The role of TMEM43 in cardiac fibrosis and dysfunction
Ontology highlight
ABSTRACT:
ORGANISM(S): Mus musculus
PROVIDER: GSE147317 | GEO | 2021/02/26
REPOSITORIES: GEO
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Project description:Mutations in desmosome genes cause arrhyythmogenic cardiomyopathy (ACM). Using desmoplakin haploinsufficient mouse model of ACM, we evaluated the effects of treadmill exercise on cardiac myocyte transcritional profile. Strand specific, ribosome depleted paired end RNA sequencing of cardiac myocytes from wild type and Myh6-Cre:DspW/F were generate using Illumina HiSeq 4000.
2020-04-29 | GSE129962 | GEO
Project description:Introduction: We have reported that iPSC-cardiac myocytes from patients with arrhythmogenic cardiomyopathy (ACM) mount an intense innate immune response under basal conditions in vitro. In addition, blocking innate immune signaling via NFκB prevents disease in a mouse model of ACM (Dsg2mut/mut mice). Here, we defined the relative pathogenic roles of immune signaling in cardiac myocytes vs. infiltrating inflammatory cells in Dsg2mut/mut mice. Methods: To define the role of immune signaling in cardiac myocytes, we bred Dsg2mut/mut mice with mice with cardiac myocyte-specific expression of a dominant-negative form of IκBα (DN-IκBα), which prevents nuclear translocation and, thereby, activation of NFκB signaling only in cardiac myocytes. To define the role of inflammatory cells in ACM, we focused on cells expressing C-C motif chemokine receptor-2 (CCR2+ cells), known to mediate adverse cardiac remodeling and fibrosis. We bred Dsg2mut/mut mice with germline deletion of Ccr2 mice (Ccr2-/- mice). We compared phenotypes in Dsg2mut/mut mice with double-mutant Dsg2mut/mut X DN-IκB and Dsg2mut/mut X Ccr2-/- lines. Results: Dsg2mut/mut mice develop marked myocardial fibrosis, reduced LV ejection fraction (EF) and many PVCs. These disease features were all normalized in Dsg2mut/mut X DN-IκB mice. Hearts of Dsg2mut/mut and Dsg2mut/mut X DN-IκB mice contained equal numbers of CD68+ macrophages, but Dsg2mut/mut hearts had many more CCR2+ cells. Cardiac myocyte expression of Tlr4 which activates NFκB, was increased in Dsg2mut/mut mice but not in Dsg2mut/mut X Ccr2-/- mice. Dsg2mut/mut X Ccr2-/- mice showed greatly reduced myocardial fibrosis and PVCs but LV EF was markedly depressed. This suggested that contractile dysfunction in ACM is due not only to loss of muscle but to immune signaling in viable cardiac myocytes as well. To test this hypothesis, we treated Dsg2mut/mut and Dsg2mut/mut X Ccr2-/- mice with the NFκB inhibitor Bay 11-7082. Before treatment, LV EFs were significantly reduced in both groups. Untreated Dsg2mut/mut mice had ongoing deterioration of LV function, whereas treated Dsg2mut/mut mice showed no further disease progression and actually had some improvement in contractile function. However, LV function in treated Dsg2mut/mut X Ccr2-/- mice was virtually normalized. Conclusions: NFκB signaling in cardiac myocytes drives myocardial injury, LV dysfunction and arrhythmias in Dsg2mut/mut mice. It also mobilizes CCR2+ cells to the heart, where they promote myocardial injury and arrhythmias. CCR2+ cells alter gene expression in cardiac myocytes. LV dysfunction in Dsg2mut/mut mice is caused not only by muscle loss but also by negative inotropic effects of inflammation mediated by NFκB in viable cardiac myocytes. These results have obvious implications for ACM patients and suggest that anti-inflammatory therapy may be beneficial even in patients with established disease.
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Project description:Hematopoietic mosaic loss of Y chromosome (mLOY) is associated with increased risk of mortality and a variety of age-related diseases in men, but causal and mechanistic relationships have yet to be established. Here it is shown that mice reconstituted with bone marrow cells lacking the Y chromosome display increased mortality and age-related profibrotic pathologies including a progressive decline in cardiac function. Accelerated cardiac dysfunction and fibrosis were also observed in younger mice subjected to a pressure-overload model of heart failure. Bone marrow-derived, cardiac macrophages lacking the Y chromosome exhibited polarization toward a more fibrotic and less inflammatory phenotype. Treatment with a TGFb1 neutralizing antibody led to greater amelioration of heart failure in mice reconstituted with mLOY compared to wild-type bone marrow. Consistent with these data, a prospective study in men revealed that mLOY in blood is associated with an increased risk for cardiovascular disease and heart failure-associated mortality. Together, these results indicate that hematopoietic mLOY contributes to heart failure in men.
