Genome-wide analysis of gene expression changes in miR-214 KO mouse hearts and skeletal muscle
Ontology highlight
ABSTRACT:
ORGANISM(S): Mus musculus
SUBMITTER: Arin Aurora
PROVIDER: E-GEOD-35421 | biostudies-arrayexpress |
REPOSITORIES: biostudies-arrayexpress
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Project description:Early reperfusion of ischemic cardiac tissue remains the most effective intervention for improving clinical outcome following myocardial infarction. However, abrupt increases in intracellular Ca2+ during myocardial reperfusion cause cardiomyocyte death and consequent loss of cardiac function, referred to as ischemia/reperfusion (IR) injury. Cardiac IR is accompanied by dynamic changes in expression of microRNAs (miRNAs), which inhibit specific mRNA targets. miR-214 is up-regulated during ischemic injury and heart failure in mice and humans, but its potential role in these processes is unknown. We show that genetic deletion of miR-214 in mice causes loss of cardiac contractility, increased apoptosis, and excessive fibrosis in response to IR injury.
2012-01-31 | GSE35421 | GEO
Project description:Coronary heart disease is the leading cause of death worldwide. After an acute myocardial infarction, early reperfusion reduces infarct size, which correlates with improved clinical outcomes. Paradoxically, reperfusion although relieving ischemia, accelerates apoptosis in injured cardiomyocytes, which has led to the view that myocardial salvage is futile beyond the first few hours of reperfusion. In murine hearts subjected to 90 min of coronary artery occlusion and then 48 h of reperfusion, we show transient activation of intrinsic prosurvival insulin-like growth factor-1 (IGF-1) signaling. In these hearts, acute IGF-1 receptor inhibition decreases the abundance of prosurvival signaling molecules, and markedly activates caspase-3, a potent effector of apoptosis, in infarct border zone cardiomyocytes. We found that mouse mast cell protease-4 (MMCP-4) degraded IGF-1 in vitro by a novel catalytic activity of chymases. In vivo, this degradation, which is triggered by mast cell infiltration into the peri-infarct region and MMCP-4 extravasation, between 48 and 72 h post-ischemia/reperfusion (I/R), attenuates IGF-1 prosurvival signaling. In MMCP-4-deficient mice, while infarct size is not reduced at 24 h post-I/R, at 72 h post-I/R myocardial IGF-1 levels and signaling are increased, resulting in activation of the survival kinases Akt and ERK, inhibition of caspase-3, and reduced myocardial cell death. As a consequence, I/R-mediated loss of viable myocardium, adverse cardiac remodeling and contractile impairment are markedly reduced. Cardiomyocyte survival with consequent myocardial salvage may thus be possible even days after an ischemic insult, making them a novel therapeutic target for delayed cardioprotective therapy. Group 1 is wild type C57Bl6 uninjured hearts. These mice were not undergone any surgery and used as controls. Group 2 are wild type C57Bl6 72 h post-ischemia reperfusion (IR) injury hearts. These mice for subjected to ischemia reperfusion (IR) involving 90 min of left anterior descending coronary artery occlusion followed by reperfusion for 3 days or 72 h.
2015-09-01 | E-GEOD-61592 | biostudies-arrayexpress
Project description:Cardiac resident MerTK+ macrophages exert multiple protective roles post-ischemic injury. To determine the potential reason for the protective role of MerTK+ cardiac macrophages, microarray was performed to identify gene expression profiles on isolated Trem2+, MHCII+, Lyve1+, and MerTK- macrophages from the heart tissue of WT mice post-IR. We investigated the potential reason for the protective role of MerTK+ cardiac macrophages in myocardial Ischemia reperfusion injuryby microarray.
2023-10-31 | GSE246339 | GEO
Project description:This study was a part of a larger study assessing the response of young pigs to cardiac ischemia/reperfusion (IR) injury. A mild cardiac injury approach (IR) was used in post-weaned pigs (1-month), to assess regenerative repair in young large mammals after transient ischemic injury. Female and male postnatal day (P)30 pigs were subjected to cardiac ischemia (1-hour) by occlusion of the left anterior descending artery followed by reperfusion (IR), or to sham operation. In pigs subjected to IR, myocardial damage occurred, indicated by increased circulating cardiac troponin I 2-hours post-ischemia. In addition, cardiac ejection fraction (EF) was significantly decreased 2-hours post-ischemia and reduced EF was maintained to the 4-week study end-point. Histology demonstrated evidence of CM cell cycling at 2-months of age in multinucleated CMs in both sham-operated and IR pigs. Following IR, regional scar formation and inflammation in the epicardial region proximal to injury were observed 4-weeks post-IR. Sex differences in cardiac function and collagen deposition were found, highlighting the importance of representing both sexes in cardiac injury studies. Together, our results describe an effective novel cardiac injury model in 1-month old swine, at a time when CM are still cycling. However, pigs subjected to IR show a prolonged decrease in cardiac function, and the formation of a small, regional scar with increased inflammation. Together, these data demonstrate that 1-month old pigs do not regenerate myocardium, but form a scar, after transient IR injury.
