降纤药治疗实验性自身免疫性脑脊髓炎小鼠的机制

目的:研究降纤药巴曲酶对实验性自身免疫性脑脊髓炎(EAE)小鼠的预防及治疗作用,初步探讨纤维蛋白沉积在多发性硬化(MS)中的作用机制。方法:采用MOG35-55免疫的C57雌性小鼠,诱发EAE动物模型,分别在免疫后立即(预防组)及免疫后出现症状(治疗组)隔日连续给予降纤药巴曲酶注射至实验结束,观察发病情况并进行临床症状评分。于免疫后30天、40天及60天分别将预防组、治疗组及EAE对照组小鼠脊髓与小脑组织取材后进行组织病理学与免疫组化染色分析,Western blot及实时荧光定量PCR技术观察药物干预对炎性浸润、脱髓鞘、纤维蛋白沉积及胶质细胞活化的影响。结果:降纤预防组及治疗组均可明显减轻EAE小鼠的发病症状、降低临床评分。预防组和治疗组较EAE未用药对照组小鼠炎性细胞浸润明显减少、髓鞘脱失及胶质细胞活化减轻,但轴索损害的改善作用不明显。免疫组化及免疫荧光显示,预防组和治疗组较EAE未用药对照组的髓鞘碱性蛋白(MBP)表达升高而胶质纤维酸性蛋白(GFAP)表达降低,Western blot结果示MBP蛋白表达升高而p-Akt表达降低。实时荧光定量PCR技术也证实了预防及治疗组MBP的mRNA表达升高,组织型纤溶酶原激活物(-tPA)的mRNA表达也升高。结论:在EAE的发病过程中纤维蛋白沉积发挥了重要作用,巴曲酶通过有效降低EAE小鼠体内的纤维蛋白从多个方面改善临床症状和发病过程。

Fibrinogen depleting agent Batroxobin attenuates experimental autoimmune encephalomyelitis

Objective:To explored the capacity of prophylactic and therapeutic potential of fibrin depletion by batroxobin to affect the inflammatory demyelination process in experimental autoimmune encephalomyelitis(EAE) mice model.Methods:In MOG-induced EAE,batroxobin was separately injected after immunization immediately(prevention) and after the appearance of clinical manifestations(suppression).At the time of postimmunization(p.i.) day 30,40,60,spinal cords and cerebellum tissue samples from EAE mice were collecte...