ABSTRACT
To investigate the effects and mechanisms of total flavones of Epimedium (TFE) on oxidative stress induced by myocardial ischemia/reperfusion injury in rats, forty male SD rats were randomly divided into sham operated group, model group, diltiazem group and flavonoids of Epimedium low and high doses groups with 8 rats in each. Myocardial ischemia/reperfusion injury model was induced by ligaturing the left anterior descending artery for 30 min followed reperfusion for 4 h after TFE was taken by intragastric administration for 4 days. The degree of myocardial infarct was observed by N-BT staining. The concentrations of MDA and activities of SOD and T-AOC in cardiac tissue were measured by colorimetry. Serum TnI concentrations were checked by ELISA. HE stain was used to observe myocardium structure under light microscope. Expressions of SIRT1 and Nrf2 in cardiac tissue were evaluated by immunohistochemistry method and Western blot, respectively. Compared with the model group, the degree of myocardial infarct, MDA concentration in cardiac tissue and the levels of TnI in serum significantly decreased in the diltiazem group and flavonoids of Epimedium low and high doses groups (P<0.05 or P<0.01); flavonoids of Epimedium low and high doses groups and the diltiazem group also showed improvements in myocardium structure under ischemia/reperfusion injury. TFE significantly increased the activity of SOD and T-AOC and the expression of SIRT1 and Nrf2 in cardiac tissue when compared with the model group (P<0.05 or P<0.01). Therefore, TFE can increase anti-peroxidant capacity of myocardium tissue by using intrinsically anti-oxidant signaling pathway of SIRT1 and Nrf2, which can inhibit irreversible damage of cardiomyocytes in myocardial ischemia/reperfusion injury and protect normal function of cardiac tissue.
ABSTRACT
@#ObjectiveTo study the effect and mechanism of vagus nerve stimulation(VNS) on seizure in animal with epilepsy.MethodsSeizures of 34 rats and 8 rabbits were induced by Penicillin, Kainic acid(KA) and Strychnice respectively. Electrocorticographic(ECoG), electrical activition of hippocampal neurons and behaviour were observed to evidence the effects of left intermittent VNS .ResultsVNS could suppress seizures in animal models with epilepsy. There were significant changes in epileptiform ECoG, discharges of hippcampal neuron and behaviour. ConclusionSomatic seizure can be effectively inhibited by visceral afferent inputs through integration in cortical and hippocampal parts.