橙皮苷对慢性应激抑郁模型大鼠行为学及HPA轴的影响

目的:观察橙皮苷对慢性应激抑郁模型大鼠行为学及下丘脑-垂体-肾上腺(HPA)轴的影响.方法:采用慢性轻度不可预见性应激(CUMS)制备大鼠抑郁模型,60只雄性SD大鼠随机分为正常组、模型组、橙皮苷(40,80,160 mg· kg-1)组及阳性药氟西汀(10mg.kg-1)组.连续灌胃给药3周,糖水偏爱实验和强迫游泳实验测定动物行为学,检测血清皮质酮(CORT)、肾上腺指数、下丘脑促肾上腺皮质激素释放激素(CRF) mRNA以及下丘脑室旁核糖皮质激素受体(GR)蛋白,探讨橙皮苷的抗抑郁作用及机制.结果:与模型组相比,橙皮苷(40,80,160 mg·kg-1)治疗组大鼠的糖水消耗量均明显增加、强迫游泳不动时间有不同程度的减少.同时,橙皮苷能逆转CUMS大鼠过高的血清CORT水平和肾上腺指数,并能抑制CUMS大鼠下丘脑CRF mRNA表达、上调室旁核GR蛋白表达.结论:橙皮苷能有效改善CUMS大鼠行为学,表现出抗抑郁作用,其机制可能与调节HPA轴的功能有关.

Effect of hesperidin on behavior and HPA axis of rat model of chronic stress-induced depression

Objective: To observe the effect of hesperidin on behavior and hypothalamic-pituitary-adrenal (HPA) axis of rat model of chronic stress-induced depression. Method: Chronic unpredictable mild stress (CUMS) was used to establish the rat depression model. Sixty male SD rats were divided randomly into six groups: the normal group, the model group, the hesperidin (40, 80, 160 mg·kg^-1) group and the positive fluoxetine (10 mg·kg^-1) group. They were orally administered with drugs for three weeks. The sucrose preference test and the forced swimming test (FST) were assayed to detect animal behavior. The levels of corticosterone (CORT) in serum, mRNA of corticotropin release factor (CRF) in hypothalamus as well as protein expression of glucocorticoid receptor (GR) in paraventricular nucleus (PVN) were determined to clarify the anti-depression effect and mechanism of hesperidin. Result: Compared with the model group, rats in the hesperidin (40, 80, 160 mg·kg^-1) treatment group showed significant increase in the sucrose consumption and decrease in the immobility time in FST to varying degrees. Meanwhile, the excessively high serum CORT and adrenal index of CUMS rats were reversed by treatment with hesperidin. In addition, hesperidin inhibited CRF mRNA expression in hypothalamus and up-regulated GR protein expression in PVN among CUMS rats. Conclusion: Hesperidin could effectively improve the behavior of CUMS rats and show the anti-depression effet. Its mechanisms may be related to the function of regulating HPA axis.