Global fibroblast activation in the left ventricle but localized fibrosis after myocardial infarction
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ABSTRACT:
ORGANISM(S): Sus scrofa
PROVIDER: GSE98504 | GEO | 2017/10/31
SECONDARY ACCESSION(S): PRJNA385397
REPOSITORIES: GEO
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Project description:Fibrotic scarring drives the progression of heart failure after myocardial infarction (MI). Therefore, the development of specific treatment regimens to counteract fibrosis is of high clinical relevance. The transcription factor SOX9 functions as an important regulator during embryogenesis, but recent data point towards an additional causal role in organ fibrosis. We show here that SOX9 is upregulated in the scar after MI in mice. Fibroblast specific deletion of Sox9 ameliorated MI-induced left ventricular dysfunction, dilatation and myocardial scarring in vivo. Unexpectedly, deletion of Sox9 also potently eliminated persisting leukocyte infiltration of the scar in the chronic phase after MI. RNA-sequencing from the infarct scar revealed that Sox9 deletion in fibroblasts resulted in strongly downregulated expression of genes related to extracellular matrix, proteolysis and inflammation. Importantly, Sox9 deletion in isolated cardiac fibroblasts in vitro similarly affected gene expression as in the cardiac scar and prevented their activation and myofibroblast differentiation. Together, our data demonstrate that fibroblast SOX9 functions as a master regulator of cardiac fibrosis and inflammation and might constitute a novel therapeutic target during MI.
2019-07-25 | GSE132265 | GEO
Project description:Myocardial infarction (MI) results from occlusion of blood supply to the heart muscle causing death of cardiac muscle cells. Following myocardial infarction (MI), scar formation acts to mechanically stabilise the injured heart to prevent rupture and death. While fibroblasts and macrophages are implicated in post-MI scar formation and maturation, their exact contributions to this process are poorly characterised, especially in the long-term (i.e., beyond 1-week post-MI). Here, we employ state-of-the-art spatially-targetted optical micro-proteomics (STOMP) to isolate proteomes of tissue fractions enriched for fibroblasts (sma+) and macrophages (cd68+) over a 6-week post-MI timecourse and compare them to whole-scar proteome. We illustrate dynamic, specific changes in sma- and cd68-enriched fraction protein composition over 1-6 weeks post-MI with some of these changes reflected in whole-infarct preparations. These results link specific cell populations to specific protein changes in whole infarct.
2023-10-31 | PXD034413 | Pride
Project description:The use of cDNA microarrays has made it possible to analyze expression of thousands of genes simultaneously. We employed microarray gene expression profiling of porcine cDNA to compare myocardial gene expression in infarct core and remote myocardium at 1 week (n=3), 4 weeks (n=3), and 6 weeks (n=3) after surgically induced myocardial infarction (MI) and in sham-operated controls (n=3). More than 8,000 cDNA sequences were identified in myocardium that showed differential expression in response to MI. Different temporal and spatial patterns of gene expression were recognized in the infarct core tissue within this large set of data. Microarray gene profiling revealed candidate genes, some of them described for the first time, which elucidate changes in biological processes at different stages after MI. We evaluated temporal gene expression in a porcine model of myocardial infarction by microarray technology. Nine female pigs (Sus scrofa crossbreed Landrace x Large White) weighing 30-40 kg were subjected to experimental MI by a double-ligation of the first marginal branch of the circumflex artery. Animals were randomly sacrificed at 1 week (n=3), 4 weeks (n=3), or 6 weeks (n=3) after MI. Three paired myocardial samples from the infarct core and remote myocardium were analyzed at each time point. Myocardial samples from sham-operated animals (open-chest cardiac exposure without coronary artery ligation; n=3) were included as physiological controls.
2013-03-01 | E-GEOD-34569 | biostudies-arrayexpress
Project description:Heart failure (HF) is a leading cause of morbidity and mortality. As adult cardiomyocytes (CMs) have little regenerative capacity, after myocardial infarction (MI), resident cardiac fibroblasts (CFs) synthesize extracellular matrix to form scar tissues, resulting in myocardial remodeling and HF. Thus, both cardiac regeneration and fibrosis are therapeutic targets for chronic MI. We previously reported that fibroblasts were directly reprogrammed into induced CMs (iCMs) by overexpression of cardiogenic transcription factors in vitro and in vivo in acute MI. Here we show that in vivo cardiac reprogramming generated iCMs from resident CFs, improved cardiac function, and reversed fibrosis in chronic MI using a novel transgenic mouse system. Transcriptome analysis revealed that in vivo cardiac reprogramming altered the interstitial cell landscape, suppressed signs of fibrosis and inflammation, and activated the angiogenic program. Thus, in vivo cardiac reprogramming may be a promising approach for chronic HF.
