TEAD1 in cardiac fibroblast activation
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ABSTRACT:
PROVIDER: PRJNA1064074 | ENA |
REPOSITORIES: ENA
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Project description:Cardiac fibroblasts (CFs) are the primary cells tasked with extracellar matrix reorganization and significantly associated with heart failure (HF). Previous studies have shown that TEAD1 deficiency deteriorated heart development and homeostasis. However, the role of TEAD1 in fibroblasts during cardiac remodeling was still undiscovered. Our study demonstrated that TEAD1 was upregulated predominently in cardiac fibroblasts in mice 4 weeks after transverse aortic constriction (TAC) and Ang-II infusion. Echocardiographic and histological analyses demonstrated that CFs- and myofibroblasts-specific TEAD1 deficiency ameliorated TAC-induced cardiac remodeling and treatment with TEAD1 inhibitor, VT103, mimiced this phenotypic effect. Mechanistically, RNA-seq analysis , ChIP-Seq analysis identified TEAD1 promotes the fibroblast-to-myofibroblast transition through the Wnt signalling pathway. In conclusion, TEAD1 is an essential regulator of the pro-fibrotic CFs phenotype associated with pathological cardiac remodeling via the BRD4/Wnt4 signalling pathway.
2024-01-15 | GSE253118 | GEO
Project description:The function of TEAD1 in cardiac fibroblast activation [ChIP-Seq]
| PRJNA1064079 | ENA
Project description:Cardiac fibroblasts (CFs) are the primary cells tasked with depositing and remodeling collagen and significantly associated with heart failure (HF). TEAD1 has been shown to be essential for heart development and homeostasis. However, endogenous fibroblast TEAD1 in cardiac remodeling remains incompletely understood. Transcriptomic analyses revealed consistently upregulated cardiac TEAD1 expression in mice 4 weeks after transverse aortic constriction (TAC) and Ang-II infusion. Further investigation revealed that CFs were the primary cell type expressing elevated TEAD1 levels in response to pressure overload. Conditional TEAD1 knockout was achieved by crossing TEAD1-floxed mice with CFs- and myofibroblasts-specific Cre mice. Echocardiographic and histological analyses demonstrated that CFs- and myofibroblasts-specific TEAD1 deficiency and treatment with TEAD1 inhibitor, VT103, ameliorated TAC-induced cardiac remodeling. Mechanistically, RNA-seq analysis identified Wnt4 as a novel TEAD1 target. TEAD1 has been shown to promote the fibroblast-to-myofibroblast transition through the Wnt signalling pathway, and genetic Wnt4 knockdown inhibited the pro-transformation phenotype in CFs with TEAD1 overexpression. Furthermore, co-immunoprecipitation combined with mass spectrometry, chromatin immunoprecipitation, and luciferase assays demonstrated interaction between TEAD1 and BET protein BRD4, leading to the binding and activation of the Wnt4 promoter. In conclusion, TEAD1 is an essential regulator of the pro-fibrotic CFs phenotype associated with pathological cardiac remodeling via the BRD4/Wnt4 signalling pathway.
2023-12-28 | GSE251976 | GEO
Project description:Dynamic chromatin targeting of BRD4 stimulates cardiac fibroblast activation
| PRJNA524371 | ENA
Project description:This SuperSeries is composed of the SubSeries listed below.
2024-01-12 | GSE253119 | GEO
Project description:Small molecule inhibitors of the acetyl-histone binding protein BRD4 have been shown to block cardiac fibrosis in pre-clinical models of heart failure (HF). However, the mechanisms by which BRD4 promotes pathological myocardial fibrosis remain unclear. Here, we demonstrate that BRD4 functions as an effector of TGF-b signaling to stimulate conversion of quiescent cardiac fibroblasts into Periostin (Postn)-positive cells that express high levels of extracellular matrix. BRD4 undergoes stimulus-dependent, genome-wide redistribution in cardiac fibroblasts, becoming enriched on a subset of enhancers and super-enhancers, and leading to RNA polymerase II activation and expression of downstream target genes. Employing the SERTA domain-containing protein 4 (Sertad4) locus as a prototype, we demonstrate that dynamic chromatin targeting of BRD4 is controlled, in part, by p38 mitogen-activated protein kinase, and provide evidence of a novel function for Sertad4 in TGF-b-mediated cardiac fibroblast activation. These findings define BRD4 as a central regulator of the pro-fibrotic cell state of cardiac fibroblasts, and establish a signaling circuit for epigenetic reprogramming in HF.
