不同脂肪含量饮食对小鼠脂肪细胞肥胖相关基因表达的影响

目的 探讨饮食中的脂肪含量对小鼠营养性肥胖症的作用.方法 将40只C57BL/6小鼠随机分为4组,分别喂养含量不同的猪油餐.第1～4组猪油所提供热量分别为O%、20%、40%和60%,单位重量饲料的总热量不变.第7周末测定小鼠的血糖、血脂等指标,并取肝脏和肾脏作病理切片,取白色脂肪组织做基因芯片分析.结果 第4组小鼠的体重、血糖、血脂、胰岛素、肥胖指数与第1组小鼠比较有统计学差异;肝细胞和肾近曲小管细胞有大最脂质沉积;脂肪细胞中的肥胖相关基因有13个的表达是2倍以上上调,有8个的表达是2倍以下下调.结论 高脂饮食通过调节小鼠脂肪细胞中刺激食欲的基因、抑制食欲的基因和能量消耗相关基因使小鼠发生肥胖、高胰岛索血症和脂质代谢异常.

Effects of the dietary fat on adipose-associated gene expressions of adipocytes in mice

Objective To observe the effect of dietary fat on diet-induced obesity in mice. Methods Forty 3-week.old male C57BL6 mice were randomly divided into four groups(1-4)fed withdiets of different amounts of lard 0%,20%,40%and 60%of total energy (kcal)].Plasma glucose,lipids,insulin and other parameters were measured after 7 weeks.Moreover,the livers and kidneys were taken for histopathological evaluation and white fatty tissues were taken to analyse adipose'associated geneexpressions using gene chip technology.Results There were statistically significant differences in weight, blood slucose.triglyceride,total cholesterol,high-density lipoprotein-cholesterol,low-density lipoprotein cholesterol.insulin and adiposity index between the 1st and the 4th group.Obvious lipid deposition in the liver and kidney sections was found in the 4th group.Thirteen adipose-associated genes were up-regulated in exDression and 8 genes down.regulated by over 2-fold in the adipocytes of the 4th group. Conclusions The mice fed with high-fat diet developed evident obesity,insulin resistance and abnormal lipid metabolism.The obesity was induced by high-fat diet via regulating some of the orexigenic genes,anorexigenie genes and the genes involved in energy expenditure in adipocytes of mice.