糖尿病认知功能障碍大鼠模型的建立及其认知功能障碍观察

目的：探讨糖尿病伴认知功能障碍大鼠模型的建立方法,并观察随着病程发展,糖尿病大鼠认知功能的变化。方法通过对SD大鼠腹腔注射高剂量链脲佐菌素（STZ）建立糖尿病大鼠模型,成模后在正常条件下饲养,采用Morris水迷宫观察第6、9、12周糖尿病大鼠的认知功能,光学显微镜和透射电子显微镜观察糖尿病大鼠海马神经元的形态学变化,了解糖尿病大鼠认知功能障碍形成的时间,确定认知功能障碍大鼠模型的建立方法。结果大鼠从发病后第6～12周,其认知功能障碍的程度随着糖尿病病程的延长呈进行性加重,海马神经元超微结构发生了明显改变,细胞器数量减少、细胞核深染,细胞开始凋亡;发病后第12周,海马组织切片 H E染色后光镜观察,可见其海马神经元数量明显减少,形态异常。结论随着糖尿病病程的延长,糖尿病大鼠可出现明显的认知功能障碍,至发病第12周,其大脑海马神经元在形态学上发生了明显变化,并出现了相应的行为学改变,因此可以将该时间段作为糖尿病并发认知功能障碍大鼠模型建立成功的时间。     

Curcuma increasing antitumor effect of Rhizoma paridis saponins through absorptive enhancement of paridis saponins

Rhizoma paridis saponins (RPS) played a good antitumor role in many clinical applications. However, low oral bioavailability limited its application. In this research, water extract of Curcuma (CW) significantly increased antitumor effect of Rhizoma paridis saponins (RPS). GC–MS was used to identify its polar composition. HPLC was applied for determination of the content of curcuminoids in CW. As a result, 47 analytes with 0.65% of curcuminoids were identified in CW. According to the in vivo anti-tumor data, the best proportion of curcuminoids in CW with RPS was 16:500 (w/w). Using this ratio, curcuminoids significantly increased absorption of RPS in the everted rat duodenum sac system. In addition, curcuminoids decreased the promotion of RPS on rhodamine 123 efflux. The effect of curcuminoids was similar to that of the P-gp inhibitor, cyclosporin A in combination with RPS. In conclusion, drug combination of water extract of Curcuma with RPS was a good method to increase the antitumor effect of RPS. This combination would be a potent anticancer agent used in the prospective application.