多塞平对大鼠局灶性脑缺血再灌注损伤的保护作用

目的　观察多塞平对急性脑缺血再灌注损伤大鼠的保护作用。方法　大鼠 1 2 0只 ,随机分为缺血再灌注组 ,多塞平大、中、小剂量组 ,尼莫地平阳性对照组和假手术组。以线栓法阻断大脑中动脉制作大鼠急性脑缺血再灌注模型 ,分别测定皮层脑组织一氧化氮 (NO)含量、一氧化氮合酶活性(NOS)、超氧歧化酶 (SOD)活性、丙二醛 (MDA)含量及大脑皮层神经元细胞内游离钙 (Ca2 + ] i)水平。结果　与空白对照组比较 ,多塞平 2 5、5、7 5mg·kg- 1 和尼莫地平阳性对照组可降低NO含量、NOS活性、MDA含量及皮层神经元细胞内 Ca2 + ] i 含量、升高SOD活性 (P <0 0 5或P <0 0 0 1 )。结论　多塞平对大鼠局灶性脑缺血再灌注损伤具有保护作用。

Protective effects of doxepin on focal cerebral ischemia-reperfusion injured rats

AIM To observe protective effects of doxepin on focal cerebral ischemia-reperfusion(I-R)injured rats. METHODS 120 rats were randomly divided into ischemia-reperfusion group,doxepin, nimodipine group and sham-operated group respectively, ischemia-reperfusion model was made by using the suture emboli method, the content of NO and MDA, activities of NOS and SOD in the cerebral tissues and the intracellular Ca 2+ ] i in the cerebral cortex were determined respectively. RESULTS The content of NO, MDA and Ca 2+ ] i and the activities of NOS decreased and the activities of SOD increased significantly in the doxepin and nimodipine group compared with ischemia-reperfusion group respectively(P<0 05 or P<0 01). CONCLUSION The protective effects of doxepin on the focal ischemia-reperfusion injured rats were related to calcium antagonist action.