Myocardial injury is an indicator of poor prognosis in sepsis, whereas propofol has been reported to protect the myocardium. Therefore, the present study investigated the effect of propofol on myocardial injury in sepsis and its mechanism. An in vitro model of myocardial cell injury was established in myocardial H9C2 cells using lipopolysaccharide (LPS). The Cell Counting Kit 8 (CCK8) assay was used to investigate the effect of propofol pretreatment on the viability of normal and LPS-challenged H9C2 cells, whereas the lactate dehydrogenase (LDH) detection kit was used to measure the levels of LDH. The expression levels of LC3 were analyzed using an immunofluorescence assay. Western blotting was performed to analyze the expression levels of autophagy-related proteins. Following treatment with the autophagy inhibitor 3-methyladenine, CCK8 assay, TUNEL assay, western blotting, 2,7-dichlorohydrofluorescein diacetate assay and ELISA were performed to investigate whether propofol exerted its effects on cell viability, apoptosis, oxidative stress and inflammation via autophagy. Moreover, to further explore the regulatory mechanism of propofol in myocardial injury, sirtuin 1 (SIRT1) was knocked down via transfection with small interfering RNA, and SIRT1 protein was inhibited via the addition of the SIRT1 inhibitor EX527. The present study demonstrated that propofol activated autophagy in LPS-induced cardiomyocytes, and reversed the effects of LPS on viability, apoptosis, oxidative stress and the inflammatory response. Moreover, SIRT1 knockdown and inhibition decreased the activation of autophagy and the protective effect of propofol on LPS-induced cardiomyocytes. In conclusion, propofol reduced LPS-induced cardiomyocyte injury by activating SIRT1-mediated autophagy.
Keywords: autophagy; cardiomyocyte injury; propofol; sepsis; sirtuin 1.
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