AIM:To determine the effects of different-term streptozotocin(STZ)-induced diabetes on ischemia/reperfusion(I/R)injury and cell apoptosis in rats myocardial via alterations in myocardial peroxynitrite.METHODS:The models of I/R injury were induced by occlusion and reperfusion of the left descending coronary artery(LDCA)in rats.I/R-induced infarct size was determined using triphenyltetrazolium chloride(TTC)staining.Quantified caspase-3 expression was used to represent apoptosis by Western blotting analysis.Peroxynitrite formation as indicated by nitrotyrosine level was measured by morphometric analysis.RESULTS:Two weeks after STZ treatment,infarct size(35.00%?3.00%)was smaller in 2 weeks diabetic hearts(2WKD)as compared with time-matched control group(2WKC)(51.00%?3.30%),whereas after 16 weeks of diabetes(16WKD),the infarct size(61.00%?3.00%)was bigger in the diabetic hearts as compared with the 16WKC group(50.00%?2.00%,P

AIM: To quest the relationship bwteen BDNF and seizures. METHODS: BDNF and other correlative proteins in the hippocampus of audioepileptic rat (P77PMC) have been detected by immunohistochemistry at different stages of seizures including quiet stage, preconvulsive stage, convulsive stage and postconvulsive stage. Wistar rats were served as controls. RESULTS: At quiet stage, the BDNF in the hippocampus of P77PMC were less than that of control group and stepped up after stimulation, trkB in the hippocampus of P77PMC were high at every stages, but PY20 were increased only after stimulation. NPY in the hippocampus of P77PMC were in a low level before seizures. CONCLUSION: The endogenetic BDNF may alter the excitement of P77PMC by adjusting the expression of NPY in hippocampus and activating its receptor trkB.