中药复方开心散调控慢性压力应激小鼠海马神经新生抗抑郁作用机制研究

Exploration of Anti-depression Mechanism of Kai-Xin-San via Regulation of Neurogenesis of Hippocampus on Chronic Unpredictable Mild Stress Induced Mice

目的评价开心散调控慢性不可预知压力应激模型小鼠海马神经新生抗抑郁效用,探讨作用机制。方法采用慢性不可预知压力应激构建抑郁小鼠模型,给以开心散水提取物。通过糖水偏嗜率检测、强迫游泳实验、悬尾实验等评价模型小鼠抑郁样行为。采用免疫荧光法检测模型小鼠海马区神经新生情况。采用蛋白免疫印迹法检测小鼠海马神经干细胞标志物巢蛋白以及Wnt/β-catenin信号通路相关蛋白的表达。采用ELISA法检测相应组织中压力应激因子如促肾上腺皮质激素释放因子、促肾上腺皮质激素、皮质醇与神经营养因子如脑源性神经营养因子、神经生长因子的表达。采用小鼠原代神经干细胞,采用免疫荧光法检测开心散对原代神经干细胞增殖情况,采用蛋白免疫印迹法检测巢蛋白以及Wnt/β-catenin信号通路相关蛋白的表达。结果开心散水提取物显著增加抑郁模型小鼠糖水偏嗜率,降低强迫游泳与悬尾不动时间;同时促进海马组织神经元新生,降低压力应激因子表达,提高神经营养因子表达,上调巢蛋白表达并调控Wnt/β-catenin信号通路。开心散提取物还可促进小鼠原代神经干细胞增殖及蛋白表达,并促进β-catenin入核,调控Wnt/β-catenin信号通路。结论开心散具有改善小鼠抑郁样行为效用,促进海马神经新生以及调控Wnt/β-catenin通路可能是其抗抑郁的重要作用环节与机制。

Objective To explore the anti-depression mechanism of Kai-Xin-San(KXS)via regulation of neurogenesis in hippocampus of depression-like mice.Methods The extracts of KXS were prepared and the anti-depression effects of KXS were evaluated by behavioral tests on chronic unpredictable mild stress(CUMS)induced depression-like mice.Evaluating depression-like behavior in CUMS mice through sucrose preference test,forced swimming test,tail suspension test,and other methods.Neurogenesis in hippocampus were determined by immunofluorescence assay.In addition,effects of KXS on regulating nestin expression and Wnt/b-catenin signaling pathway were explored by western blotting analysis.Amounts of cortisol,corticotropin-releasing factor(CRF),adrenocorticotropic hormone(ACTH),brainderived neurotrophic factor(BDNF)and nerve growth factor(NGF)were determined by ELISA tests.Mouse primary neural stem cells(NSC)was used to evaluate the effect of KXS on promoting its proliferation by immunofluorescence assay.In addition,effects of KXS on regulating nestin and Wnt/β-catenin signaling pathway were also explored by Western blotting analysis.Results KXS significantly ameliorated the depression-like behaviors in presence of increased sucrose preference rate and decreased immobile time of tail suspension and forced swimming.KXS significantly promoted the neurogenesis in the hippocampus and expressions of nestin,reduced the expressions of cortisol,CRF,ACTH,increased the expressions of BDNF,NGF,and regulated Wnt/β-catenin signaling pathway.KXS also promoted the proliferation of NSCs and expressions of nestin,enhanced the translocation of b-catenin into nucleus,and regulated the expressions of proteins of Wnt/β-catenin signaling pathway.Conclusion KXS promoted neurogenesis in hippocampus and regulated Wnt/β-catenin pathway,which might contribute to its antidepressant effect.