BEX1 is an RNA-dependent mediator of cardiomyopathy [RNA-Seq]
Ontology highlight
ABSTRACT:
ORGANISM(S): Rattus norvegicus
PROVIDER: GSE95523 | GEO | 2017/10/10
SECONDARY ACCESSION(S): PRJNA377325
REPOSITORIES: GEO
Similar Datasets
Project description:Regulation of mRNA splicing, processing and stability is increasingly recognized as a critical control point in dynamically altering gene expression during stress or disease states. Very little is understood of this process in the heart despite the wide ranging changes in gene expression that occurs during heart failure; a disease of epidemic proportions in the western world. Here we identified BEX1 as a heart-failure-induced gene and identified its function as an mRNA binding protein responsible for enhancing expression of a subset of cardiac disease promoting genes. Modeling this increase in BEX1 that occurs in disease, BEX1 cardiac-specific overexpressing transgenic mice were generated and shown to have worse cardiac disease with stress stimulation while Bex1 gene-deleted mice were protected from insults that would otherwise promote heart failure. Since BEX1 was of unknown molecular function we performed a series of proteomic and interactive screening assays, which identified Bex1 as part of a large ribonucleoprotein processing complex involved in regulating pro-inflammatory mRNA expression in the heart. Specifically, induction of BEX1 augmented the stability and expression of AU-rich element containing mRNAs typically found within pro-inflammatory genes. Thus, BEX1 functions as an mRNA modulatory effector that augments pathology promoting gene expression during heart failure.
2017-10-10 | GSE95522 | GEO
Project description:Heart failure is characterized by the inability of the heart to pump effectively and generate proper blood circulation to meet the body's needs; it is a devastating condition that affects more than 100 million people globally. In spite of this, little is known about the mechanisms regulating the transition from cardiac hypertrophy to heart failure. Previously, we identified a cardiomyocyte-enriched gene, CIP, which regulates cardiac homeostasis under pathological stimulation. Here, we show that the cardiac transcriptional factor GATA4 binds the promotor of CIP gene and regulates its expression. We further determined that both CIP mRNA and protein decrease in diseased human hearts. In a mouse model, induced cardiac-specific overexpression of CIP after the establishment of cardiac hypertrophy protects the heart by inhibiting disease progression toward heart failure. Transcriptome analyses revealed that the IGF, mTORC2 and TGFβ signaling pathways mediate the inhibitory function of CIP on pathologic cardiac remodeling. Our study demonstrates GATA4 as an upstream regulator of CIP gene expression in cardiomyocytes, as well as the clinical significance of CIP expression in human heart disease. More importantly, our investigation suggests CIP is a key regulator of the transition from cardiac hypertrophy to heart failure. The ability of CIP to intervene in the onset of heart failure suggests a novel therapeutic avenue of investigation forthe prevention of heart disease progression.
2022-03-05 | GSE194149 | GEO
Project description:Alternative mRNA splicing is an important mechanism for regulation of gene expression. Changes in gene expression contribute to the pathogenesis of heart failure. However, changes in mRNA splicing have not been systematically examined in heart disease. We hypothesized that mRNA splicing is changed in diseased hearts. We used the Affymetrix exon array, which separately measures expression of each known and computationally predicted exon, to globally evaluate changes in mRNA splicing in left ventricular myocardial RNA from control and ischemic cardiomyopathy (ICM) patients. We found that mRNA splicing is systematically changed in heart failure. RTPCR validated 9 previously unreported alternative splicing events. Furthermore, we demonstrated that the splicing of four key sarcomere genes, cardiac troponin T (TNNT2), cardiac troponin I (TNNI3), myosin heavy chain 7 (MYH7), and filamin C (FLNC), was significantly altered in ICM. Altered splicing of these genes in heart disease was confirmed in independent ICM samples, and in dilated cardiomyopathy and aortic stenosis. The minor variant fraction of these five genes was sufficient to classify samples into control or disease groups with 95% accuracy. Our data indicate that alternative splicing is systematically altered in human heart disease, suggesting that disease-associated perturbation of RNA splicing may contribute to the pathogenesis and development of heart failure. Disease-related changes in splicing of sarcomere genes may directly impact cardiomyocyte function.
