Background: Acute hypoxia and reoxygenation injury, as a common environmental stress condition, is a basic condition of most pathophysiological processes. It has been approve that autophagy and oxidant stress could contribute to acute hypoxia and reoxygenation injury. This study is aimed to examine the effect of glyceraldehyde-3-phosphate dehydrogenase (GAPDH) silence on cell injury with acute hypoxia and reoxygenation injury by autophagy and antioxidant stress pathway.
Methods: GAPDH expression was silenced by siRNA in H9C2 cardiomyoblasts with acute hypoxia and reoxygenation injury. Autophagy was detected by western blot for autophagy proteins and monodansylcadaverine (MDC) staining for acidic substances. Pro-apoptosis protein and flow cytometry were used to assess cell apoptosis and death and intracellular adenosine triphosphate (ATP) relative concentration was measured. Oxidant stress was assessed by measuring 2'-7'-dichlorodihydrofluorescein diacetate (DCFH-DA), thiobarbituric acid reactive substances (TBARS), glutathione (GSH) and super oxide dismutase (SOD).
Results: In this study, GAPDH-silence enhanced autophagy in H9C2 cells with acute hypoxia and reoxygenation injury, decreased oxidant stress and increased antioxidant pathways; and reduced cell apoptosis and death. However, GAPDH-silence had no significant effect on cell energy.
Conclusion: GAPDH pre-silence by siRNA reduces H9C2 cell death occurring via autophagy and anti-oxidative stress pathway in acute hypoxia and reoxygenation injury. This study enriches the understanding of GAPDH pathophysiology role, and provides potential new therapeutic targets for cardiac disease states characterized by oxidative stress.
Keywords: Autophagy; GAPDH; Oxidative stress.
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