Long Non-Coding RNA SNHG8 Plays a Key Role in Myocardial Infarction Through Affecting Hypoxia-Induced Cardiomyocyte Injury.

BACKGROUND The objective of the study was to explore the role of long non-coding RNA SNHG8 (lncRNA SNHG8) in myocardial infarction (MI) and the related mechanism of action. MATERIAL AND METHODS In vitro model of MI was established by hypoxia induction in cardiomyocyte line H9c2 cells. H9c2 cells were transfected with control-plasmid, SNHG8-plasmid, control-shRNA and SNHG8-shRNA. Quantitative real-time polymerase chain reaction (qRT-PCR) assay was performed to measure transfection efficiency. Creatine kinase-muscle/brain (CK-MB) release, cardiac troponin 1 (cTnI) release and mitochondria viability were detected by using related detection kits. MTT (3-(45)-dimethylthiahiazo (-z-y 1)-35-diphenytetrazoliumromide) assay was used to detect cell viability and flow cytometry analysis was used to detect cell apoptosis. Western blot assay was performed to measure protein expression of cleaved-Caspase3, p-p65 and p65. Enzyme-linked immunosorbent assay (ELISA) and qRT-PCR assay were performed to detect expression of interleukin (IL)-1ß, tumor necrosis factor (TNF)-alpha and IL-6. RESULTS LncRNA SNHG8 was overexpressed in hypoxia-induced cardiomyocytes. SNHG8-plasmid increased lncRNA SNHG8 expression, CK-MB release, cTnI release, and mitochondria viability in hypoxia-induced H9c2 cells. In addition, SNHG8-plasmid reduced cell viability, induced cell apoptosis, and increased expression of cleaved-caspase3, IL-1ß, TNF-alpha, IL-6, and p-p65 in hypoxia-induced H9c2 cells, while the effects of SNHG8-shRNA were opposite. CONCLUSIONS We demonstrated that lncRNA SNHG8 affected myocardial infarction by affecting hypoxia-induced cardiomyocyte injury via regulation of the NF-kappaB pathway.