中文摘要：

目的本研究通过观察脑卒中后抑郁（poststrokedepression，PSD）大鼠给予抗抑郁药物西酞普兰干预后，观察下丘脑TNF—α的表达变化，并探讨PSD发病机制和潜在的药物治疗机制。方法经旷场实验筛选出18只大鼠，随机分为对照组6只，另12只大鼠经过单侧大脑中动脉线栓法后，又随机分为PSD组6只和西酞普兰组6只，经慢性不可预见性应激后，通过旷场实验和糖水实验观察各组大鼠的行为学改变，定量PCR检测各组大鼠下丘脑TNF—αmRNA的表达改变。结果与对照组比较，PSD组的水平活动、直立探索和糖水喜好明显下降，差异有统计学意义（P〈O．01）；西酞普兰组的水平活动、直立探索和糖水喜好较PSD组明显升高，差异有统计学意义（P〈0．05）。PSD组下丘脑TNF—αmRNA水平较对照组明显升高，差异有统计学意义（P〈0．05）；西酞普兰组下丘脑TNF-αmRNA水平较PSD组明显下降，差异有统计学意义（P〈o．05）。结论抗抑郁药物西酞普兰可通过调节下丘脑TNF—α治疗PSD。

英文摘要：

Objective To study the expression of TNF-α in hypothalamus of rats by observing post stroke depression and its pathogenesis after citalopram treatment. Methods Eighteen rats that underwent open field test were randomly divided into the control group（n= 6） and experimental group（n=12）. The rats in experimental group were further divided into post stroke depression group （n=6） and citalopram treatment group（n=6） after left middle cerebral artery occlusion. Behaviors in these two groups were observed by open field test and sugar-water test, respectively. Expression of TNF-α mRNA in hypothalamus of rats was detected by quantitative polymerase dhain reaction. Results The levels of horizontal and vertical activities and the preference for sug- ar-water were significantly lower in post stroke depression group than in control group（P〈0.01） and significantly higher in citalopram treatment group than in post stroke depression group（P〈 0. 05）. The TNF-α mRNA expression level in hypothalamus was significantly higher in post stroke depression group than in control group（P〈0.05） and significantly lower in post stroke de- pression group than in citalopram treatment group（P〈0.05）. Conclusion Citalopram exerts its therapeutic effect on post stroke depression by down-regulating the expression of TNF-α in hypo- thalamus of rats.