Analysis of miRNA expression in mouse heart after myocardial infarction
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ABSTRACT:
ORGANISM(S): Mus musculus
PROVIDER: GSE138141 | GEO | 2020/07/24
REPOSITORIES: GEO
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Project description:Alternative splicing of RNA is an underexplored area of transcriptional response. We hypothesized that early changes in alternatively spliced genes may be important for responses to cardiac injury. The goal of this study was to use high throughput sequencing to determine which genes undergo alternative splicing in the initial response to ischemia after myocardial infarction.
2018-05-07 | GSE104187 | GEO
Project description:Background: Ischemic preconditioning (IPC), i.e., brief periods of ischemia, protect the heart from subsequent prolonged ischemic injury, and reduces infarction size. Myocardial stunning refers to transient loss of contractility in the heart after myocardial ischemia that recovers without causing permanent damage. The relationship between IPC and myocardial stunning remains incompletely understood. Purpose: The primary aim of this study was to examine the effects of IPC on the relationship between ischemia duration, stunning, and infarct size in an ischemia-reperfusion injury model. The secondary aim of the study was to examine to which extent the phosphoproteomic changes induced by IPC relate to myocardial contractile function. Methods: Rats were subjected to different durations of left anterior descending artery (LAD) occlusion, with or without preceding IPC. Echocardiograms were acquired at 4 and 48 hours to assess cardiac contraction in the affected myocardial segment. Reversible akinesia was defined as the presence of myocardial akinesia at 4 hours that resolved by 48 hours; and was considered to represent myocardial stunning. Infarction size was evaluated using triphenyl tetrazolium chloride staining. Phosphoproteomic analysis was performed in heart tissue from preconditioned and non-preconditioned animals using nano-liquid chromatography-mass spectrometry. Results: Reversible akinesia was observed in a majority of the rats that were subjected to IPC and subsequently exposed to ischemia of 13.5 or 15 minutes of ischemia (83.3% [n/N] and 66.6% [n/N] respectively). Among rats without IPC, who were exposed to either 10, 11, 12 or 13.5 minutes of ischemia, reversible akinesia was observed in 0% (n/N), 17% (2/12), 0% (n/N) and 0% (n/N) of rats (p<0.001). Phosphoproteomic analysis revealed significant differential regulation of 809 phosphopeptides between IPC and non-IPC groups, with significant associations with the sarcomere, Z-disc, and actin binding. Conclusion: Our study shows that IPC preferentially induces changes in phosphosites of proteins involved in myocardial contraction, and both increases the incidence of reversible post-ischemic myocardial stunning after ischemia-reperfusion injury and reduces infarction size.
2024-05-15 | PXD050441 | Pride
Project description:Very little information is available about non-coding(nc)RNAs and their role in regulating tissue responses in myocardial ischemia and acute infarction. We measured for the first time nascent RNA transcription of protein coding genes, primary(pri)-miRNAs, long non-coding(lnc)RNAs and enhancer(e)RNAs in healthy myocardium, border zone to ischemia and infarction area in pig hearts using GRO-seq. The gene expression analysis indicated a gradient of induction of inflammatory mediators, and repression of PPAR-signaling and oxidative phosphorylation. An exception to rule was A1 adenosine receptor, which exhibited induced gene expression in the border zone, where it might increase myocardial resistance to ischemia, but repression in the ischemic zone. In addition, we interrogated for the first time the transcriptional regulation of pri-miRs and provide evidence that several arrhythmia-related target genes are further repressed at post-transcriptional level. We identified 450 lncRNAs which were differently regulated by ischemia including novel lncRNAs expressed in antisense orientation to major myocardial transcription factors GATA4, GATA6 and KLF6. Finally, characterization of enhancers exhibiting differential expression of eRNAs, pointed a central role for KLF, MEF2C, ETS, NFY, ATF, E2F2 and NRF1 transcription factors in determining tissue-specific responses to ischemic insult. In conclusion, GRO-Seq allowed us to follow the gradient of gene expression occurring in the ischemic heart and identify novel ncRNAs regulated by oxygen deprivation. These findings have identified potential new targets for diagnosis and treatment of myocardial ischemia based on acute changes in eRNA, lncRNA and miRNA expression in the affected heart.