2020-04-27 | GSE137293 | GEO
Project description:The management of cardiac ischemic injury has been challenged by ischemia and reperfusion (I/R) injury. Reactive oxygen species (ROS) generated from mitochondrial reverse electron transport (RET) during the early phase of reperfusion is considered to be the initiating cause for ischemia and reperfusion injury. Ginsenosides and their prescriptions are widely used in the clinic for treatment of myocardial ischemia, however, the action to combat ROS remains to be elucidated. In this work, we used TMT-based proteomic approach to detect differential proteins from mitochondrial fractions of mice hearts with ischemia-reperfusion. Results indicated that the mass error of identified peptides was within 10 ppm, and most of the identified peptides were composed of 7-23 amino acids. Using these qualified data, 17,262 peptides, with a confidence level ≥ 95%, were mapped to 3,054 protein groups. PCA analysis showed that the model group was clearly separated from the blank group, while the protein pattern was partly reversed with Rb1 treatment. With a criteria of p-value < 0.05, 591 significantly changed proteins including 186 increased and 405 decreased ones in the model group were identified compared with the blank group. These proteins were divided into 4 clusters. Proteins in Cluster I highly increased in the model group, but clearly decreased in the Rb1 group. Proteins in Cluster IV clearly decreased in the model group, but markedly increased in the Rb1 group. Proteins in Cluster III and in Cluster IV were not significantly or slightly regulated by the Rb1 treatment. GO analysis of Cluster I and II indicated that the molecular function of these proteins were closely related to oxidoreductase activity and NADH dehydrogenase activity. Our result showed that Rb1 administration before ischemia markedly decreased infarct size (48 h post-I/R), and preserved cardiac function (2 weeks post-I/R), and subsequently limited tissue fibrosis (28 days post-I/R). These results indicated that targeted inhibition of mitochondrial complex I in the early stage of reperfusion by Rb1 is a potential therapeutic strategy for alleviating IR injury. This work not only indicates a potent molecular target for the precision therapy of myocardial ischemia by Rb1, but also provides novel knowledge for the management of cardiac ischemic injury by traditional Chinese medicine.
2021-09-08 | PXD011414 | Pride
Project description:Adult mammalian hearts do not regenerate following ischemic injury, causing permanent damage to the myocardium, often leading to heart failure. In contrast, neonatal mouse hearts can fully regenerate after injury, however this ability is lost shortly after birth. Loss of regenerative capacity coincides with profound changes in the epigenetic landscape. Yet, the mechanisms controlling cardiomyocyte proliferation remain poorly understood. To identify epigenetic mechanisms that underlie cardiomyocyte regeneration in response to ischemic injury, we subjected mice to sham or ischemia-reperfusion injury (IR) and performed RNA-Seq at multiple timepoints after injury. Multiple SWI/SNF chromatin remodeling complex subunits were upregulated after IR, including the AT-rich interactive domain-containing protein 1A (Arid1a), which has previously been implicated in tissue regeneration. Here, we show that Arid1a is abundantly expressed in cardiomyocytes during development, and is reactivated in a subset of adult cardiomyocytes after IR. Moreover, ARID1A is highly expressed in cardiomyocytes in human failing hearts, suggesting an important function in injury response. Cardiomyocyte-specific Arid1a ablation in neonatal mice induced cardiomyocyte hyperplasia, and severe cardiac enlargement at 2 weeks of age. Arid1a mutant hearts display increased expression of key cell cycle genes. Using ChIP-Seq and protein interaction studies we show that Arid1a functionally interacts with HIPPO signaling, thereby regulating neonatal cardiomyocyte proliferation. Furthermore, suppression of Arid1a in adult cardiomyocytes after IR induced cell cycle activity in border zone cardiomyocytes. These data suggest that Arid1a regulates cardiomyocyte proliferation and function. Upregulation of Arid1a in cardiomyocytes after injury may suppress proliferation and regeneration. Modulation of ARID1A after ischemic injury may be a novel therapeutic target to enhance cardiac regeneration.
2023-07-06 | GSE155100 | GEO
Project description:Adult mammalian hearts do not regenerate following ischemic injury, causing permanent damage to the myocardium, often leading to heart failure. In contrast, neonatal mouse hearts can fully regenerate after injury, however this ability is lost shortly after birth. Loss of regenerative capacity coincides with profound changes in the epigenetic landscape. Yet, the mechanisms controlling cardiomyocyte proliferation remain poorly understood. To identify epigenetic mechanisms that underlie cardiomyocyte regeneration in response to ischemic injury, we subjected mice to sham or ischemia-reperfusion injury (IR) and performed RNA-Seq at multiple timepoints after injury. Multiple SWI/SNF chromatin remodeling complex subunits were upregulated after IR, including the AT-rich interactive domain-containing protein 1A (Arid1a), which has previously been implicated in tissue regeneration. Here, we show that Arid1a is abundantly expressed in cardiomyocytes during development, and is reactivated in a subset of adult cardiomyocytes after IR. Moreover, ARID1A is highly expressed in cardiomyocytes in human failing hearts, suggesting an important function in injury response. Cardiomyocyte-specific Arid1a ablation in neonatal mice induced cardiomyocyte hyperplasia, and severe cardiac enlargement at 2 weeks of age. Arid1a mutant hearts display increased expression of key cell cycle genes. Using ChIP-Seq and protein interaction studies we show that Arid1a functionally interacts with HIPPO signaling, thereby regulating neonatal cardiomyocyte proliferation. Furthermore, suppression of Arid1a in adult cardiomyocytes after IR induced cell cycle activity in border zone cardiomyocytes. These data suggest that Arid1a regulates cardiomyocyte proliferation and function. Upregulation of Arid1a in cardiomyocytes after injury may suppress proliferation and regeneration. Modulation of ARID1A after ischemic injury may be a novel therapeutic target to enhance cardiac regeneration.