2010-01-11 | GSE16499 | GEO
Project description:A proliferated and post-translationally modified microtubule network underlies cellular growth in cardiac hypertrophy and contributes to contractile dysfunction in heart failure. Yet how the heart achieves this modified network is poorly understood. Determining how the “tubulin code” – the permutations of tubulin isoforms and post-translational modifications - is rewritten upon cardiac stress may provide new targets to modulate cardiac remodeling. Further, while tubulin can autoregulate its own expression, it is unknown if autoregulation is operant in the heart or tuned in response to stress. Here we use heart failure patient samples and murine models of cardiac remodeling to interrogate transcriptional, autoregulatory, and post-translational mechanisms that contribute to microtubule network remodeling at different stages of heart disease. We find that autoregulation is operant across tubulin isoforms in the heart and leads to an apparent disconnect in tubulin mRNA and protein levels in heart failure. We also find that within 4 hours of a hypertrophic stimulus and prior to cardiac growth, microtubule detyrosination is rapidly induced to help stabilize the network. This occurs concomitant with rapid transcriptional and autoregulatory activation of specific tubulin isoforms and microtubule motors. Upon continued hypertrophic stimulation, there is an increase in post-translationally modified microtubule tracks and anterograde motors to support cardiac growth, while total tubulin content increases through progressive transcriptional and autoregulatory induction of tubulin isoforms. Our work provides a new model for how the tubulin code is rapidly rewritten to establish a proliferated, stable microtubule network that drives cardiac remodeling, and provides the first evidence of tunable tubulin autoregulation during pathological progression.
2022-01-28 | GSE194394 | GEO
Project description:A proliferated and post-translationally modified microtubule network underlies cellular growth in cardiac hypertrophy and contributes to contractile dysfunction in heart failure. Yet how the heart achieves this modified network is poorly understood. Determining how the “tubulin code” – the permutations of tubulin isoforms and post-translational modifications - is rewritten upon cardiac stress may provide new targets to modulate cardiac remodeling. Further, while tubulin can autoregulate its own expression, it is unknown if autoregulation is operant in the heart or tuned in response to stress. Here we use heart failure patient samples and murine models of cardiac remodeling to interrogate transcriptional, autoregulatory, and post-translational mechanisms that contribute to microtubule network remodeling at different stages of heart disease. We find that autoregulation is operant across tubulin isoforms in the heart and leads to an apparent disconnect in tubulin mRNA and protein levels in heart failure. We also find that within 4 hours of a hypertrophic stimulus and prior to cardiac growth, microtubule detyrosination is rapidly induced to help stabilize the network. This occurs concomitant with rapid transcriptional and autoregulatory activation of specific tubulin isoforms and microtubule motors. Upon continued hypertrophic stimulation, there is an increase in post-translationally modified microtubule tracks and anterograde motors to support cardiac growth, while total tubulin content increases through progressive transcriptional and autoregulatory induction of tubulin isoforms. Our work provides a new model for how the tubulin code is rapidly rewritten to establish a proliferated, stable microtubule network that drives cardiac remodeling, and provides the first evidence of tunable tubulin autoregulation during pathological progression.
2022-01-28 | GSE194393 | GEO
Project description:A proliferated and post-translationally modified microtubule network underlies cellular growth in cardiac hypertrophy and contributes to contractile dysfunction in heart failure. Yet how the heart achieves this modified network is poorly understood. Determining how the “tubulin code” – the permutations of tubulin isoforms and post-translational modifications - is rewritten upon cardiac stress may provide new targets to modulate cardiac remodeling. Further, while tubulin can autoregulate its own expression, it is unknown if autoregulation is operant in the heart or tuned in response to stress. Here we use heart failure patient samples and murine models of cardiac remodeling to interrogate transcriptional, autoregulatory, and post-translational mechanisms that contribute to microtubule network remodeling at different stages of heart disease. We find that autoregulation is operant across tubulin isoforms in the heart and leads to an apparent disconnect in tubulin mRNA and protein levels in heart failure. We also find that within 4 hours of a hypertrophic stimulus and prior to cardiac growth, microtubule detyrosination is rapidly induced to help stabilize the network. This occurs concomitant with rapid transcriptional and autoregulatory activation of specific tubulin isoforms and microtubule motors. Upon continued hypertrophic stimulation, there is an increase in post-translationally modified microtubule tracks and anterograde motors to support cardiac growth, while total tubulin content increases through progressive transcriptional and autoregulatory induction of tubulin isoforms. Our work provides a new model for how the tubulin code is rapidly rewritten to establish a proliferated, stable microtubule network that drives cardiac remodeling, and provides the first evidence of tunable tubulin autoregulation during pathological progression.
2022-01-28 | GSE194392 | GEO
Project description:A proliferated and post-translationally modified microtubule network underlies cellular growth in cardiac hypertrophy and contributes to contractile dysfunction in heart failure. Yet how the heart achieves this modified network is poorly understood. Determining how the “tubulin code” – the permutations of tubulin isoforms and post-translational modifications - is rewritten upon cardiac stress may provide new targets to modulate cardiac remodeling. Further, while tubulin can autoregulate its own expression, it is unknown if autoregulation is operant in the heart or tuned in response to stress. Here we use heart failure patient samples and murine models of cardiac remodeling to interrogate transcriptional, autoregulatory, and post-translational mechanisms that contribute to microtubule network remodeling at different stages of heart disease. We find that autoregulation is operant across tubulin isoforms in the heart and leads to an apparent disconnect in tubulin mRNA and protein levels in heart failure. We also find that within 4 hours of a hypertrophic stimulus and prior to cardiac growth, microtubule detyrosination is rapidly induced to help stabilize the network. This occurs concomitant with rapid transcriptional and autoregulatory activation of specific tubulin isoforms and microtubule motors. Upon continued hypertrophic stimulation, there is an increase in post-translationally modified microtubule tracks and anterograde motors to support cardiac growth, while total tubulin content increases through progressive transcriptional and autoregulatory induction of tubulin isoforms. Our work provides a new model for how the tubulin code is rapidly rewritten to establish a proliferated, stable microtubule network that drives cardiac remodeling, and provides the first evidence of tunable tubulin autoregulation during pathological progression.
