Background: Ischemic stroke, also known as cerebrovascular accident or cerebral stroke, occupies the first place in the world's top 10 causes of death, with high incidence, mortality and disability rates.
Objectives: To investigate the effect of stilbene glycoside upregulated SIRT3/AMPK expression on neuronal mitochondrial autophagy and neuronal apoptosis in ischemic stroke.
Material and methods: The PC12 cells were cultured without serum to construct an ischemic neuron model. The cells were divided into 6 groups: normal group (untreated cells), model group (ischemic treated cells), TSG group (stilbene glycoside treatment), NC group (SIRT3 and AMPK negative control treatment), si-SIRT3 group (SIRT3 silencing treatment), TSG+si-SIRT3 group (joint treatment), and TSG+si-SIRT3+oe-AMPK group (joint treatment). Cell survival and the expression of related molecules were detected.
Results: Compared with normal group, the model group had significantly decreased cell survival rate, mitochondrial membrane potential, as well as the expression of Bcl-2, LC3II/I, P62, PINK1, Parkin, SIRT3, AMPK, and p-AMPK, while showing significantly increased proportion of apoptosis and the expression of caspase 3 and Bax. Compared with the model group, TSG treatment promoted cell survival rate and mitochondrial autophagy, and inhibited apoptosis, while SIRT3 silencing treatment reduced cell survival rate and mitochondrial autophagy, and increased apoptosis. The SIRT3 silencing could block the inhibitory effect of TSG on the apoptosis of ischemic PC12 cells and promote mitochondrial autophagy, and AMPK overexpression could save the apoptosis of ischemic PC12 cells caused by SIRT3 silencing, and promote mitochondrial autophagy.
Conclusions: By promoting the expression of SIRT3/AMPK, TSG promotes mitochondrial autophagy in ischemic neurons and inhibits their apoptosis.
Keywords: PC12 cells; apoptosis; ischemic; mitochondrial; sirtuin 3.