长期高脂饮食对大鼠掠食行为的影响及机制

Effect of chronic high-fat diet on predation behavior in rats

目的:研究大鼠长期高脂饮食对其掠食行为的影响及机制。方法:将10只4周龄雌性SD大鼠随机均分为对照组和高脂组。对照组常规饲料饲养,高脂组以高脂饲料饲养,15周之后进行旷场实验、掠食行为观察,行为学观察结束后立即处死动物,采用免疫组织化学技术检测c-Fos蛋白在大鼠前扣带皮质的表达情况。结果:高脂组大鼠在非竞争性掠食行为与竞争性掠食行为中掠食量均低于对照组(P<0.001);高脂组前扣带皮质区c-Fos蛋白表达低于对照组(P<0.001)。结论:长期高脂饮食可降低大鼠的掠食量,且前扣带皮质区c-Fos蛋白表达减少、神经元功能下降。

Objective: To observe the eff ect and mechanism of chronic high-fat diet on predation behavior in rats. Methods: Ten female SD rats with 4-week-old were randomly divided into a normal control group (NC group,n=5) and a chronic high-fat diet group (HF group,n=5). The rats in the NC group received the regular diet while rats in the HF group were fed with high-fat diet. Fitf een weeks later, the predation behavior of rats was evaluated by open if eld test and food foraging tests. At the end of experiments, the rats were killed and brain tissues were collected for evaluation of c-Fos protein expression in anterior cingulate cortex by immunohistochemical assay. Results: hT e predation behavior of rats in the HF group was signiif cantly impaired in the competitive or non-competitive food foraging test compared with the control rats (P<0.001). hT e c-fos protein expression in anterior cingulate cortex of rats from the HF group was signiif cantly decreased (P<0.001). Conclusion: Long time high-fat diet can aff ect the predation behavior of rats, which is related todysfunction of neuron in anterior cingulate cortex.