Altering sphingolipid metabolism attenuates cell death and inflammatory response after myocardial infarction
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ABSTRACT:
ORGANISM(S): Mus musculus
PROVIDER: GSE138201 | GEO | 2019/10/01
REPOSITORIES: GEO
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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:Myocardial infarction (MI) contributes to cardiac mortality and morbidity. After myocardial infarction the innate immune response is pivotal in clearing of tissue debris as well as scar formation, but exaggerated cytokine and chemokine secretion with subsequent leukocyte infiltration also leads to further tissue damage. Post-translational regulation of cytokine / chemokine signaling occurs via ectodomain shedding through a disintegrin and metalloproteases (ADAMs). Here, we address the value of targeting a previously unknown ADAM10 / CX3CL1 axis in the regulation of neutrophil recruitment early after MI. We show that myocardial ADAM10 is distinctly upregulated in biopsies from patients with ischemia-driven cardiomyopathy and correlates with heart failure progression. Intriguingly, upon MI in mice, pharmacological treatment with the ADAM10 inhibitionor GI254023X as well as genetic cardiomycyte-specific ADAM10 deletion improves survival with markedly enhanced heart function and reduced scar size. Mechanistically, this is driven by abolished ADAM10-mediated CX3CL1 ectodomain shedding followed by diminished IL-1β-dependent inflammation, reduced neutrophil bone marrow egress as well as myocardial tissue infiltration. Genetic cardiomycyte-specific ADAM10 deletion confirmes the small-molecule data and leads to improved cardiac function and reduction in inflammatory markers after ischemic myocardial injury. Thus, our data shows a conceptual insight into how acute MI induces chemotactic signaling via ectodomain shedding in cardiomyocytes.
2022-11-10 | GSE217268 | GEO
Project description:Immune cell infiltration in response to myocyte death contributes to extracellular matrix (ECM) remodeling and scar formation after myocardial infarction (MI). Caspase-recruitment domain protein 9 (CARD9) which belongs to CARD family acts as an adapter that mediate the transduction of proinflammatory signaling cascades in innate immunity. To investigate the role of CARD9 in cardiac injury and repair post ischemia, we subjected Card9 knockout mice to myocardial infarction (MI) , and then performed RNA-seq and gene expression profiling analysis using the ischemic cardiac tissues at 3 days post-MI, to identify key genes and pathways regulated by CARD9.
2023-10-25 | GSE235257 | 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: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: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.
2010-05-01 | GSE19322 | GEO
Project description:Macrophage polarization followed by acute myocardial infarction (MI) is essential for the regulation of inflammation and scar formation. Tripartite motif-containing protein 21 (TRIM21), a member of E3 ubiquitin ligases, is a crucial mediator in the process of inflammation and heart failure. However, the potential roles of TRIM21 in modulating post-MI inflammation and macrophage polarization remain elusive. We detected that the levels of TRIM21 were significantly reduced in macrophages of WT mice after MI. In contrast, MI was ameliorated in TRIM21 knockout (TRIM21-/-) mice with improved cardiac remodeling, characterized by a marked decrease in mortality, increased wall thickness, and improved cardiac function in comparison with wild-type (WT) MI mice. Importantly, TRIM21 deficiency decreased the post-MI apoptosis and DNA damage in the hearts of mice, and the accumulation of M1 phenotype macrophages in infarcted hearts significantly decreased in TRIM21-/- mice compared with WT controls. Mechanistically, depletion of TRIM21 orchestrated the process of M1 macrophage polarization via a PI3K/Akt signaling pathway. Overall, these data reveal that TRIM21 drives the inflammatory response and cardiac remodeling after MI via stimulating M1 macrophage polarization through a PI3K/Akt signaling pathway.
