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Transcriptomic profiles reveal differences between remote and ischemic myocardium after acute myocardial infarction in swine model

ABSTRACT: The purpose of this study was to unravel the differences in the molecular profile between ischemic and remote myocardium after AMI.

ORGANISM(S): Sus scrofa

PROVIDER: GSE213657 | GEO | 2023/04/05

REPOSITORIES: GEO

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Transcriptomic profiles reveal differences between remote and ischemic myocardium after acute myocardial infarction in swine model

Project description:Transcriptomic profiles reveal differences between remote and ischemic myocardium after acute myocardial infarction in swine model

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Project description:Restoration of blood flow is the definitive therapy to salvage myocardium following ischemic injury. However, sudden restoration of blood flow to the ischemic myocardium causes ischemia reperfusion injury (IRI). Here, the cardioprotective effect of remote ischemic postconditioning (RPostC) was investigated, based on our in vitro rat model of myocardial IRI. Three groups, including Sham, IRI, and IRI+ RPostC, were utilized for the analysis of Affymetrix Rat Gene 2.0 ST chip.

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Genome-wide profiling of cardiac H3K9me2 levels in response to ischemic preconditioning

Project description:H3K9me2 ChIP-Seq of cardiac biopsies from the area at at risk and remote myocardium of mice subjected to ischemic preconditioning. Mice were subjected to ischemic preconditioning (IPC) through reversible ligation of the left coronary artery or a sham procedure. The procedure consisted of 5 minutes of ischemia followed by 5 minutes of reperfusion, repeated 4 times and then followed by a 30 minute reperfusion period. Biopsies were taken from the area at risk (AAR) and remote myocardium (RM) from six IPC mice

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Transcriptomic profiling of cardiac biopsies from mice subjected to ischemic preconditioning

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Epicardial Placement of Human Placental Membrane Protects from Heart Injury in a Swine Model of Myocardial Infarction

Project description:Introduction: Cardiac ischemic reperfusion injury (IRI) is paradoxically instigated by re-establishing blood-flow to ischemic myocardium typically from a myocardial infarction (MI). Although revascularization following MI remains the standard of care, effective strategies remain limited to prevent or attenuate IRI. We hypothesized that epicardial placement of human placental amnion/chorion (HPAC) grafts will protect against IRI. Methods: Using a clinically relevant model of IRI, swine were subjected to 45 minutes percutaneous ischemia followed with (MI+HPAC, n=3) or without (MI only, n=3) HPAC. Cardiac function was assessed by echocardiography, and regional punch biopsies were collected 14 days post-operatively. A deep phenotyping approach was implemented by using histological interrogation and incorporating global proteomics and transcriptomics in non-ischemic, ischemic, and border zone biopsies. Results: Our results established HPAC limited the extent of cardiac injury by 50% (11.02.0% vs 22.03.0%, p=0.039) and preserved ejection fraction in HPAC-treated swine (46.8±2.7% vs 35.8±4.5%, p=0.014). We present comprehensive transcriptome and proteome profiles of infarct (IZ), border (BZ), and remote (RZ) zone punch biopsies from swine myocardium during the proliferative cardiac repair phase 14 days post-MI. Both HPAC-treated and untreated tissues showed regional dynamic responses, whereas only HPAC-treated IZ revealed active immune and extracellular matrix remodeling. Decreased endoplasmic reticulum (ER)-dependent protein secretion and increased anti-apoptotic and anti-inflammatory responses were measured in HPAC-treated biopsies. Discussion: We provide quantitative evidence HPAC reduced cardiac injury from MI in a preclinical swine model, establishing a potential new therapeutic strategy for IRI.

2023-05-30 | GSE228096 | GEO

Transcriptome Profile Reveals Differences between Remote and Ischemic Myocardium after Acute Myocardial Infarction in a Swine Model.

Project description:Acute myocardial infarction (AMI) is the consequence of an acute interruption of myocardial blood flow delimiting an area with ischemic necrosis. The loss of cardiomyocytes initiates cardiac remodeling in the myocardium, leading to molecular changes in an attempt to recover myocardial function. The purpose of this study was to unravel the differences in the molecular profile between ischemic and remote myocardium after AMI in an experimental model. To mimic human myocardial infarction, healthy pigs were subjected to occlusion of the mid-left anterior descending coronary artery, and myocardial tissue was collected from ischemic and remote zones for omics techniques. Comparative transcriptome analysis of both areas was accurately validated by proteomic analysis, resulting in mitochondrion-related biological processes being the most impaired mechanisms in the infarcted area. Moreover, Immune system process-related genes were up-regulated in the remote tissue, mainly due to the increase of neutrophil migration in this area. These results provide valuable information regarding differentially expressed genes and their biological functions between ischemic and remote myocardium after AMI, which could be useful for establishing therapeutic targets for the development of new treatments.

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