淫羊藿苷对快速老化小鼠SAMP10学习记忆能力 以及胆碱能系统活性的影响

目的:探讨淫羊藿苷(ICA)对快速老化小鼠SAMP10的学习记忆能力以及胆碱能系统的影响.方法:采取8月龄快速老化小鼠SAMP10为实验对象,随机分为模型SAMP10组,阳性药多奈哌齐组(1 mg· kg-1),ICA低、中、高剂量(50,100,200 mg·kg-1)组,每组12只,以12只同月龄抗快速老化小鼠SAMR1为正常对照.灌胃给药30 d,通过Morris水迷宫、SMG-2迷宫、小鼠跳台仪检测ICA对SAMP10学习记忆能力的影响,通过比色法测定皮层中乙酰胆碱酯酶(AChE)的活力,采用酶联免疫吸附测定法检测乙酰胆碱(ACh)、乙酰胆碱转移酶(ChAT)以及M-胆碱能受体结合力(MCBC)来探讨ICA对SAMP10小鼠胆碱能系统的作用.结果:ICA可以改善SAMP10小鼠的空间探索能力以及定位航行能力,缩短SAMP10小鼠在SMG-2迷宫的潜伏期,提高其在跳台实验中的被动反应能力,增加SAMP10小鼠大脑皮层ACh的含量,提高SAMP10小鼠皮层中MCBC以及ChAT的活性,但对SAMP10小鼠皮层中的AChE活性作用不明显.结论:不同剂量的淫羊藿苷可不同程度的改善SAMP10小鼠的学习记忆能力,其作用机制可能与对胆碱能系统的影响有关.

Effect of icariin on learning and memory abilities and activity of cholinergic system of senescence-accelerated mice SAMP10

Objective: To investigate the effect of icariin(ICA) on learning and memory abilities and cholinergic system in senescence-accelerated mice SAMP10. Method: The 8-month-old senescence-accelerated mice were randomly divided into the model SAMP10 group and the positive Donepezil group (1 mg·kg^-1)and ICA groups (50, 100, 200 mg·kg^-1), with 12 mice in each group. Another 12 8-month-old mice SAMR1 were selected as the normal control group. After 30 days of oral administration, Morris water maze, SMG-2 water maze and experimental platform were used to test the effects of ICA on learning and memory abilities of SAMP10 groups. By colorimetric determination of AChE activity in the cortex, enzyme-linked immunosorbent assay detection of ACh, ChAT, MCBC of the cerebral cortex, the effect of ICA on the cholinergic system of SAMP10 was observed. Result: ICA could improve the abilities of space exploration and positioning navigation of SAMP10, shorten the latency in SMG-2 water maze, enhance their jumping ability in response to the passive test, and increase levels of ACh, ChAT, MCBC in the cerebral cortex of SAMP10. But its active effect on AChE in SAMP10 cortex was not obvious. Conclusion: Different doses of icariin can improve learning and memory abilities of SAMP10 to varying degrees, which may be related to its effect on the cholinergic system.