2022-12-31 | GSE214696 | GEO
Project description:Background: Bone marrow-derived multipotent progenitor cell (MPC) transplantation leads to short term functional and bioenergetic improvement in a porcine model of postinfarction Left Ventricular (LV) remodeling despite a low engraftment rate. However, the long term outcome after MPC transplantation is unknown. Methods and Results: The objectives of this study were to determine the long term functional outcome after MPC transplantation in a porcine model of postinfarction LV remodeling and to elucidate its mechanisms. Myocardial infarction (MI) was created by ligating the first and second diagonal branches of the Left anterior descending artery after open thoracotomy. Intramyocardial injection of 50 million lacZ labeled MPC was performed in the periscar region (Cell, n=7) with 5 equal injections immediately after MI, while in control animals (CONT, n=7; only 6 were profiled by microarray) saline was injected. Outcome was assessed temporally for 4 months with MRI and P-31 MRS. Engraftment was studied on histology and gene chip (Affymetrix) array analysis was used to study differential expression of genes in the two groups at 4 months. MPC treatment resulted in improvement of ejection fraction as early as 10 days after MI (32.2±5.5 vs. 43.4±5.1 in CONT and Cell respectively, p <0.05). This improvement was seen each month and persisted up to 4 months (35.7±5.0 vs. 51.2±4.8 in CONT and Cell respectively, p<0.005). PCr/ATP ratio improved with MPC transplantation (1.88±0.11 vs. 2.13±0.13 in CONT and Cell respectively, p<0.05). Under increased workload with inotropic stimulation, the bioenergetic differences were even more pronounced. There was no significant difference in scar size (scar/LV area*100) at 10 days post infarction (9.7±2.3 vs. 8.3±1.5 in CONT and Cell respectively). However, at 4 months there was a significant decrease in scar size in the MPC treated animals (8.6±2.4 vs. 4.6±1.0 in CONT and Cell respectively, p <0.05). No significant engraftment of MPC was observed on histology at 4 months. Gene chip array analysis identified several genes which were differentially expressed in the two groups. MPC transplantation was associated with a downregulation of mitochondrial oxidative enzymes, increased levels of MEF2a (Myocyte Enhancer Factor 2a) and ZFP91 (Zinc finger protein 91). Conclusion: MPC transplantation results in long term improvement in ventricular function and myocardial energetics that is associated with a decreased scar size and differential expression of genes. 13 swine were randomized after myocardial infarction to receive either 50 million stem cells (n=7) or saline only (n=6). The pigs were followed for a total of 4 months after transplantation with MRI occurring at baseline, 10 days, 1 month and then subsequently each month for 4 months. At the end of the study open-chest NMR spectroscopy was performed and then after sacrifice histology and microarray analysis was done on the tissue samples.
2010-04-12 | E-GEOD-14643 | biostudies-arrayexpress
Project description:Adverse cardiac remodeling after myocardial infarction (MI) causes structural and functional changes in the heart leading to heart failure. The initial pro-inflammatory response followed by an anti-inflammatory or reparative response post-MI is essential for minimizing the myocardial damage, healing, and scar formation. Bone marrow-derived macrophages (BMDMs) are recruited to the injured myocardium and essential for cardiac repair as they can adopt both pro-inflammatory (M1) or anti-inflammatory/reparative (M2) phenotypes to modulate inflammatory and reparative response, respectively. YAP and TAZ are the key mediators of the Hippo signaling pathway and essential for cardiac regeneration and repair. However, their role in macrophage polarization and post-MI inflammation, remodeling, and healing are not well established. Here, we demonstrate that expression of YAP and TAZ is increased in macrophages undergoing M1 or M2 polarization. Genetic deletion of YAP/TAZ leads to impaired M1 polarization and enhanced M2 polarization. Consistently, YAP activation/overexpression enhanced M1 and impaired M2 polarization. We show that YAP/TAZ promote M1 polarization by increasing IL6 expression, and impede M2 polarization by decreasing Arg1 expression through interaction with the HDAC3-NCoR1 repressor complex. These changes in macrophages polarization due to YAP/TAZ deletion results in reduced fibrosis, and hypertrophy and increased angiogenesis, leading to improved cardiac function after MI. Also, YAP activation augmented MI-induced cardiac fibrosis and remodeling. In summary, we identify YAP/TAZ as important regulators of macrophage-mediated pro- and anti-inflammatory responses post-MI.
2020-10-02 | GSE158889 | GEO
Project description:Copper coated stent were implanted into the LAD coronary artery of porcine animal weighing between 20-25 kg, which leads to a severe coronary stenosis and myocardial infarct (MI). After MI, Fb are activated throughout the LV, presumably through TGF-β1 in response to increased wall stress and/or inflammation. Additional regional specific signaling leads to interstitial fibrosis via collagen cross-linking in MIadjacent. Local LOX activity could be stimulated by higher mechanical load imposed by tethering to the infarct or signals could diffuse from the scar.Identifying specific signaling cues to maintain the mature state of MyoFb phenotype in the scar tissue may open new perspectives in targeting the MyoFb reversibility in interstitial fibrosis without damaging existing scar tissue.
2017-10-31 | GSE98504 | GEO