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山东大学学报(医学版) ›› 2012, Vol. 50 ›› Issue (6): 5-.

• 内分泌与代谢疾病研究 • 上一篇    下一篇

罗格列酮经LRP-1途径降低糖尿病大鼠脑微/小血管中β-淀粉样蛋白含量的研究

胥文娟1,朱梅佳2,赵张宁2,孙忠文1,鲍梦馨1   

  1. 山东大学 1.医学院, 济南 250012; 2.附属千佛山医院神经内科, 济南 250014
  • 收稿日期:2012-02-01 出版日期:2012-06-10 发布日期:2012-06-10
  • 通讯作者: 朱梅佳(1961- ),女,教授,硕士生导师,主要从事脑血管病的研究。 E-mail: zhumeijia1818@163.com
  • 作者简介:胥文娟(1985- ),女,硕士研究生,主要从事脑血管病的研究
  • 基金资助:

    山东省自然科学基金资助项目(ZR2010HM101);山东省科技攻关基金资助项目(2007GGWZ02056)

Effects of rosiglitazone on amyloid-beta peptide clearance from brain
micro/small vessels by -regulation of LRP-1 in diabetic rats

XU Wen-juan1, ZHU Mei-jia2, ZHAO Zhang-ning2, SUN Zhong-wen1, BAO Meng-xin1   

  1. 1. School of Medicine, Shandong University, Jinan 250012, China;
    2. Department of   Neurology, Qianfoshan Hospital Affiliated to Shandong University, Jinan 250014, China
  • Received:2012-02-01 Online:2012-06-10 Published:2012-06-10

摘要:

目的   研究罗格列酮对不同病程糖尿病大鼠脑微/小血管中低密度脂蛋白受体相关蛋白-1(LRP-1)表达的影响及其清除β-淀粉样蛋白(Aβ1-40)的机制。方法   采用自发性2型糖尿病大鼠(GK大鼠)作为动物模型,将其按病程分为6月龄及3月龄2组,其中6月龄组再随机分为罗格列酮干预组(DM6RSG组)和非干预组(DM6组),3月龄GK大鼠(DM3组)作为病程对照组;采用免疫组织化学法定位检测各组脑微/小血管上Aβ1-40及LRP-1的表达,酶联免疫吸附法(ELISA)检测各组脑组织中Aβ1-40及LRP-1蛋白的表达量,RT-PCR定量检测脑组织中LRP-1mRNA的表达。结果   与DM3组相比,DM6组Aβ1-40的表达明显增加(P<0.01);与DM6组相比,DM6RSG组Aβ1-40的表达明显减少(P<0.01),LRP-1和LRP-1mRNA的表达均明显增加(P均<0.05)。结论   随糖尿病病程增长,Aβ140在脑微/小血管中沉积明显增多,罗格列酮可上调LRP-1和LRP-1mRNA的表达并明显减少Aβ1-40在糖尿病脑组织微/小血管中的沉积。

关键词: 糖尿病;大鼠;淀粉样β蛋白;LDL受体相关蛋白质1;过氧化物酶增殖体激活受体γ

Abstract:

Objective   To investigate the effects of rosiglitazone on expression of low-density lipoprotein receptor-related protein 1 (LRP-1) and the clearance mechanism of 40-aminoacid form of amyloid beta (Aβ1-40) in brain micro/small vessels in different courses of diabetic rats. Methods   Goto-Kakizaki (GK) rats were used as type 2 diabetic models. The GK rats were randomly divided into three groups: the 3-month-old GK rats group (DM3 group), the 6-month-old GK rats group (DM6 group) and the DM6 treated with rosiglitazone group (DM6RSG group). The DM3 group also acted as the control group. Expressions of Aβ1-40 and LRP-1 were detected by immunohistochemistry and enzyme-linked immunosorbent assays (ELISA). Expressions of LRP-1mRNA were detected by RT-PCR. Results    Compared to that of the DM3 group, expression of Aβ1-40 in the brain tissue was higher in the DM6 group (P<0.01). Compared to those of the DM6 group, expressions of LRP-1 and LRP-1mRNA in the brain tissue were higher in the DM6RSG group (P<0.05), however, expression of Aβ1-40 in the brain tissue was lower in the DM6RSG group than that of the DM6 group (P<0.01). Conclusion   With diabetes mellitus progression, the deposition of Aβ1-40 in brain micro/small vessels significantly increases. Rosiglitazone can up-regulate expressions of LRP-1 and LRP-1mRNA and then decrease the deposition of Aβ1-40 in diabetic brain tissue micro/small vessels.

Key words: Diabetes mellitus; Rats; Amyloid beta-protein; LDL-receptor related protein 1; Peroxisome proliferatoractivated receptor-γ

中图分类号: 

  • R743.3
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