Ann Rheum Dis:瓜氨酸化的纤维蛋白会加剧类风湿关节炎的炎症反应

2013-09-10 佚名 丁香园

在RA早期病程中,抗瓜氨酸抗体(ACPA)和瓜氨酸化纤维蛋白原抗体(ACF)的出现预示着关节炎症较抗体阴性的患者将更加严重。纤维蛋白在关节局部的沉积是类风湿关节炎(RA)的病理特点之一,与早期病程的发病机制和病情的严重程度都密切相关。尤其当这些纤维蛋白一旦经瓜氨酸化,即可成为ACPA的自身抗原而进一步触发RA的发生。来自瑞士苏黎世大学实验风湿病学中心的Olga Sanchez-Pernaute等研

在RA早期病程中,抗瓜氨酸抗体(ACPA)和瓜氨酸化纤维蛋白原抗体(ACF)的出现预示着关节炎症较抗体阴性的患者将更加严重。纤维蛋白在关节局部的沉积是类风湿关节炎(RA)的病理特点之一,与早期病程的发病机制和病情的严重程度都密切相关。尤其当这些纤维蛋白一旦经瓜氨酸化,即可成为ACPA的自身抗原而进一步触发RA的发生。来自瑞士苏黎世大学实验风湿病学中心的Olga Sanchez-Pernaute等研究者,通过研究瓜氨酸化和非瓜氨酸化的纤维蛋白对类风湿关节炎滑膜成纤维细胞(RASF)的作用和影响,进一步揭示了瓜氨酸化的纤维蛋白在RA发病中所起的作用。研究结果发表在2013年8月的Ann Rheum Dis(《风湿病年鉴》)上。研究者发现,TLR4和PAD在与纤维蛋白相关的促炎作用中起到关键作用,因此临床上对TRL4结合部位和PAD活性的干预有可能成为RA治疗的新方向。【原文下载

研究者发现纤维蛋白作用后的类风湿关节炎滑膜细胞(RASF)表达的各种细胞因子中,炎性因子白介素-6(IL-6)和白介素-8(IL-8)的表达在基因和蛋白水平上均明显升高,且这种作用可能是通过Toll样受体4(TLR4)等途径激活核转录因子κB(NFκB)而促进IL-6和IL-8的释放和白细胞的聚集,从而加重RASF的炎症反应。而肽酰基精氨酸脱亚氨酶(PAD)激活的纤维蛋白的瓜氨酸化会更加加剧上述过程,同时会促进RASF等细胞表达RANKL并增加RASF的侵袭性,而加重骨侵蚀等病理进展。

该研究提示,TLR4和PAD在与纤维蛋白相关的促炎作用中起到关键作用,因此临床上对TRL4结合部位和PAD活性的干预有可能成为RA治疗的新方向。

原文下载

Sanchez-Pernaute O, Filkova M, Gabucio A, Klein M, Maciejewska-Rodrigues H, Ospelt C, Brentano F, Michel BA, Gay RE, Herrero-Beaumont G, Gay S, Neidhart M, Juengel A.Citrullination enhances the pro-inflammatory response to fibrin in rheumatoid arthritis synovial fibroblasts.Ann Rheum Dis. 2013 Aug;72(8):1400-6.

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    2013-09-12 lmm397
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