褪黑素对小鼠胶原性关节炎的防治作用

Effect of melatonin on collagen-induced arthritis in mice

目的 研究褪黑素 (Melatonin ,MT)对小鼠胶原性关节炎 (Collagen inducedarthritis ,CIA)的防治作用。 方法 在建立小鼠CIA模型的基础上 ,检测小鼠足爪炎症的肿胀度和评分 ,分光光度计法检测前列腺素 ,3 H TdR参入法检测脾淋巴细胞增殖反应 ,白细胞介素 1(IL 1)和IL 2 ,HE染色法对关节组织作病理检查。结果 MT (10、10 0、10 0 0 μg·kg-1)ig给药能明显减轻CIA小鼠的关节炎症 ,抑制CIA小鼠过高的ConA增殖反应和小鼠腹腔巨噬细胞IL 1的过度产生 ,降低脾淋巴细胞产生的IL 2的水平 ,降低CIA小鼠踝关节组织中高水平的PGE含量 ,同时病理检查发现预防用药MT可改善局部关节炎症状况 ,抑制CIA小鼠滑膜增生 ,减轻炎性细胞浸润。结论 MT对CIA具有防治作用 。

AIM To investigate the effect of melatonin on collagen-induced arthritis (CIA). METHODS The model of mice CIA was prepared and the change of secondary paw-swelling and the mean scores of arthritis were observed. The level of PGE was assayed by spectrophotometer; Meanwhile, 3H-TdR incorporation was used to detect ConA-and LPS-induced splenocytes proliferation and the production of interleukin (IL)-1 and IL-2. Hepatic pathological examination was performed by Hematoxylin-eosin (HE) stain method. RESULTS Treatment of ig melatonin(10,100, 1 000 μg·kg -1) significantly decreased inflammation of the arthritis. The increased ConA-induced splenocytes proliferation ,PGE, IL-1 and IL-2 production in mice CIA were reversed by melatonin. Meanwhile, the pathological examination showed that articulus cartilage degeneration with synovial hyperplasia and inflammatory cells infiltration in CIA mice was suppressed by ig melatonin. CONCLUSION Melatonin has inhibitory effect on mice CIA which may be related to its immunoregulative function.