抗突变型瓜氨酸波形蛋白抗体在类风湿关节炎中的诊断价值

目的 通过与类风湿因子(RF)、抗环瓜氨酸肽(CCP)抗体的比较,探讨抗突变型瓜氨酸波形蛋白(MCV)抗体对类风湿关节炎(RA)的诊断价值,方法采用酶联免疫吸附试验(ELISA)定量检测177例RA患者、46例其他风湿性疾病患者及48名健康对照者血清中抗MCV水平,并同时测定血清中抗CCP抗体、RF水平.采用t检验和χ2检验.结果 抗MCV抗体在RA组、疾病对照组及健康对照组的抗体平均滴度依次为(523±376)、(96±55)、(34±18)U/ml;此外,通过ROC曲线计算曲线下面积来确定最佳阳性阈值(分别以20、40、60、80、100、120、140 U/ml),结果为0.521、0.706、0.769、0.791、0.816、0.826、0.822.其中以抗MCV抗体≥120 U/ml为阳性阈值临床诊断效能最大.所以本研究以抗MCV抗体≥120U/ml为阳性阈值,对RA诊断的敏感性为78.0%,特异性为87.2%,阳件预测值及阴性预测值分别为92.0%和67.8%;抗MCV抗体对RA诊断的特异性与抗CCP抗体相当,但敏感性高于抗CCP抗体;与RF相比较,抗MCV抗体的敏感性和特异性均高于前者.抗MCV抗体联合抗CCP抗体或RF或三者联合检测对诊断RA的特异性提高到95.7%;此外,67例抗CCP抗体阴性的RA患者中有32例抗MCV抗体阳性,占55.2%,59例RF阴性的RA患者中有31例抗MCV抗体阳性,占52.5%.结论 抗MCV抗体可以作为RA的临床诊断血清学指标之一,与抗CCP抗体、RF联合柃测可提高对RA诊断的特异性.

Value of anti-mutated citrullinated vimentin antibodies in diagnosing rheumatoid arthritis

Objective To assess the diagnostic value of anti-mutated citrullinated vimentin antibodies (anti-MCV) for rheumatoid arthritis (RA), and compare it with anti-cyclic citrullinated peptide antibodies (anti-CCP), rheumatoid factors (RF). Methods Commercially available enzyme-linked immunosorbent assay (ELISA) kit was used to detect anti-MCV antibodies in a group of 177 RA patients, 46 patients with other rheumatic diseases, and 48 healthy blood donors. At the same time, anti-CCP, RF were detected. T test and χ2 test were selected. Results The average concentration of anti-MCV was (523±376) U/ml in RA, (96± 55) U/ml in patients with other rheumatic diseases, (34±18) U/ml in healthy controls. Different threshold levels (20, 40, 60, 80, 100, 120, 140 U/ml) for positive results were calculated bythe areas under the ROC curve (the areas were 0.521, 0.706, 0.769, 0.791, 0.816, 0.826, 0.822), then the best diagnosis efficacy for RA was determined as more than 120 U/ml. At this level, the sensitivity and the specificity for anti-MCV were 80.1% and 80.9% for RA diagnosis. The positive and negative predictive value were 92% and 67.8%. Comparing with anti-CCP, anti-MCV showed comparable specificity but higher sensitivity. And it's also better than RF apparently. If all 3 antibodies were detected at the same time, or anti-MCV combine with one of them, the sensitivity would increase to 95.7%. In addition, Anti-MCV showed positive in 32 of 67(55.2%) patients with RA whose anti-CCP was negative, meanwhile 31 of 59 (52.5%) patients with RA whose RF was negative. Conclusion RF and anti-CCP are complementary in diagnosing RA. The combination detection of RF and anti-CCP could significantly improve the specificity for the diagnosis of RA.