Cardioprotective microRNAs (protectomiRs) in a pig model of acute myocardial infarction and cardioprotection by ischaemic conditioning: MiR-450a

• Published in: British journal of pharmacology
• Main Authors: Nagy, Regina N, Makkos, András, Baranyai, Tamás, Giricz, Zoltán, Szabó, Márta, Kravcsenko-Kiss, Bernadett, Bereczki, Zoltán, Ágg, Bence, Puskás, László G, Faragó, Nóra, Schulz, Rainer, Gyöngyösi, Mariann, Lukovic, Dominika, Varga, Zoltán V, Görbe, Anikó, Ferdinandy, Péter
• Format: Journal Article
• Language: English
• Published: England 18.09.2024
• Subjects: postconditioning; protectomiR; miR‐450a; microRNA; miR‐451; remote conditioning; pig; preconditioning
• DOI: 10.1111/bph.17313

Cardioprotective miRNAs (protectomiRs) are promising therapeutic tools. Here, we aimed to identify protectomiRs in a translational porcine model of acute myocardial infarction (AMI) and to validate their cardiocytoprotective effect. ProtectomiR candidates were selected after systematic analysis of miRNA expression changes in cardiac tissue samples from a closed-chest AMI model in pigs subjected to sham operation, AMI and ischaemic preconditioning, postconditioning or remote preconditioning, respectively. Cross-species orthologue protectomiR candidates were validated in simulated ischaemia-reperfusion injury (sI/R) model of isolated rat ocardiomyocytes and in human AC16 cells as well. For miR-450a, we performed target prediction and analysed the potential mechanisms of action by GO enrichment and KEGG pathway analysis. Out of the 220 detected miRNAs, four were up-regulated and 10 were down-regulated due to all three conditionings versus AMI. MiR-450a and miR-451 mimics at 25 nM were protective in rat cardiomyocytes, and miR-450a showed protection in human cardiomyocytes as well. MiR-450a has 3987 predicted mRNA targets in pigs, 4279 in rats and 8328 in humans. Of these, 607 genes are expressed in all three species. A total of 421 common enriched GO terms were identified in all three species, whereas KEGG pathway analysis revealed 13 common pathways. This is the first demonstration that miR-450a is associated with cardioprotection by ischaemic conditioning in a clinically relevant porcine model and shows cardiocytoprotective effect in human cardiomyocytes, making it a promising drug candidate. The mechanism of action of miR-450a involves multiple cardioprotective pathways.