牛磺酸锌对血管性痴呆小鼠学习和记忆能力的影响

目的:研究牛磺酸锌(taurine-zinc,TZC)对血管性痴呆(vascular dementia,VD)小鼠学习和记忆能力的影响及其相关机制。方法:将小鼠随机分为模型组、假手术组及TZC 50 mg/kg组、100 mg/kg和200 mg/kg给药组。给药组每天按10 m L/kg灌胃,假手术组和模型组给予等体积蒸馏水,灌胃14 d后,利用双侧颈总动脉阻断合并尾静脉放血法制备小鼠VD模型。ELISA检测脑组织中肿瘤坏死因子α(TNF-α)和白细胞介素1β(IL-1β)的水平;分光光度计法检测脑组织诱导型一氧化氮合酶(i NOS)活性和一氧化氮(NO)含量的变化;利用跳台和水迷宫实验观察小鼠的学习和记忆能力。结果:TZC 50 mg/kg、100 mg/kg和200 mg/kg组小鼠脑组织中TNF-α、IL-1β、i NOS和NO水平均降低。在水迷宫实验中,与模型组相比,TZC 100 mg/kg和200 mg/kg组的潜伏期缩短,TZC 50mg/kg、100 mg/kg和200 mg/kg组的错误次数减少;在跳台实验中,TZC 50 mg/kg、100 mg/kg和200 mg/kg组较模型组潜伏期延长,错误次数减少(P0.05)。结论:TZC对VD小鼠的学习和记忆能力有改善作用,其机制可能与降低脑组织TNF-α、IL-1β、i NOS和NO水平有关。

Effects of taurine-zinc on learning and memory abilities of vascular dementia mice

AIM:To observe the effects of taurine-zinc (TZC) on the learning and memory abilities of vascular dementia (VD) mice and to investigate the related mechanism. METHODS:The mice were randomly divided into model group, sham group, and TZC at 50 mg/kg, 100 mg/kg and 200 mg/kg groups. The mice in drug groups were given TZC by gavage at 10 mL/kg once daily. The mice in sham group and model group were given equal volume of distilled water. VD mice were established by intercepting both common carotid arteries and bleeding at caudal vein after 14 d of gavage. The levels of tumor necrosis factor-α (TNF-α) and interleukin-1β (IL-1β) were detected by ELISA. The levels of inducible nitric oxide synthase (iNOS) and nitric oxide (NO) were measured via spectrophotometer. Step-down test and Morris water maze test were used to examine the abilities of learning and memory in the mice. RESULTS:TZC at 50 mg/kg, 100 mg/kg and 200 mg/kg reduced the levels of TNF-α, IL-1β, iNOS and NO in the brain tissues. In the water maze test, TZC at 100 mg/kg and 200 mg/kg significantly decreased the error times and latency compared with model group. In the step-down test, the escape latency was prolonged and error times were lowered significantly by treatment with TZC at 50 mg/kg, 100 mg/kg and 200 mg/kg as compared with model group. CONCLUSION:TZC improves the abilities of learning and memory, which might be related to the reduction of TNF-α, IL-1β, iNOS and NO levels in VD mice.