自身免疫性前列腺炎大鼠机械痛阈变化的研究

Changes of mechanical pain threshold in rats with experimental autoimmune prostatitis

目的:建立免疫性前列腺炎大鼠模型,探讨模型大鼠机械痛阈的变化规律,为免疫性前列腺炎疼痛机制的研究及药物治疗提供动物实验依据。方法:将20只180～220 g的雄性Wistar大鼠随机均分为模型组与对照组,模型组大鼠分别于第0、30天皮下多点注射60 mg/ml大鼠前列腺蛋白提纯液,同时腹腔注射百白破疫苗及弗氏完全佐剂,建立免疫性前列腺炎大鼠模型。造模8周后处死动物,HE染色观察各组前列腺组织的病理学表现;运用Von Frey纤毛机械刺激针,于实验开始第0天起每周触压各组大鼠的后足,测定其对机械性轻压和轻触痛的反应阈值。结果:HE染色可见模型组大鼠前列腺组织出现不同程度的慢性炎症表现。与对照组[初始痛阈值为(69.33±4.99)g,第8周痛阈值为(66.53±4.48)g]相比,模型组大鼠的机械性痛阈值随造模时间的延长逐渐降低[模型组初始痛阈值为(65.52±6.27)g,第8周痛阈值为(23.67±4.09)g],差异有统计学意义(P<0.01);且两组大鼠在不同时间点机械性痛阈的变化趋势不同,此差异有统计学意义(P<0.01)。结论:本研究成功建立了自身免疫性前列腺炎大鼠模型,且造模后大鼠机械痛阈值逐渐降低,出现异常痛敏表现。

Objective ： To observe the changes of the mechanical pain threshold in the rat model of autoimmune prostatitis, explore the mechanism of autoimmune prostatitis pain and offer some animal experimental evidence for the drug therapy of the condition. Methods ： Twenty male Wistar rats weighing 180 - 220 g were divided into a model and a control group. The autoimmune prostatitis model was established by subcutaneous injection of an extract of male rat prostate glands （RPG） at 60 mg/ml in Freundg complete ad- juvant （FCA） and pertussis-diphtheria-tetanus vaccine at 0 and 30 days, respectively. Mechanical tactile hyperalgesia was measured once a week using Von Frey Filaments from the beginning of the study. At 8 weeks after modeling, the rats were sacrificed and the prostate tissues harvested for observation of histomorphologieal changes by HE staining. Results ： HE staining revealed different degrees of benign prostatitis in the model rats. Compared with the controls, the mechanical pain threshold in the model rats was significantly decreased with the increased time of modeling, from （65.52 ±6.27） g at 0 week to （23.67 ±4.09） g at 8 weeks （P 〈0.01 ）. Statistically significant differences were found in the variation trend at different time points between the two groups （ P 〈 0.01 ）. Conclusion ： Autommune prostatitis models were successfully established in rats and hyperalgesia was induced after modeling.