阿米三嗪-萝巴新对慢性间断性缺氧大鼠学习记忆能力的改善及相关生化机制的探讨

目的　探讨阿米三嗪 萝巴新 (almitrine raubasine)对慢性间断性缺氧 (chronicepisodichypoxia ,EHYP)大鼠学习记忆能力和脑内胆碱乙酰转移酶 (cholineacetyltransferase ,ChAT)活性的影响 ,为寻找改善阻塞性睡眠呼吸暂停 (OSAS)患者学习记忆障碍的方法提供实验依据。方法　建立EHYP大鼠模型 (EHYP组 ,9只 ) ,并给予阿米三嗪 萝巴新 (0 0 3片 / 2 5 0 g体重 ,每天 2次 )干预(治疗组 ,9只 ) ,并设不行缺氧处理大鼠为对照组 (7只 )。用被动避暗回避反射试验评价大鼠学习记忆能力 ,潜伏期 (STL)越长 ,学习记忆能力越强 ;用放射化学法测定大鼠皮层、海马和纹状体ChAT活性。结果　与对照组相比 ,EHYP组大鼠STL明显短于对照组和治疗组 (P <0 0 1) ,各脑区ChAT活性明显低于对照组和治疗组 (均P <0 0 1)。结论　阿米三嗪 萝巴新可改善EHYP大鼠学习记忆能力并提高其脑内ChAT活性。

Effects of almitrine-raubasine on learning-memory ability in chronic episodic hypoxia rat and possible biochemical mechanism involved

Objective To investigate the effects of almitrine-raubasine on learning-memory ability and brain choline acetyltransferase (ChAT) activity in chronic episodic hypoxia (EHYP) rat. Methods After establishing the rat model of EHYP, almitrine-raubasine (0.03 tablets/250 g body weight , Bid) was given to the EHYP rats. The learning-memory ability was evaluated by using passive avoidance test and the ChAT activity in three different brain regions (including cerebral cortex, hippocampus and striatum) was determined using radiochemical method. Results As compared with the controlled rats, the performance on passive avoidance test of EHYP rats was impaired significantly (P<0.01) and their ChAT activities in all different brain regions were decreased significantly (P<0.05). And as compared with EHYP rats, the rats in treatment group showed better performance on passive avoidance test (P<0.01) and higher ChAT activity in all different brain regions (P<0.05). Conclusion Almitrine-raubasine might improve the learning-memory ability and increase the brain ChAT activity in EHYP rats.