高脂饮食喂养肥胖模型小鼠的构建:分析营养因素和代谢综合征的关系

Construction of obese mouse models with high fat diet feeding: relationship between nutritional factor and metabolic syndrome

背景:代谢综合征对人体的危害极大,且受到多种因素的影响。通过构建饮食诱导动物模型,可以更好的分析营养因素和代谢综合征之间的关系,为临床治疗等提供可靠的参考依据。目的:构建高脂饮食喂养肥胖小鼠模型,探讨营养因素和代谢综合征的关系。方法:选择30只小鼠随机分为模型组20只和对照组10只,分别予以高脂饮食纯化饲料和普通饲料喂养,连续喂养10周。结果与结论:与对照组相比,高脂饮食纯化饲料喂养后1周,模型组小鼠即出现体质量升高,且随着喂养时间增加呈现出差异逐渐增大的情况;喂养后8周,模型组的体质量指数和显著升高(P<0.05)。喂养后4周,模型组的空腹静脉全血血糖即显著升高,且随着喂养时间的增长呈现出逐渐上升的情况;喂养后5周,模型组的空腹胰岛素水平也开始出现升高;经口服糖耐量实验,随着喂养时间的增长,模型组小鼠表现出糖耐量逐渐下降的趋势;喂养后8周,模型组的血清总胆固醇、高密度脂蛋白胆固醇水平均出现显著性上升高(P<0.05);喂养后10周,模型组的三酰甘油、血清总胆固醇、低密度脂蛋白胆固醇和高密度脂蛋白胆固醇均升高(P<0.05)。结果证实,实验成功构建了高脂饮食喂养肥胖小鼠模型,可能模拟人类的代谢综合征的自然发病过程,且营养因素与代谢综合征密切相关。

BACKGROUND： Metabolic syndrome greatly harms the human body, and is affected by many factors. Through constructing diet-induced animal models, we can better analyze the relationship between nutritional factor and metabolic syndrome, and provide reliable references for the clinical treatment of this disorder. OBJECTIVE： To construct obese mouse models with high-fat diet feeding and discuss the relationship between nutritional factor and metabolic syndrome. METHODS： Thirty mice were selected and randomly divided into model group（n=20） and control group（n=10）, and were fed with high-fat and normal animal feeds for 10 consecutive weeks. RESULTS AND CONCLUSION： Compared with the control group, after 1 week of feeding with high-fat animal feeds, body weight of mice in the model group raised, and differences gradually increased with the feeding time increased. After 8 weeks of feeding, body mass index of mice in the model group significantly raised（P〈0.05）. After 4 weeks of feeding, fasting venous blood glucose level of mice in the model group significantly raised, and showed a gradual rise trend with feeding time. After 5 weeks of feeding, fasting insulin level of mice in the model group also began to rise. The oral glucose tolerance test showed that mice in the model group showed a gradual downward trend of glucose tolerance with feeding time. After 8 weeks of feeding, serum levels of total cholesterol and high density lipoprotein cholesterol in the model group significantly raised（P〈0.05）. After 10 weeks of feeding, serum levels of triacylglycerol, total cholesterol, low density lipoprotein cholesterol and high density lipoprotein cholesterol in the model group raised（P〈0.05）. The results demonstrate that obese mouse models were successfully constructed with high-fat diet feeding, which can simulate the natural progression of metabolic syndrome in human, moreover, the nutritional factor is closely related to metabolic syndrome.