2022-08-01 | GSE204732 | GEO
Project description:Background: Arrhythmogenic cardiomyopathy (ACM) is a genetic autosomal disease characterized by abnormal cell-cell adhesion, cardiomyocyte death, progressive fibro-adipose replacement of the myocardium, arrhythmias and sudden death. Several different cell types contribute to the pathogenesis of ACM, including, as recently described, cardiac stromal cells (CStCs). In the present study, we aim to identify ACM-specific expression profiles of human CStCs derived from endomyocardial biopsies of ACM patients and healthy individuals employing TaqMan Low Density Arrays for miRNA expression profiling, and high throughput sequencing for gene expression quantification. Results: We identified 5 miRNAs and 272 genes as significantly differentially expressed. Both the differentially expressed genes as well as the target genes of the ACM-specific miRNAs were found to be enriched in cell adhesion related biological processes. Functional similarity and protein interaction based network analyses performed on the identified deregulated genes, miRNA targets and known ACM-causative genes revealed clusters of highly related genes involved in cell adhesion, extracellular matrix organization, lipid transport and ephrin receptor signaling. Conclusions: We determined for the first time the coding and non-coding transcriptome characteristic of ACM cardiac stromal cells, finding evidence for a potential contribution of miRNAs to ACM pathogenesis or phenotype maintenance. Besides known pathways, we identified also deregulation of genes encoding ephrin receptors and ephrins, thus suggesting a potential involvement of Eph-ephrin signaling in CStCs from ACM hearts.
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Project description:Hematopoietic mosaic loss of Y chromosome (mLOY) is associated with increased risk of mortality and a variety of age-related diseases in men, but causal and mechanistic relationships have yet to be established. Here it is shown that mice reconstituted with bone marrow cells lacking the Y chromosome display increased mortality and age-related profibrotic pathologies including a progressive decline in cardiac function. Accelerated cardiac dysfunction and fibrosis were also observed in younger mice subjected to a pressure-overload model of heart failure. Bone marrow-derived, cardiac macrophages lacking the Y chromosome exhibited polarization toward a more fibrotic and less inflammatory phenotype. Treatment with a TGFb1 neutralizing antibody led to greater amelioration of heart failure in mice reconstituted with mLOY compared to wild-type bone marrow. Consistent with these data, a prospective study in men revealed that mLOY in blood is associated with an increased risk for cardiovascular disease and heart failure-associated mortality. Together, these results indicate that hematopoietic mLOY contributes to heart failure in men.
2022-06-02 | GSE205090 | GEO
Project description:Hematopoietic mosaic loss of Y chromosome (mLOY) is associated with increased risk of mortality and a variety of age-related diseases in men, but causal and mechanistic relationships have yet to be established. Here it is shown that mice reconstituted with bone marrow cells lacking the Y chromosome display increased mortality and age-related profibrotic pathologies including a progressive decline in cardiac function. Accelerated cardiac dysfunction and fibrosis were also observed in younger mice subjected to a pressure-overload model of heart failure. Bone marrow-derived, cardiac macrophages lacking the Y chromosome exhibited polarization toward a more fibrotic and less inflammatory phenotype. Treatment with a TGFb1 neutralizing antibody led to greater amelioration of heart failure in mice reconstituted with mLOY compared to wild-type bone marrow. Consistent with these data, a prospective study in men revealed that mLOY in blood is associated with an increased risk for cardiovascular disease and heart failure-associated mortality. Together, these results indicate that hematopoietic mLOY contributes to heart failure in men.
2022-06-02 | GSE205089 | GEO
Project description:Hematopoietic mosaic loss of Y chromosome (mLOY) is associated with increased risk of mortality and a variety of age-related diseases in men, but causal and mechanistic relationships have yet to be established. Here it is shown that mice reconstituted with bone marrow cells lacking the Y chromosome display increased mortality and age-related profibrotic pathologies including a progressive decline in cardiac function. Accelerated cardiac dysfunction and fibrosis were also observed in younger mice subjected to a pressure-overload model of heart failure. Bone marrow-derived, cardiac macrophages lacking the Y chromosome exhibited polarization toward a more fibrotic and less inflammatory phenotype. Treatment with a TGFb1 neutralizing antibody led to greater amelioration of heart failure in mice reconstituted with mLOY compared to wild-type bone marrow. Consistent with these data, a prospective study in men revealed that mLOY in blood is associated with an increased risk for cardiovascular disease and heart failure-associated mortality. Together, these results indicate that hematopoietic mLOY contributes to heart failure in men.
2022-06-02 | GSE205088 | GEO
Project description:Background. Ageing is one of the main risk factors of cardiovascular disease. Pericytes are capillary-associated mural cells involved in the maintenance and stability of the vascular network. In the heart, the consequences of ageing on cardiac pericytes are unknown. Methods. In this study, we have combined single nucleus RNA sequencing and histological analysis to determine the effects of ageing on cardiac pericytes. Furthermore, we have conducted in vivo and in vitro analysis of RGS5 loss of function and finally have perfomed pericytes-fibroblasts co-culture studies to understand the effect of RGS5 loss of function in pericytes on the neighbouring fibroblasts. Results. We showed that ageing reduces the pericyte area and coverage. Single nucleus RNA sequencing analysis further revealed that the expression of the Regulator of G protein signalling 5 (Rgs5) is reduced in old cardiac pericytes. In vivo and in vitro studies showed that the deletion of RGS5 induces morphological changes and a pro-fibrotic gene expression signature characterized by the expression of different extracellular matrix components and growth factors like TGFB2 and PDGFB in pericytes. Indeed, the culture of fibroblasts with the supernatant of RGS5 deficient pericytes induced their activation characterized by the increased expression of α smooth muscle actin in a TFGβ2 dependent mechanism. Conclusions. Our results identify RGS5 as a crucial regulator of pericyte function during cardiac ageing. The deletion of RGS5 causes cardiac dysfunction and induces myocardial fibrosis, one of the hallmarks of cardiac ageing.
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