复圣散对高脂大鼠脑缺血再灌后脑内NPY含量及其mRNA表达的影响

目的:探讨脑缺血后内源性缩血管活性肽神经肽Y(NPY)的变化规律以及中药复圣散对其影响。方法:通过高脂饮食喂养复制食饵性高脂血症大鼠,在此基础上采用反复脑缺血再灌流手术造成大鼠脑损伤模型,以放免法测定高脂大鼠脑缺血再灌注后脑内NPY含量的动态变化,并运用原位杂交技术观察模型组大鼠脑组织NPYmRNA表达模式。结果:脑缺血再灌后1d模型组大鼠脑内NPY含量比正常对照组高51.86%(P＜0.05),并持续至术后7d,且NPYmRNA表达上调,而复圣散预防和治疗性给药组大鼠脑内NPY含量明显少于同期模型组(P＜0.05);同时,复圣散预防和治疗组大鼠脑内NPYmRNA表达下调。结论:提示脑缺血性损伤与脑内NPY释放失衡密切相关,而中药复圣散对脑内神经肽Y含量有一定的调节作用,推测这可能是该方防治脑血管病的主要作用机制之一。

Effect of Fu-Sheng powder on NPY and its mRNA in brain of rats with hyperlipidemia after cerebral ischemia and reperfusion

AIM: To observe the changes in neuropeptide Y(NPY) and the effect of Fu-Sheng powder(FSP) on NPY in the rat brain in a steady cerebral ischemia and reperfusion(I/R) model. METHODS: The models of rat brain injury were established by repeated cerebral I/R in rats with hyperlipidemia. Radioimmunoassay was performed to determine the level of NPY, while NPY mRNA expression was observed by in situ hybridization. RESULTS: After 1 day of I/R, compared with control group, the content of NPY in the model animals were significantly increased by 51.86% ( P< 0 01) and lasting 7 days after I/R, and the expression of NPY mRNA was greatly increased. FSP treatment decreased the contents of NPY ( P< 0 05, P< 0 01) and its mRNA expression. CONCLUTION: There were obvious imbalances of NPY in the rat brain after cerebral I/R and the FSP might antagonize ischemia injury of brain through modulating NPY, which may be one of the mechanisms underlying FSP treatment for cerebral vascular diseases.