不同配方饲料对DEN诱导小鼠肝癌模型建立的影响

Effect of different formula diets on mouse model with DEN-induced hepatocellular carcinoma

目的建立二乙基亚硝胺(DEN)诱导的小鼠肝癌模型并使用两种不同配方饲料:SPF级小鼠大鼠全价配合饲料和AIN93-G配方合成饲料分别喂养,探讨不同饲料喂养对构建DEN诱导小鼠肝癌模型的影响。方法14日龄雄性C57BL/6小鼠腹腔一次性注射DEN溶液,给药量25 mg/kg体重,建立小鼠肝癌模型。小鼠离乳后分为两组,一组以常规SPF级大小鼠全价配合饲料喂养,另一组以AIN-93G配方合成饲料喂养。模型小鼠生长至9月龄时处死,取肝脏组织称重,观察并记录肝癌生长情况。结果全价饲料组小鼠肝脏全部产生肿瘤,AIN-93G组小鼠体重和肝脏重量明显低于全价饲料组小鼠,肝癌发生率、肿瘤结节数量和大小也明显低于全价饲料组小鼠。结论全价饲料喂养的小鼠DEN诱导肝癌模型造模成功,而AIN-93G饲料喂养的小鼠诱导肝癌的发生发展受到抑制,同时小鼠体重明显下降,提示了饮食因素在动物疾病模型建立中起到的关键作用。

Objective To establish a mouse model of diethylnitrosamine（DEN）-induced hepatocellular carcinoma （HCC）,and to explore the effects of two different diet formulas on the establishment of DEN-induced HCC model.Methods SPF C57BL/6 mice （8 males and 8 females） were injected intraperitoneally with 25 mg/kg DEN at day 14 to establish a HCC model.The mice were divided into two groups after weaning.One group was fed with the SPF class rodents cereal-based diet,another group was fed with AIN-93G formula diet.The mice were sacrificed at the age of 9 months.The livers were weighed and the growth of liver cancer was observed and recorded.Results All the mice in the cereal-based diet group developed HCC as expected.The body weight and liver mass of the mice in the AIN-93G diet group were significantly lower than that of the cereal-based diet group.The incidence of HCC,and the number and size of tumor nodules were also significantly lower in the AIN-93G diet group than that in the cereal-based diet group.Conclusions DEN-induced HCC model has been successfully established in mice fed with cereal-based diet,while mice fed with AIN93-G diet prevented the development of DEN-induced HCC,and their body weight was decreased significantly,suggesting that dietary factors play a key role in establishment of animal disease models.