异甘草素对脑缺血再灌注小鼠认知功能障碍及能量代谢的影响

Effects of isoliquiritigenin on cognition dysfunction and brain energy metabolism following repeated cerebral ischemia-reperfusion in mice

目的 研究异甘草素 (ISL)对脑缺血再灌注小鼠认知功能障碍及能量代谢的影响。方法 采用双侧颈总动脉反复夹闭再灌注造成小鼠学习记忆功能障碍模型。采用跳台实验和Y型迷宫实验测试小鼠学习记忆能力,采用反相高效液相色谱法检测脑组织ATP含量、腺苷酸池 (TAN)水平和能量负荷值(EC)。结果 ISL(10、20、40mg·kg-1 )延长跳台实验中潜伏期,减少错误次数;减少Y型迷宫实验中累计电击次数,增加正确反应次数;剂量依赖性提高脑组织中ATP含量、TAN水平和EC值。结论 ISL能改善反复脑缺血再灌注小鼠认知功能障碍,其作用机制可能与改善脑能量代谢有关。

Aim To investigate the effects of isoliquiritigenin(ISL) on cognition dysfunction and brain energy metabolism following repeated cerebral ischemia-reperfusion in mice.Methods Mouse models of learning and memory deficits were made by repeated occlusion of bilateral common carotid arteries and reperfusion. Step-down test and Y-maze task were used to examine the learning and memory abilities of mice. The brain energy state was analyzed by reversed-phase high performance liquid chromatogra phy. Results ISL 10, 20 and 40 mg·kg -1 ig reduced the n umber of errors and extended the latency of memory in step-down test, decreased the number of cumulated stimulation and increased the number of right choices i n Y-maze task. ISL(10, 20, 40 mg·kg -1) increased the levels of ATP, ener gy charge (EC) and total adenine nucleotides(TAN) in a dose-dependent manner. Conclusion The results suggest that ISL improves cognition dysfun ction induced by repeated cerebral ischemia-reperfusion in mice, which may be r elated to the improvement of brain energy metabolism.