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Molecular Network Approach Reveals <i>Rictor</i> as a Central Target of Cardiac ProtectomiRs
oleh: András Makkos, Bence Ágg, Zoltán V. Varga, Zoltán Giricz, Mariann Gyöngyösi, Dominika Lukovic, Rainer Schulz, Monika Barteková, Anikó Görbe, Péter Ferdinandy
Format: | Article |
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Diterbitkan: | MDPI AG 2021-09-01 |
Deskripsi
Cardioprotective medications are still unmet clinical needs. We have previously identified several cardioprotective microRNAs (termed ProtectomiRs), the mRNA targets of which may reveal new drug targets for cardioprotection. Here we aimed to identify key molecular targets of ProtectomiRs and confirm their association with cardioprotection in a translational pig model of acute myocardial infarction (AMI). By using a network theoretical approach, we identified 882 potential target genes of 18 previously identified protectomiRs. The <i>Rictor</i> gene was the most central and it was ranked first in the protectomiR-target mRNA molecular network with the highest node degree of 5. Therefore, <i>Rictor</i> and its targeting microRNAs were further validated in heart samples obtained from a translational pig model of AMI and cardioprotection induced by pre- or postconditioning. Three out of five <i>Rictor</i>-targeting pig homologue of rat ProtectomiRs showed significant upregulation in postconditioned but not in preconditioned pig hearts. <i>Rictor</i> was downregulated at the mRNA and protein level in ischemic postconditioning but not in ischemic preconditioning. This is the first demonstration that <i>Rictor</i> is the central molecular target of ProtectomiRs and that decreased <i>Rictor</i> expression may regulate ischemic postconditioning-, but not preconditioning-induced acute cardioprotection. We conclude that <i>Rictor</i> is a potential novel drug target for acute cardioprotection.