抑郁模型大鼠海马内特异性microRNAs的筛选以及柴胡疏肝散的干预作用

Screening of specific microRNA in hippocampus of depression model rats and intervention effect of Chaihu Shugan San

目的:筛选慢性应激抑郁模型大鼠海马内特异性表达的microRNAs,同时观察中药柴胡疏肝散对海马内microRNAs表达的影响。方法:将SD大鼠随机分为正常对照组、模型对照组、柴胡疏肝散组。采用慢性轻度不可预见性应激配合孤养复制抑郁模型,运用敞箱试验和蔗糖水消耗实验观察大鼠行为改变;采用microRNA芯片检测海马内microRNAs的表达。结果:与对照组比较,在模型组海马内差异达2倍以上的特异性miRNA共计有13个,其中下调的miRNA包括miR-298,miR-130b,miR-135a,miR-323,miR-503,miR-15b,miR-532,miR-125a,上调的miRNA包括miR-7a,miR-212,miR-124,miR-139,miR-182;在这13个特异性miRNA中有2个(即miR-125a和miR-182)在柴胡疏肝散组中予柴胡疏肝散干预后又恢复正常。结论:该研究初步发现与抑郁症发病相关的海马内13个特异性microRNAs,其中miR-125a和miR-182在中药柴胡疏肝散干预后恢复正常,这2个microRNAs可能是中药柴胡疏肝散抗抑郁的作用靶点,应进一步分析其靶基因以及作用机制。

Objective： To screen microRNAs with specific expression of in hippocampus of rats with chronic stress induced depression model, and observe the effect of traditional Chinese medicine Chaihu Shugan San on the expression of microRNA in hippocampus. Method： SD rats were randomly divided into 3 groups ： the normal control group, the model control group and the Chaihu Shugan San group. The depression model was replicated by unpredictable chronic mild stress combined with separation. Behavioral changes of the rats were observed by Open-field test and sucrose solution consumption test, and the expression of microRNAs in hippocampus was assayed by microRNA micro-array. Result： Compared with the normal control group, there were 13 specific miRNAs in hippocampus in the model control group with the expression difference of more than 2 times. Among them, down-regulating miRNAs included miR- 298, miR-130b, miR-135a, miR-323, miR-503, miR-15b, miR-532, and miR-125a, and the up-regulation miRNAs included miR- 7a, miR-212, miR-124, miR-139, and miR-182. Among the 13 specific miRNAs, miR-125a and miR-182 recovered to normal after intervention with Chaihu Shugan San in the Chaihu Shugan San group. Conclusion： This study preliminarily found that 13 specific miRNAs in hippocampus are related to depression. Among them, miR-125a and miR-182 recover to normal after intervention with Chaihu Shugan San, which may be the target points of the antidepressant effect of Chaihu Shugan San. We shall further analyze the target genes and their mechanisms.