This SuperSeries is composed of the following subset Series:; GSE12341: Expt. A; Daily Rhythm in Expression of >600 Genes in the Rodent Pineal Gland: Dominant Role of Adrenergic/cAMP Signaling; GSE12342: Expt. B; Daily Rhythm in Expression of >600 Genes in the Rodent Pineal Gland: Dominant Role of Adrenergic/cAMP Signaling; GSE12343: Expt. C; Daily Rhythm in Expression of >600 Genes in the Rodent Pineal Gland: Dominant Role of Adrenergic/cAMP Signaling Experiment Overall Design: Refer to individual Series
2009-01-23 | E-GEOD-12344 | biostudies-arrayexpress
Project description:In this study we show that, in embryonic fibroblasts from mice on a high fat diet and treated with Forskolin, ionizing radiation exposure or both, phosphorylation of CREB-binding protein (CREB) by ATM (ataxia-telangiectasia-mutated) and casein kinases 1 and 2 (CK1 and CK2) on a cluster of five phosphorylation sites (the ATM/CK cluster) within the unstructured kinase-inducible domain (KID) provides an additional level of regulation through dynamic modulation of CREB DNA binding activity. Stoichiometric phosphorylation of the ATM/CK cluster in response to DNA damage inhibited cAMP-induced CREB target gene expression, CREB DNA binding activity, and CREB-CRTC2-DNA ternary complex formation proportional to the number of phosphate residues modified. Substoichiometric phosphorylation of the ATM/CK cluster promoted cAMP/Ca2+-regulated transcriptional coactivators (CRTCs) recruitment and CREB activation via an ATM-independent, PKA-dependent pathway. Mice expressing a non-phosphorylatable CREBS111A allele exhibited phenotypes consistent with CREB deregulation, including fasting hyperglycemia, susceptibility to diet-induced obesity, and reduced expression of gluconeogenic genes. Two genotypes: CREB+/+ (wild type) and CREBS111A (non-phosphorylatable CREB KID S111A mutant allele) each control treated, exposed to forskolin, ionizing radiation or both in triplicate and in two batches toataling 48 arrays
2016-07-01 | E-GEOD-83891 | biostudies-arrayexpress
Project description:In this study we show that, in embryonic fibroblasts from mice on a high fat diet and treated with Forskolin, ionizing radiation exposure or both, phosphorylation of CREB-binding protein (CREB) by ATM (ataxia-telangiectasia-mutated) and casein kinases 1 and 2 (CK1 and CK2) on a cluster of five phosphorylation sites (the ATM/CK cluster) within the unstructured kinase-inducible domain (KID) provides an additional level of regulation through dynamic modulation of CREB DNA binding activity. Stoichiometric phosphorylation of the ATM/CK cluster in response to DNA damage inhibited cAMP-induced CREB target gene expression, CREB DNA binding activity, and CREB-CRTC2-DNA ternary complex formation proportional to the number of phosphate residues modified. Substoichiometric phosphorylation of the ATM/CK cluster promoted cAMP/Ca2+-regulated transcriptional coactivators (CRTCs) recruitment and CREB activation via an ATM-independent, PKA-dependent pathway. Mice expressing a non-phosphorylatable CREBS111A allele exhibited phenotypes consistent with CREB deregulation, including fasting hyperglycemia, susceptibility to diet-induced obesity, and reduced expression of gluconeogenic genes.
2016-07-01 | GSE83891 | GEO
Project description:A deeper understanding of the regulation of G protein-coupled receptors (GPCRs) and their associated downstream cascades will provide critical insights into how these pathways shape human physiology and disease, and could yield novel therapeutic targets. Here, we validate and characterize RNA-binding motif 12 (Rbm12) as a repressor of GPCR/cAMP signaling. We established Rbm12 CRISPR KO HEK293 cells using two independent gRNAs and human iPSC-derived neurons (iNeuron) depleted of Rbm12 via CRISPR interference. Then, we performed basal gene expression profiling (HEK293) and basal + beta-2-adrenergic receptor induced (1 hour of 1 uM Isoproterenol) conditions (neurons).
2023-08-02 | GSE219195 | GEO
Project description:The CREB family of transcription factors stimulates cellular gene expression following phosphorylation at a conserved serine (Ser133 in CREB1) in response to cAMP and other extracellular signals. In order to characterize CREB target genes in various tissues, we give a cAMP agonist, forskolin (FSK), to cell lines or primary cultures and monitor the gene expression. To eliminate CREB-independent effects of FSK on cellular gene expression, we employed a dominant negative form of CREB called A-CREB, which dimerizes selectively with and blocks the DNA binding activity of CREB but not other bZIP family members. Therefore, genes that are induced by cAMP and the induction was blocked by A-CREB treatment likely represents CREB target genes. Notes:; 1) In HEK293T cells, besides the Control+FSK+(FSK-ACREB) experiments, a different set of experiments showing FSK effect on 1hr and 4hr is included. The two sets of data in HEK293T were generated at different times with different batch of cells, and comparison should be limited within each set. The cAMP induced genes at 1hr, however, was similar between the two sets. 2) These is no ACREB data for pancreatic islets or hepatocytes. For hepatocytes, however, we have included fasting liver and refed liver in additional to FSK treated primary hepatocytes. During fasting, glucagon induces cAMP increase in the liver and CREB is activated. Therefore, a more reliable list of CREB target genes in hepatocytes can be obtained by selecting those genes are that induced both during fasting and in FSK treated primary culture.
2008-06-12 | E-GEOD-2060 | biostudies-arrayexpress