2020-02-25 | GSE127214 | GEO
Project description:RNA-binding proteins control gene expression in cardiac fibroblasts during TGFb-driven fibrotic responses, including the eukaryotic translation initiation factor 4G2 (eIF4G2), which was known to facilitate alternative mRNA translation during cellular stresses. However, the precise role of eIF4G2 in cardiac fibroblast activation in response to fibrotic stress remains unclear. In this study, we found increased eIF4G2 protein levels in the hearts of heart failure patients and myocardial infarcted mice, as well as in TGFb-treated immortalized human and primary mouse cardiac fibroblasts. Depletion of eIF4G2 led to predominant translational downregulation of genes that are enriched in focal adhesion and extracellular matrix pathways. eIF4G2 knockdown reduced the proliferation, migration, and collagen secretion of TGFb-treated cardiac fibroblasts. Mechanistically, we found that the translation of IGFBP7 mRNA relies on eIF4G2, which is crucial for ECM production in response to pro-fibrotic stimuli. The interaction between eIF4G2 and a DEAD box RNA helicase DDX24 can regulate IGFBP7 protein expression in cardiac fibroblasts. Together, these findings suggest that the TGFb-eIF4G2-IGFBP7 axis establishes a novel translational regulatory circuit that governs cardiac fibroblast activation. Furthermore, conditional knockout of Eif4g2 in POSTN-positive myofibroblasts reduced cardiac fibrosis in the myocardial infarction mouse model, thus improving cardiac function. Our study provides insights into the molecular mechanism of eIF4G2-mediated translational regulation of crucial physiological mRNAs during cardiac fibroblast activation.
2024-07-31 | GSE239824 | GEO
Project description:RNA-binding proteins control gene expression in cardiac fibroblasts during TGFb-driven fibrotic responses, including the eukaryotic translation initiation factor 4G2 (eIF4G2), which was known to facilitate alternative mRNA translation during cellular stresses. However, the precise role of eIF4G2 in cardiac fibroblast activation in response to fibrotic stress remains unclear. In this study, we found increased eIF4G2 protein levels in the hearts of heart failure patients and myocardial infarcted mice, as well as in TGFb-treated immortalized human and primary mouse cardiac fibroblasts. Depletion of eIF4G2 led to predominant translational downregulation of genes that are enriched in focal adhesion and extracellular matrix pathways. eIF4G2 knockdown reduced the proliferation, migration, and collagen secretion of TGFb-treated cardiac fibroblasts. Mechanistically, we found that the translation of IGFBP7 mRNA relies on eIF4G2, which is crucial for ECM production in response to pro-fibrotic stimuli. The interaction between eIF4G2 and a DEAD box RNA helicase DDX24 can regulate IGFBP7 protein expression in cardiac fibroblasts. Together, these findings suggest that the TGFb-eIF4G2-IGFBP7 axis establishes a novel translational regulatory circuit that governs cardiac fibroblast activation. Furthermore, conditional knockout of Eif4g2 in POSTN-positive myofibroblasts reduced cardiac fibrosis in the myocardial infarction mouse model, thus improving cardiac function. Our study provides insights into the molecular mechanism of eIF4G2-mediated translational regulation of crucial physiological mRNAs during cardiac fibroblast activation.
2024-07-31 | GSE239823 | GEO
Project description:Dynamic chromatin targeting of BRD4 stimulates cardiac fibroblast activation [RNA-seq_Mm]
| PRJNA530689 | ENA
Project description:Dynamic chromatin targeting of BRD4 stimulates cardiac fibroblast activation [ChIP-seq]
| PRJNA524350 | ENA