Medicine RSS-Feeds by Alexandros G. Sfakianakis,Anapafseos 5 Agios Nikolaos 72100 Crete Greece,00302841026182,00306932607174,alsfakia@gmail.com
Πληροφορίες
Πέμπτη 15 Οκτωβρίου 2020
Down–regulating miR-217-5p Protects Cardiomyocytes against Ischemia/Reperfusion Injury by Restoring Mitochondrial Function via Targeting SIRT1
Down–regulating miR-217-5p Protects Cardiomyocytes against Ischemia/Reperfusion Injury by Restoring Mitochondrial Function via Targeting SIRT1:
Downregulating miR-217-5p could protect cardiomyocytes against ischemia/reperfusion (I/R) injury, but its role in restoring mitochondrial function of I/R-injured cardiomyocytes remained unclear. H9C2 cardiomyocyte-derived cell line with I/R injury was established in vitro on the basis of hypoxia/reperfusion (H/R) model. Cell viability and apoptosis were respectively detected by MTT assay and flow cytometry. Contents of lactate dehydrogenase (LDH) and adenosine triphosphate (ATP) were determined. Flow cytometry was performed to measure the production of reactive oxygen species (ROS) and mitochondrial membrane potential (MMP). Target gene and potential binding sites between miR-217-5p and Sirtuin1 (SIRT1) were predicted by TargetScan and confirmed by dual-luciferase reporter assay. Relative SIRT1 and expressions of autophagy-related and apoptosis-related genes were measured by quantitative real-time polymerase chain reaction (qRT-PCR) and Western blot. After I/R treatment, the viability of H9C2 cardiomyocyte-derived cell line and ATP contents were reduced, but LDH and ROS contents were increased, at the same time, cell apoptosis and the expressions of miR-217-5p, p62 and cleaved caspase-3 were increased, whereas the expressions of SIRT1, LC3 (light chain 3), PINK1 (PTEN-induced kinase 1), Parkin, Bcl-2, and c-IAP (inhibitor of apoptosis protein) were reduced. However, downregulating miR-217-5p expression reversed the effects of I/R. SIRT1 was predicted and verified to be the target of miR-217-5p, and silencing SIRT1 reversed the effects of downregulating miR-217-5p on I/R-injured cells. Downregulating miR-217-5p could help restore mitochondrial function via targeting SIRT1, so as to protect cardiomyocytes against I/R-induced injury.
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