MSG肥胖大鼠胰岛素抵抗特征的初步研究  

Preliminary study of insulin resistance induced by neonatal monosodium glutamate treatment in normal Wistar rats

作　　者：丁世英[1] 申竹芳[1] 谢明智[1] 

机构地区：[1]中国医学科学院.中国协和医科大学药物研究所,北京100050

出　　处：《中国药理学通报》2001年第2期181-185,共5页Chinese Pharmacological Bulletin

基　　金："九五"国家攀登计划预选项目资助;No 970211018

摘　　要：目的观察ＭＳＧ大鼠发育生长过程中糖脂代谢以及对胰岛素敏感性的变化，并研究胰岛素增敏剂吡咯列酮（ｐｉ－ｏｇｌｉｔａｚｏｎｅ）的作用。方法建立ＭＳＧ大鼠模型。３ｍｏｎ及１０ ｍｏｎ时，分另给药吡咯列酮，观察药物对 ＭＳＧ大鼠血糖。甘油三酯、总胆固醇、游离脂肪酸、血胰岛素以及葡萄糖耐量、胰岛素耐量、糖异生等的影响。结果和正常对照组相比，ＭＳＧ大鼠表现为血糖略有升高，血脂及血胰岛素升高，具糖耐量异常趋势，胰岛素耐量异常，糖异生增加，给药后均有改善。结论ＭＳＧ大鼠可能由于肥胖导致脂质代谢异常，从而影响胰岛素敏感性，造成严重的胰岛素抵抗。胰岛素增敏剂吡格列酮可明显改善这种代谢异常。提示ＭＳＧ肥胖大鼠可作为一种较经济简便的胰岛素抵抗动物模型，用于药物评价以及作用机制研究。AIM To study the glucose and lipids metabolism and insulin sensitivity of MSG rats during their growing period, and to evaluate the effects of insulin sensitizer pioglitazone on the model rats. METHODS Body weights were measured regularly, and glucose and insulin tolerance tests were taken. In their 3 and 10 months old, rats were given insulin sensitizer pioglitazone orally, then the effects on serum glucose, triglyceride, cholesteral, free fatty acid and insulin concentrations were determined. RESULTS Compared with normal rats, a slight but significant increase of glucose in MSG rats was revealed. The serum triglyceride, cholesteral, free fatty acid and insulin concentrations were significantly higher in model rats. Moreover, gluconeogenesis increased significantly, and insulin tolerance showed abnormal. However, glucose tolerance was nearlly normal. Pioglitazone could ameliorate all these metabolic disorders. CONCLUSION Obesity and insulin resistance were induced by injecting monosodi- um glutamate (MSG) to neonatal Wistar rats. Piogli- tazone can significantly improve the insulin sensitivity of Msc rats. These results suggested that MSG obese rats can be used as an easily accessible and inexpensive insulin resistance animal model for evaluating the efficacy and mechanisms of antidiabetic agents.

关 键 词：胰岛素抵抗 MSG大鼠 肥胖症 胰岛素增敏剂 肥胖 

分 类 号：R589.2[医药卫生—内分泌] R977.15[医药卫生—内科学]