南方医科大学学报 ›› 2016, Vol. 36 ›› Issue (10): 1345-.

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胰高血糖素样多肽-1改善2型糖尿病大鼠的学习和记忆能力

谭照光,高维鸿,蔡祥胜,王方,惠宏襄   

  • 出版日期:2016-10-20 发布日期:2016-10-20

Glucagon-like peptide 1 improves learning and memory abilities of rats with type 2 diabetes

  • Online:2016-10-20 Published:2016-10-20

摘要: 目的观察糖尿病治疗药物胰高血糖素样肽-1(GLP-1)对糖尿病大鼠学习与记忆功能障碍的改善作用。方法雄性SD大 鼠随机分为正常组(Normal),糖尿病模型组组(DM)和GLP-1治疗组(GLP-1)。采用高脂高糖喂养合并链脲佐菌素(STZ)诱导 建立2型糖尿病模型。将糖尿病大鼠模型随机分为糖尿病组和GLP-1组,糖尿病组大鼠不进行治疗,GLP-1组大鼠于糖尿病成 型后第25天,以经皮下埋缓释泵方式给予GLP-1(30 pmol/kg/min)治疗7 d。治疗结束后先使用Morris水迷宫实验评估各组大 鼠的学习及认知能力,然后或获取大鼠大脑海马区组织,用实时定量PCR(Real-time PCR)检测认知相关基因的转录,蛋白印迹 法(Western blotting)检测认知相关蛋白的表达,免疫组化检测认知相关蛋白的表达和细胞定位。结果Morris水迷宫实验显示 糖尿病组大鼠的学习和记忆功能显著下降(P<0.05),荧光定量PCR结果发现糖尿病大鼠脑内APP,BACE1,Arc,ERK1/2,PKA, PKC的基因转录升高(P<0.05),Western Blotting和免疫组化结果显示Arc蛋白分子在糖尿病大鼠中表达升高。而GLP-1处理 组大鼠的学习和记忆功能比糖尿病组有显著改善(P<0.05),脑内APP,BACE1,Arc,ERK1/2,PKA,PKC基因转录表达明显减少 (P<0.05),Arc表达降低。结论GLP-1治疗能够显著改善2型糖尿病大鼠的学习与记忆功能障碍,其效果可能是通过调控细胞 的PKC,PKA,ERK1/2通路,抑制Arc的表达而实现的。

Abstract: Objective To investigate the effect of glucagon-like peptide 1 (GLP-1) on cognitive dysfunction in diabetic rats. Methods Male SD rats were randomly divided into normal control group, diabetes mellitus (DM) group, and GLP-1 treatment group. Rat models of type 2 diabetes were established by high-sugar and high-fat feeding and streptozotocin (STZ) injection, and 25 days after the onset of diabetes, GLP-1 was infused in GLP-1 treatment group at the rate of 30 pmol·kg-1 ·min-1 via a subcutaneous osmotic pump for 7 days. The learning and cognitive ability of the rats was assessed with Morris water maze test, and the expression of cognition-related genes in the hippocampus tissue was detected with real-time PCR, Western blotting and immunohistochemical staining. Results Compared with the normal control group, the diabetic rats showed significantly decreased learning and memory abilities (P<0.05) with increased hippocampal expressions of APP, BACE1, Arc, ERK1/2, PKA, and PKC mRNAs (P<0.05) and Arc protein. Compared with diabetic rats, GLP-1-treated rats showed significantly improvements in the learning and memory function (P<0.05) with decreased expressions of APP, BACE1, Arc, ERK1/2, and PKA mRNAs (P<0.05) and Arc protein. Conclusion GLP-1 can improve cognitive dysfunctions in diabetic rats possibly by regulating the PKC, PKA, and ERK1/2 pathways and inhibiting Arc expression in the hippocampus.