synapsinⅠ参与(-)黄皮酰胺增强齿状回突触传递功能

目的观察synapsinⅠ在(-)黄皮酰胺促进大鼠海马齿状回突触传递功能中的作用。方法用电生理方法观察(-)黄皮酰胺对基础突触传递功能的影响;采用Westernblot方法及共聚焦显微镜检测了(-)黄皮酰胺对synapsinⅠ磷酸化的时间、浓度依赖关系,以及确定促进synapsinⅠ激活的上游蛋白激酶。结果在整体动物中,(-)黄皮酰胺可明显增加海马齿状回群峰电位,并且脑室给药5 min即可促进海马synapsinⅠ磷酸化增强,15 min时皮层synapsinⅠ磷酸化增强最明显。0.1、1、10μmol.L-1(-)黄皮酰胺可浓度依赖性促进PC12细胞中synapsinⅠ激活,且10μmol.L-1(-)黄皮酰胺在1~2 min均可激活突触体和PC12细胞中synapsinⅠ。PKA抑制剂H89可抑制(-)黄皮酰胺对synapsinⅠ的磷酸化。结论(-)黄皮酰胺通过PKA促进synapsinⅠ磷酸化而增强基础突触传递活动。

Effect of (-)clausenamide on potentiating synaptic transmission in dentate gyrus: Role of synapsin Ⅰ

Aim To study the effect of synapsinⅠon synaptic transmission in rat dentate gyrus induced by(-) clausenamide.Methods The basal synaptic transmission experiment was conducted through electrophysiological recordings.The effect of(-) clausenamide on synapsinⅠ phosphorylation was measured by western blot and confocal microscopy.Results(-)Clausenamide increased the population spike(PS) of hippocampal dentate gyrus.The phosphorylation of synapsinⅠ was increased both in cortex and hippocampus,the maximum effect was observed at 5 min in hippocampus and at 15 min in cortex.Furthermore,(-)clausenamide promoted the phosphorylation of synapsinⅠat a dose-denpendent manner in PC12 cells.The phosphorylation of synapsinⅠ in PC12 cells and synaptosomes incubated with(-)clausenamide was increased and reached maximum at 1~2 min.However,H89,PKA inhibitor,blocked the effect of(-)clausenamide on synapsinⅠ phosphorylation.Conclusion(-)Clausenamide activated synapsinⅠ via PKA signal pathway,which may contribute to the effect of(-)clausenamide on potentiating basal synaptic transmission.