【摘要】 目的建立一种实验性SD大鼠佐剂性关节炎模型,为类风湿关节炎的研究提供一种简单、实用、可靠的动物模型。方法采用热杀死结核分枝杆菌H37Ra(Mtb)与矿物油混匀,一次性经尾根部皮下注射,诱导SD大鼠实验性类风湿关节炎的发生。在实验周期内,定期检测实验动物体重、血常规,并进行关节炎临床评分、足趾容积测定,以流式细胞仪检测外周血T淋巴细胞亚群变化;以ELASA方法测定血清TNF-α,关节组织中IL-1、IL-6和内皮生长因子(VEGF)水平;同时检测SD大鼠后腿踝关节软骨及滑膜的病理变化,以X-光检查验证模型骨侵蚀程度,通过多项综合指标评价该模型的可靠性。结果SD大鼠经Mtb免疫14d后,大鼠体重明显减轻,外周血白细胞、血小板及单核细胞数明显升高,T淋巴细胞亚群CD4/CD8比值增高。从免疫Mtb10d开始,模型组动物足趾和踝关节出现炎症信号,14～16d达到高峰。免疫28d后,大鼠外周血TNF-α水平升高,关节滑膜组织中IL-1和IL-6及VEGF水平上调。显微镜下病理检测结果显示,模型大鼠关节滑膜增生,淋巴细胞浸润,关节软骨增生。结论由Mtb诱导的SD大鼠关节炎模型与临床RA特征相近,具有模型复制成功率高、操作简单、经济实用等特点,可广泛用于抗类风湿关节炎药物的筛选及实验研究中。更多还原

【Abstract】 Aim To establish and evaluate the simple and effective animal model of rheumatoid arthritis in SD rats induced by heat-killed mycobacterium tuberculosis H37Ra(Mtb).Methods SD rats were immunized s.c.at the base of the tail with Mtb(1 mg/rat) in mineral oil,and then body weight,blood routine,clinical signs of arthritis were observed regularly.And also hind paw volume in SD rats with AA was tested.Meanwhile,T-lymphocyte subset was determined by flow cytometry in peripheral blood,the level of TNF-αin serum and IL-1 and IL-6 and vascular endothe-lial growth factor(VEGF) in joint tissue were tested by ELISA.The ankle pathological change and radiographic evidence of the hind paws of SD rats were observed to evaluate the AA model effects and availability in SD rats.Results When compared with normal control rats,the total number of white blood cells,platelets and monocytes in peripheral blood and ratio of CD4/CD8 was markedly raised after immunization with Mtb.But body weight of model rats was significantly low from day 14 to 28 after injection of Mtb.The inflammatory arthritic lesions such as edema and erythema in the paws appeared after 9～10 d.The peak of inflammation was 14～16 d.The level of TNF-αin serum and IL-1,IL-6 and VEGF in joint tissue was significantly higher in SD rats with Mtb than that in normal control rats at d 28.The histopathological examination revealed cellular infiltration,synovial and cartilage hyperplasia in ankle joints of SD rats.Conclusions The model induced by Mtb in SD rats is more similar in clinical characterization of rheumatoid arthritis in human being.It is a more efficient and simpler manipulative procedure for screening of new anti-arthritis drugs and experimental studying of anti-rheumatoid arthritis.更多还原