Abstract

Objective To explore the regulatory role of the lncRNA PAX8-AS1/miR-145-5p axis in the mitigation of hypoxia-induced damage to oxygenated (HR) myocardial cells by sevoflurane (Sev). Methods A hypoxic-reoxygenation (HR) in vitro model was established by subjecting cells to 4 h of hypoxia followed by 24 h of aeration. An in vivo MI/RI model was established via ischemia-reperfusion. Gene expression was detected using RT-qPCR. Cell proliferation and apoptosis was assessed using CCK8 and flow cytometry. Expression of myocardial injury markers, inflammatory factors, and oxidative stress markers was measured via ELISA. The targeted relationship between genes was validated using dual luciferase reporter assays and RNA immunoprecipitation. Results Sev can resist the upregulation of PAX8-AS1 and downregulation of miR-145-5p in HR cardiomyocytes or MI/RI myocardial tissue. PAX8-AS1 overexpression attenuates Sev-induced suppression of cardiomyocyte proliferation and apoptosis inhibition following injury Sev pre-treatment reduced the expression of myocardial cell damage markers, inflammatory factors, and oxidative stress markers, but these markers increased after PAX8-AS1 overexpression and decreased after miR-145-5p analogue transfection. Conclusion Sev can alleviate HR-induced myocardial cell injury by inhibiting PAX8-AS1 and promoting miR-145-5p expression.