2022-12-12 | GSE183932 | GEO
Project description:Tissue repair after myocardial infarction (MI) is guided by incompletely defined autocrine and paracrine-acting proteins. Deciphering these signals and their upstream triggers is essential when considering infarct healing as a therapeutic target. Searching for previously unknown growth factors involved in infarct repair, we performed a bioinformatic secretome analysis in cardiac endothelial cells and identified cysteine-rich with EGF-like domains 2 (CRELD2), an endoplasmic reticulum stress-inducible protein with poorly characterized function. CRELD2 was abundantly expressed and secreted in the heart after MI in mice and patients. Creld2-deficient mice and wild-type mice treated with a CRELD2-neutralizing antibody displayed impaired de novo microvessel formation in the infarct border zone and developed severe postinfarction heart failure. CRELD2 protein therapy, conversely, improved heart function after MI. Exposing human coronary artery endothelial cells to recombinant CRELD2 induced angiogenesis, associated with a distinct phosphoproteome signature. These findings identify CRELD2 as a novel angiogenic growth factor and unravel a link between endoplasmic reticulum stress and ischemic tissue repair.
2023-11-30 | PXD045013 | Pride
Project description:Heart failure (HF) is a leading cause of morbidity and mortality. As adult cardiomyocytes (CMs) have little regenerative capacity, after myocardial infarction (MI), resident cardiac fibroblasts (CFs) synthesize extracellular matrix to form scar tissues, resulting in myocardial remodeling and HF. Thus, both cardiac regeneration and fibrosis are therapeutic targets for chronic MI. We previously reported that fibroblasts were directly reprogrammed into induced CMs (iCMs) by overexpression of cardiogenic transcription factors in vitro and in vivo in acute MI. Here we show that in vivo cardiac reprogramming generated iCMs from resident CFs, improved cardiac function, and reversed fibrosis in chronic MI using a novel transgenic mouse system. Single-cell transcriptome analysis revealed that cardiac reprogramming shifted matrix-producing CFs, matrifibrocytes, to a quiescent state and changed the interstitial cell landscape, suppressing fibrotic and inflammatory signatures and activating angiogenic program. Thus, in vivo cardiac reprogramming may be a promising approach for chronic HF.
2022-12-12 | GSE185265 | GEO
Project description:The Murphy Roth Large (MRL) mouse, a strain capable of regenerating right ventricular myocardium, has a high post-myocardial infarction (MI) survival rate compared with C57BL6/J (C57) mice. The biological processes responsible for this survival advantage are unknown. We compared acute post-MI gene expression in C57 and MRL hearts using microarrays and identified promising candidate biological processes underlying increased survival in the MRL. Hearts from both strains were excised at different time points before or after MI for RNA extraction and hybridization to MOE430A arrays. Baseline hearts were excised from healthy mice that had not undergone the MI procedure (day 0). Infarct tissue in this case means tissue taken from the anterior-apical region that would be the infarct region in a post-MI heart. Non-infarct covers the remainder of the LV. Post-MI hearts were excised either 1 or 5 days after MI. We had successful hybridizations for 3 replicates each of C57 day 0 infarct and non-infarct tissue (6 arrays), 4 MRL day 0 infarct and non-infarct tissue (8 arrays), 4 C57 day 1 infarct and non-infarct tissue (8 arrays), 4 MRL day 1 infarct and non-infarct tissue (8 arrays), 4 C57 day 5 infarct and non-infarct tissue (8 arrays), and 4 MRL day 5 infarct and non-infarct tissue (8 arrays).
