Background: Ischemia heart disease is one of the major causes of death worldwide which often associated with tissue infarction and limit the recovery of function. Multiple factors involved in the I/R-induced cardiomyocyte dysfunction which were consistent with a role of oxidative stress and altered endothelium-dependent responses. However, the pathogenic mechanisms in I/R injury remain unclear.
Materials and methods: The H9C2 cells were in the ischaemia/reperfusion (I/R) condition. After I/R, the cells were transfected with or without adenovirus-urothelial carcinoma associated 1(Ad-UCA1). Then qRT-PCR analysis was performed to quantify mRNA expression of different treatment groups. Cell apoptosis rate was assessed using flow cytometry and ER stress biomarker expression were measured by immunoblotting. Intracellular and mitochondrial ROS generation were assayed by fluorescence microscope after staining with the DCFDA or MitoSOX.
Results: I/R conditions trigger lncRNAs UCA1 expression, cellular and mitochondria ROS production, resulting in cell apoptosis through the induction of oxidative and ER stress. Overexpression of UCA1 protects H9C2 cells from I/R-induced ER stress and cell apoptosis. Moreover, UCA1 might be a potential regulator in the protective effect of I/R‑induced oxidative stress and mitochondria dysfunction. Subsequently, ER stress inhibitor attenuated the effect of siUCA1 induced injury in H9C2 cells.
Conclusion: The expression of UCA1 against I/R induced oxidative stress and mitochondria dysfunction via suppression of endoplasmic reticulum stress. UCA1 might be a biomarker to improved diagnosis of I/R injury.
Keywords: ER stress; Ischaemia/reperfusion; LncRNAs UCA1; Mitochondria dysfunction; Oxidative stress.