2023-07-06 | GSE155101 | GEO
Project description:Background The axon guidance cue Slit2 recently has been found to regulate calcium homeostasis and molecular signaling in various stress events in different organs. However, whether Slit2 plays a role in cardiac ischemia-reperfusion (IR) injury has not been reported. Here, we aimed to investigate the role of Slit2 and the underlying mechanisms in cardiac IR injury. Methods Langendorff-perfused isolated hearts from Slit2-overexpressing (Slit2-Tg) mice and their background strain C57BL/6J mice were subjected to 20 min of global ischemia followed by 40 min of reperfusion. Left ventricular function of isolated hearts was monitored. Infarct size of post-IR hearts was determined by staining with 2,3,5-triphenyltetrazolium chloride (TTC) and histological changes of cardiac tissues and cells were determined with hematoxylin-eosin (HE) staining and transmission electron microscopy. Transcriptomic analysis was used to predict the biological processes and signaling pathways affected by Slit2 overexpression in the post-IR myocardium. Pro-Q staining and Western blotting was used to assess the phosphorylation levels of cardiac myofilaments and expression levels of myofilament-associated protein kinase and phosphatases. Results Slit2 overexpression increased post-IR left ventricular developed pressure (LVDP) by 35% and reduced infarct size by 53%, along with decreased myofibrillar disruption, mitochondrial swelling, and mitochondrial cristae dissolution. Slit2 overexpression significantly changed post-IR gene expression profiles. Functional products of these genes include regulation of cation transmembrane transport, cation homeostasis, collagen fibril organization, and regulation of heart rate. And post-IR myocardial KEGG pathways upregulated by Slit2 overexpression include ECM-receptor interaction, PI3K-Akt signaling pathway, and adrenergic signaling. Slit2 overexpression impacted myofilament phosphorylation together with myofilament-associated protein kinase C (PKC) isoforms and protein phosphatases (PPs). IR in C57BL/6J hearts upregulated phosphorylation of cardiac troponin-I (cTnI), which was suppressed by Slit2 overexpression. Myofilament‐associated PKCε, PKCδ, and PP2A were significantly increased post‐IR in C57BL/6J hearts, but in Slit2‐Tg hearts, myofilament‐associated PKCε and PP2A were increased and PKCδ was suppressed. Conclusions Our results demonstrate that Slit2 overexpression protects cardiac function and reduces IR injury, which is associated with Slit2‐induced gene profile shifts. The suppression of MyBP‐C and troponin‐I phosphorylation, and myofilament‐associated PKCδ levels induced by Slit2 overexpression could contribute to the cardioprotection of Slit2 in post-IR myocardium.
2019-07-04 | GSE133796 | GEO
Project description:Cardiac resident MerTK+ macrophages exert multiple protective roles post-ischemic injury, however, the mechanisms regulating their fate are not fully understood. Here we show that GAS6-inducible transcription factor ATF3 prevents apoptosis of MerTK+ macrophages after ischemia-reperfusion (IR) injury, by repressing the transcription of multiple genes involved in type I interferon expression (Ifih1 and Infb1) and apoptosis (Apaf1). Mice lacking ATF3 in cardiac macrophages or myeloid cells showed excessive loss of MerTK+ cardiac macrophages, poor angiogenesis, and worse heart dysfunction post-IR, which were rescued by the transfer of MerTK+ cardiac macrophages. GAS6 administration improved cardiac repair in an ATF3-dependent manner. Finally, we showed a negative association of GAS6 and ATF3 expression with the risk of major adverse cardiac events in patients with ischemic heart disease. These results indicate that the GAS6-ATF3 axis has a protective role against IR injury by regulating MerTK+ cardiac macrophage survival/proliferation.
2023-11-07 | GSE247139 | GEO
Project description:To develop a new therapeutic strategy for cardiac ischemia/reperfusion injury, we ablated the oxidative activation site of CaMKIIδ in the heart using CRISPR-Cas9 adenine base editing technology. Adult C57Bl6 mice were subjected to control surgery (IR-Sham, 3 biological replicates) or ischemia/reperfusion injury with either no injection (IR, 3 biological replicates), injection of a control virus (IR-Virus control, 3 biological replicates) or injection of a functional CaMKIIδ editing system (IR-Edit, 4 biological replicates). Five weeks after the surgery, hearts were harvested for RNA isolation and subsequent bulk RNA sequencing and gene expression profiling analysis.
2023-02-06 | GSE210494 | GEO