2022-01-28 | GSE194391 | GEO
Project description:Aims and introduction: Cardiac fibrosis is the hallmark of cardiac disease, particularly myocardial infarction (MI), and is one of the most prevalent causes of heart failure. MI is intricately linked to inflammation, extracellular matrix (ECM) remodelling, and cardiac fibrosis, however the mechanisms underpinning these events remain poorly understood. We recently identified that ECM1 has potential to play a key role in cardiac wound healing but the cellular origins in the heart and specific mechanisms of ECM1 in fibrosis remain elusive. Therefore, we investigated the spatiotemporal, cell specific, expression profile of ECM1 in the healthy and diseased mouse and human heart and investigate ECM1 dependent human cardiac fibroblast (HuCFb) cell signalling mechanisms. Methods and results: Western blotting, immunohistochemistry (IHC) and mRNA in-situ hybridisation revealed that ECM1 protein expression was significantly upregulated in human ischaemic and dilated heart failure patients, and predominantly localised interstitially to fibrotic, inflammatory, and peri-vascular areas. ECM1 specific analysis of the Litviňuková et al. (2020) single-cell and -nuclei RNA sequencing (sc/snRNAseq) dataset of healthy human hearts, and the Farbehi et al. (2019) scRNAseq dataset of mouse hearts post-MI demonstrated that ECM1 expression originates from fibroblasts, macrophages, and pericytes/vascular mural cells in the heart. Further, we identify that post-MI ECM1 is expressed in a temporal dynamic flux from unactivated fibroblasts in sham-operated mice, to M1 macrophages (M1MΦ) at day-3, and myofibroblasts and M2MΦ at day-7. Phosphoproteomics of ECM1 treated human cardiac fibroblast cells (HuCFb) alongside ECM1 to HuCFb cell surface protein binding pull-down and mass spectrometry, revealed that ECM1 signalling goes via proteins associated with Rho protein signal transduction, cell-cell adhesion, microtubule dynamics, and cell chemotaxis pathways, potentially initiated by ECM1 to CTNND1 binding on the cell surface. Further mechanistic analyses identified that ECM1 inhibits HuCFb cell migration and stimulates inflammatory (IL-6 and IL-1β mRNA expression), fibrotic (TGF-β1, TGF-β2 and Col1a2 mRNA expression), and non-canonical Wnt signalling pathways (Wnt5a mRNA expression and JNK1/2/3 and MYPT1 phosphorylation). Conclusions: This study demonstrates that ECM1 expression originates from macrophages and fibroblasts in the mouse and human heart. ECM1 has significant effects on HuCFb migration, inflammatory, fibrotic, Rho protein, and Wnt5a/non-canonical Wnt signalling pathways. Together, ECM1 plays an important role in cardiac wound healing and may represent a novel mechanism of inflammation-fibrosis crosstalk and progression post-MI.
2024-01-26 | PXD027626 | Pride
Project description:We aimed to identify gene variants associated with heart failure by using a rat model of the human disease. We performed invasive cardiac hemodynamic measurements in F2 crosses between spontaneously hypertensive heart failure rats (SHHF) and reference strains. We combined linkage analyses with genome-wide expression profiling .
2008-09-01 | E-TABM-418 | biostudies-arrayexpress
Project description:Dysfunctional Parkin-mediated mitophagic culling of senescent or damaged mitochondria is a major pathological process underlying Parkinson disease and a potential genetic mechanism of cardiomyopathy. Despite epidemiological associations between Parkinson disease and heart failure, the role of Parkin and mitophagic quality control in maintaining normal cardiac homeostasis is poorly understood.We used germline mutants and cardiac-specific RNA interference to interrogate Parkin regulation of cardiomyocyte mitochondria and examine functional crosstalk between mitophagy and mitochondrial dynamics in Drosophila heart tubes. 5 wild-type mouse hearts; 4 germline Parkin knockout mouse hearts Please note that the mouse cardiac examples were an adjunct to the Drosophila studies that comprised most of the associated publication. However, mRNA-sequencing was only performed on the mouse samples, not the Drosophila heart tubes.
2015-10-31 | E-GEOD-74517 | biostudies-arrayexpress