2010-05-27 | E-GEOD-19322 | biostudies-arrayexpress
Project description:Background. Accumulation of extracellular matrix in the myocardium attenuates cardiac contractile function, and predisposes to arrhythmias and sudden cardiac death. Connective tissue growth factor (CTGF) is a matricellular protein that has been shown to promote development of cardiac fibrosis. Objectives. To investigate for the potential of CTGF monoclonal antibody (CTGF mAb) in protecting from development of cardiac fibrosis following myocardial infarction (MI), and to evaluate its effect during infarct repair and acute cardiac ischemia-reperfusion (I/R) injury. Methods. Mice were subjected to MI or to I/R injury and treated with either control IgG or CTGF mAb. Cultured human cardiac fibroblasts were used to investigate the signalling mechanisms modulated by CTGF mAb. Results. Treatment with CTGF mAb for four days from day three after MI improved survival, attenuated infarct expansion, and resulted in better preserved left ventricular (LV) systolic function. CTGF mAb therapy for six weeks from day seven after MI reduced the MI-induced increase in cardiomyocyte size, heart weight to body weight ratio and remote LV fibrosis. RNA sequencing analysis of LV samples showed that CTGF mAb induced expression of cardiac repair/developmental genes and normalized the MI-induced increase in expression of inflammatory/profibrotic genes. CTGF mAb induced c-Jun N-terminal kinase (JNK) phosphorylation in vivo and in vitro, and inhibition of JNK abrogated the reduced collagen production in CTGF mAb treated fibroblasts. Conclusions. Treatment with CTGF mAb induces expression of cardiac repair/developmental genes and inhibits expression of inflammatory/pro-fibrotic genes in MI hearts providing benefit during post-MI cardiac repair and reducing post-MI cardiac fibrosis.
2019-04-02 | GSE129134 | GEO
Project description:Background: The adult mammalian heart has limited ability to repair itself following injury. Zebrafish, newts and neonatal mice can regenerate cardiac tissue, largely by cardiac myocyte (CM) proliferation. It is unknown if hearts of young large mammals can regenerate. Methods: We examined the regenerative capacity of the pig heart in neonatal animals (ages: 2, 3 or 14 days postnatal) after myocardial infarction (MI) or sham procedure. Myocardial scar and left ventricular function were determined by cardiac magnetic resonance (CMR) imaging and echocardiography. Bromodeoxyuridine pulse-chase labeling, histology, immunohistochemistry and Western blotting were performed to study cell proliferation, sarcomere dynamics and cytokinesis and to quantify myocardial fibrosis. RNA-sequencing was also performed. Results: After MI, there was early and sustained recovery of cardiac function and wall thickness in the absence of fibrosis in 2-day old pigs. In contrast, older animals developed full-thickness myocardial scarring, thinned walls and did not recover function. Genome wide analyses of the infarct zone revealed a strong transcriptional signature of fibrosis in 14-day old animals that was absent in 2-day old pigs, which instead had enrichment for cytokinesis genes. In regenerating hearts of the younger animals, up to 10% of CMs in the border zone of the MI showed evidence of DNA replication that was associated with markers of myocyte division and sarcomere disassembly. Conclusions: Hearts of large mammals have regenerative capacity, likely driven by cardiac myocyte division, but this potential is lost immediately after birth.
2018-09-12 | GSE115665 | GEO
Project description:Myocardial infarction (MI) often results in left ventricular (LV) remodeling followed by heart failure (HF). It is of great clinical importance to understand the molecular mechanisms that trigger transition from compensated LV injury to HF and to identify relevant diagnostic biomarkers. In this study, we performed transcriptional profiling of LVs in rats with a wide range of experimentally induced infarct sizes and of peripheral blood mononuclear cells (PBMCs) in animals that developed HF. We used microarrays to investigate gene expression in the left ventricle (LV) accompanying myocardial infarction and concomitant heart failure (HF) in a well validated model of post-infarcted heart failure and to evaluate their reflection in peripheral blood mononuclear cells (PBMCs) Myocardial infarction (MI) was induced in male Wistar rats by ligation of the proximal left coronary artery. The sham-operated group (control group) was subjected to the same protocol, except that the suture was not tied around the proximal left coronary artery. Sham-operated rats (n=6) and rats with small (n=6), moderate (n=6), and large (n=5) MI size were included into the experiment two months after the operation. Then, left ventricules and blood samples were obtained for RNA extraction and hybridization on Affymetrix microarrays. Microarrays were used to compare the LV and PBMCs transcriptomes of control and experimental animals. The development of heart failure was estimated by echocardiography and catheterization.
2013-11-15 | E-GEOD-47495 | biostudies-arrayexpress