2017-06-19 | GSE81155 | GEO
Project description:We established a rat model of myocardial Infarction by performing a surgical operation of left anterior descending coronary artery occlusion under sterie conditions. Wistar rats were previously randomly divided into 4 groups: control, ischemia, ischemia-propranolol, and non-ischemia-propranolol. Our data suggested that propranolol could reverse many microRNAs with too high or too low expression in the ischemia group versus control group.
2009-11-19 | GSE18129 | GEO
Project description:The use of anthracycline antibiotics such as doxorubicin (DOX) has greatly improved the mortality and morbidity of cancer patients. However, the associated risk of cardiomyopathy has limited their clinical application. DOX-associated cardiotoxicity is irreversible and progresses to heart failure (HF). For this reason, a better understanding of the molecular mechanisms underlying these adverse cardiac effects is essential to develop improved regimes that include cardioprotective strategies. MicroRNAs (miRNAs) are short non-coding RNAs that are able to post-trascriptionally regulate gene expression. MiRNAs have been demonstrated to be involved in both cancer and cardiovascular disease. Therefore, we were interested in unveiling the potential role of miRNAs in chemotherapy-induced HF. We used a combination of three different models to recreate this cardiac toxicity (acute in vitro DOX treatment, DOX-induced HF in vivo and a myocardial infarction -MI- leading to failure model) to study the pattern of dysregulated miRNAs. Using RNA from all three conditions, miRNA microarray profiling was performed and a common miRNA signature was identified. Interestingly, these dysregulated miRNAs have been previously identified as involved in the failing heart. Our results suggest that DOX is able to alter the expression of miRNAs implicated in HF, in vitro as well as in vivo. The present study is a microRNA profiling of the damaged cardiac muscle (cardiomyocyte cell population), following either myocardial infarction (MI) induction or doxorubicin (DOX) treatment. Two DOX-treated models were included: ARC exposed to DOX in vitro and a validated DOX-induced heart failure model generated by repeated administration of DOX injections.
2013-01-29 | E-GEOD-36239 | biostudies-arrayexpress
Project description:Affymetrix microarray analysis of molecular changes after myocardial infarction. Samples of heart tissue were analyzed after myocardial infarction from WT and reg3beta knock-out mice. Samples from scar tissue and samples adjacent to the scar were analyzed. In the experiment we primarily compared infarction zone of wild-type to infarction zone of knock-out animals, and remote zone of wild-type to remote zone of knock-outs.
2015-06-29 | E-MTAB-2561 | biostudies-arrayexpress
Project description:Comparison of both LncRNAs and mRNAs expression in the border zone of the myocardial infarction rats and the sham operation rats Border zone (BZ) of the myocardial infarction is critical to patients. Current treatments of myocardial infarction are primarily aimed to save the dying myocardial cell in the border zone. During myocardial infarction, certain changes in BZ, e.g, apoptosis, fibrosis, inflammation, etc, played an important role in deciding the survival. Impairment and recovery of BZ has been linked to gene expression changes. The aim of our study was to obtain a global expression profile of lncRNAs and mRNAs of the border zone in Wistar rats myocardial infarction, and identify the changes during myocardial infarction.
2016-12-02 | GSE90745 | GEO
Project description:Identification of the genes whose expresion levels are changed by the operation of myocardial infarction in C57BL/6J mice
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Project description:We demonstrate an age-independent loss of type H bone endothelium in heart failure after myocardial infarction in both mice and in humans. Using single-cell RNA sequencing, we delineate the transcriptional heterogeneity of human bone marrow endothelium showing increased expression of inflammatory genes, including IL1B and MYC, in ischemic heart failure. Endothelial-specific overexpression of MYC was sufficient to induce type H bone endothelial cells, whereas inhibition of NLRP3-dependent IL-1 production partially prevents the post-myocardial infarction loss of type H vasculature in mice.
2021-05-13 | E-MTAB-10448 | biostudies-arrayexpress
Project description:We demonstrate an age-independent loss of type H bone endothelium in heart failure after myocardial infarction in both mice and in humans. Using single-cell RNA sequencing, we delineate the transcriptional heterogeneity of human bone marrow endothelium showing increased expression of inflammatory genes, including IL1B and MYC, in ischemic heart failure. Endothelial-specific overexpression of MYC was sufficient to induce type H bone endothelial cells, whereas inhibition of NLRP3-dependent IL-1 production partially prevents the post-myocardial infarction loss of type H vasculature in mice.
2021-05-11 | E-MTAB-10432 | biostudies-arrayexpress