Resveratrol Inhibited Nanoparticles Stromal Interaction Molecule 2 in Regulating miR-20b-5p Signaling Pathway to Improve Mitochondrial Function During Myocardial Ischemia-Reperfusion Injury

Myocardial ischemia-reperfusion (IR) in diabetes can cause severe myocardial damages. In this study, resveratrol (RES) nanoparticles were used in diabetic myocardial IR rat model injury to assess its effect on mitochondria function. Rat models were assigned into sham group, IR group, IR+ RES group, IR+ RES+ mir-NC group, and IR+ RES+ miR-20b-5p inhibitor group. Myocardial infarction area was measured by TTC in 5 rats from each group, and ultrasound was used to detect left ventricular end-systolic internal diameters (LVIDs) and end-diastolic internal diameters (LVIDd), along with analysis of cardiomyopathy by HE staining. miR-20b-5p and Stromal interaction molecule 2 (STIM2) expressions, cardiomyocyte proliferation, apoptosis, cell viability, mitochondrial function, and relationship between miR-20b-5p and STIM2 were also analyzed. Resveratrol (RES) nanoparticles were prepared successfully. Myocardial infarct size, LVIDd and LVIDs of rats in IR+ RES group decreased (vs. IR group), but were higher than sham group. miR-20b-5p expression also increased in the IR+ RES group (vs. IR group), and the above indicators were decreased by the miR-20b-5p inhibitor (vs. IR+ RES group, P < 0.05). The myocardial changes in rats from the IR+ RES+ miR-20b-5p antagomir group were smaller (vs. IR group), while STIM2 expression was lower than in the IR group after using the RES nanoparticles (P < 0.05). RES nanoparticles can thus enhance mitochondrial function and cell viability of cardiomyocytes, increasing cell proliferation rate and decreasing apoptosis rate (vs. IR group, P < 0.05). After using the RES nanoparticles to interfere with myocardial IR in the diabetic rats, they were found to inhibit STIM2 and improve mitochondria by regulating miR-20b-5p signaling pathway.