不同电针对慢性应激抑郁模型大鼠下丘脑促甲状腺激素释放激素表达的影响

摘要

目的：观察不同电针对慢性应激抑郁模型（ CUMS）大鼠下丘脑中促甲状腺激素释放激素（ TRH）表达的影响，探讨TRH在大鼠实验性抑郁症发病过程中的作用机制及不同电针干预对其的影响。方法：将60只清洁健康雄性SD大鼠，随机分为正常组、模型组、脉冲电针组、音乐电针组及氟西汀组，每组12只。孤养结合CUMS21天复制抑郁症模型，通过开野试验观察大鼠行为学变化，采用免疫组织化学法、酶联免疫吸附法及荧光实时定量PCR分别检测TRH在大鼠下丘脑中的表达情况。结果：模型组大鼠开野实验水平运动及垂直运动明显减少，脉冲电针组、音乐电针组及氟西汀组均可改善此变化；模型组大鼠下丘脑内TRH表达均明显降低，脉冲电针组、音乐电针组及氟西汀组可逆转此病理变化，但氟西汀组治疗效果较两组电针治疗效果略胜一筹；两组电针治疗之间无明显统计学差异。结论：抑郁大鼠的TRH含量低于正常；电针治疗抑郁症可能是通过升高TRH的含量而发挥抗抑郁作用。音乐电针与脉冲电针治疗抑郁症效果差异不明显。%Objective:To investigate the influence on the expression of TRH in the hypothalamus of rats with chronic un-predictable mild stress by different electro-acupuncture( EA) treatments, to elucidate the possible role of TRH in the development of experimental depression and the effect of different EA for them.Methods:Adult male SD rats were ran-domly divided into a normal control group(n=12),a model group (n=12),a pulsed EA group(n=12),a music EA group( n=12) and a fluoxetine group( n=12) .Depression models were established by lonely raising and chronic unpre-dictable mild stress for 21 days.Open-field test was performed to test the behavior of rats.The expression of hypothala-mus TRH was detected by using immunohistochemistry , enzyme linked immunosorbent assay( ELISA) and real-time PCR techniques respectively.Results:The cross and rear scores of the model group were significantly lower than those in the normal control group, while pulsed EA group, music EA group and fluoxetine group could reverse it.The expres-sion of hypothalamus TRH in model group decreased significantly,and the three kinds of treatment could improve these pathological change, but the effect of fluoxetine was better than other two EA groups;in addition, there was no statistical difference between the effects of pulse-EA and music-EA treatments.Conclusion:The levels of TRH in hypothalamus of depression rats are lower than normal.EA treatments may have antagonism against depression by increasing the levels of TRH in hypothalamus,and there is no difference between the effects of pulsed EA treatment and music EA treatment on depression.