北京大学学报(医学版) ›› 2019, Vol. 51 ›› Issue (6): 1003-1007. doi: 10.19723/j.issn.1671-167X.2019.06.004

• 论著 • 上一篇    下一篇

抗氨基甲酰化蛋白抗体在类风湿关节炎合并肺间质病变早期诊断中的价值

竺红1,(),赵丽娟2,周艳1,陈瑶2   

  1. 1. 宁夏医科大学总医院风湿免疫科,宁夏银川 750004
    2. 宁夏医科大学临床医学院,宁夏银川 750004
  • 收稿日期:2019-08-26 出版日期:2019-12-18 发布日期:2019-12-19
  • 通讯作者: 竺红 E-mail:nxzhuh@126.com
  • 基金资助:
    宁夏自然科学基金(NZl6160)

Significance of anti-carbamylated protein antibodies in patients with rheumatoid arthritis-associated intersitial lung disease

Hong ZHU1,(),Li-juan ZHAO2,Yan ZHOU1,Yao CHEN2   

  1. 1. Department of Rheumatology, General Hospital of Ningxia Medical University, Yinchuan 750004, China
    2. Department of Clinical Medical College, Ningxia Medical University, Yinchuan, 750004, China
  • Received:2019-08-26 Online:2019-12-18 Published:2019-12-19
  • Contact: Hong ZHU E-mail:nxzhuh@126.com
  • Supported by:
    Supported by Ningxia Natural Science Foundation(NZl6160)

摘要:

目的 探讨抗氨基甲酰化蛋白(carbamylated protein, CarP)抗体在类风湿关节炎(rheumatoid arthritis,RA)合并肺间质病变 (interstitial lung disease,ILD)早期诊断中的价值。方法 选择2017年12月至2019年6月在宁夏医科大学总医院风湿免疫科住院确诊为RA的患者,收集病例资料及血清标本,依据胸部CT检查结果分为RA-ILD组及单纯RA组,采用酶联免疫吸附试验(enzyme linked immunosorbent assay,ELISA)法测定各组血清中抗CarP抗体水平,分析其与RA-ILD的发生及其他实验室指标的相关性。组间计量资料比较采用两独立样本t检验或Mann-Whitney U检验;组间计数资料比较采用卡方检验;采用绘制受试者工作曲线(ROC曲线)确定抗CarP抗体对诊断RA-ILD最佳截断值并分析其诊断效能,相关性分析采用Spearman相关分析。结果 RA-ILD组抗CarP抗体水平为21.14(12.29,29.75), 明显高于单纯RA组的11.00(6.66,19.05),差异有统计学意义(P<0.05)。RA-ILD组抗CarP抗体阳性率(53%)高于单纯RA组(16%),差异有统计学意义(P<0.05);两组间类风湿因子(rheumatoid factor,RF)及抗环瓜氨酸肽(cyclic citrullinated peptide,CCP)抗体水平差异无统计学意义(P>0.05)。RA-ILD组年龄及疾病活动指数(disease activity score 28,DAS28)显著高于单纯RA组,差异有统计学意义(P<0.05)。RA-ILD组男性和吸烟比例高于单纯RA组,但差异无统计学意义(P>0.05)。通过绘制R0C曲线显示抗CarP抗体对RA-ILD诊断的最佳截断值为20.56 U/mL,灵敏度为53.50%,特异度为84.20%,曲线下面积为0.76 ;Spearman相关性分析示RF、年龄与抗CarP抗体呈正相关(r=0.172,P=0.043;r=0.200,P=0.006);抗CarP抗体水平与 DAS28 评分、红细胞沉降率(erythrocyte sedimentation rate,ESR)、C-反应蛋白(C-reactive protein, CRP)、抗CCP抗体、关节肿胀数和关节压痛数均无相关性(P>0.05)。结论 RA-ILD患者中血清抗CarP抗体浓度高于单纯RA患者,提示抗CarP抗体在RA-ILD发生发展中可能具有一定作用。

关键词: 类风湿关节炎, 抗氨基甲酰化蛋白抗体, 肺间质病变

Abstract:

Objective: To evaluate the value of anti-carbamylated protein (CarP) antibody in the diagnosis of rheumatoid arthritis-associated intersitial lung diseas (RA-ILD).Methods: Clinical and laboratory data and serum samples of patients with RA between December 2017 and June 2019 in Department of Rheumatology, General Hospital of Ningxia Medical University were collected. The patients were subclassified as RA-ILD and RA-without ILD based on computed tomography scans of the chest, Enzyme 1inked immunosorbent assay (ELISA) was used to assess anti-CarP antibody in the serum of each group. The occurrence of ILD and other laboratory indexes were analyzed. Comparison of measurement data between the 2 groups was performed by two independent sample t-test or Mann-Whitney U nonparametric test, while the count data were compared by Chi square test; Receiver operating characteristic curve (ROC) was drawn to determine the cut-off value of anti-CarP antibody to RA-ILD diagnosis and to analyze its diagnostic efficacy.Results: The anti-CarP antibody level in the RA-ILD group was 21.14 (12.29, 29.75), which was significantly higher than that in the RA-without ILD group 11.6 (6.66, 19.05) (P=0.000). The difference was statistically significant (P<0.05). The positive rate of anti-CarP antibody in RA-ILD group (53%) was significantly higher than that in RA-without ILD group (16%) (P<0.05); There was no significant differences in the levels of rheumatoid factor (RF) and anti-cyclic citrullinated peptide (CCP) between the two groups (P>0.05). The age and disease activity score (DAS28) in the RA-ILD group were significantly higher than those in the RA-withhout ILD group (P<0.05). The proportion of men and smoking in the RA-ILD group was higher than that in the RA-without ILD group, but the difference was not statistically significant. The ROC curve showed that the anti-CarP antibody had a cut off value of 20.56 U/mL, with the sensitivity of 53.50%, and specificity of 84.20%, the area under the ROC curve were 0.76. Spearman correlation analysis showed that rheumatoid factor (RF) and age were positively correlated with anti-CarP antibody (r=0.172, P=0.043; r=0.200, P=0.006). Anti-CarP antibody level was not associated with the DAS28 score, erythrocyte sedimentation rate (ESR), C-reactive protein (CRP), anti-CCP antibody, swollen joint count, and tender joint count (P>0.05).Conclusion: The anti-CarP antibody level in RA-ILD patients is higher than that in RA-without ILD, suggesting that anti-CarP antibody may have a role in the development of RA-ILD.

Key words: Rheumatoid arthritis, Anti-carbamylated protein antibody, Intersitial lung disease

中图分类号: 

  • R593.22

表1

两组患者一般资料比较"

Group Total cases Age/years, x?±s Course of disease, M(P25,P75) DAS28, x?±s Gender Smoking
Male % Cases %
RA-ILD 129 60±10 6 (2,12) 5.7±1.2 29 22 14 11
RA-without ILD 57 48±13 6 (2,10) 5.0±1.3 7 12 4 7
t/U/χ2 6.913 3 585 3.948 2.635 0.665
P 0.000 0.786 0.000 0.105 0.415

表2

两组血清抗CarP抗体、RF及抗CCP抗体水平比较[M(P25,P75)]"

Group Cases Anti-CarP/(U/mL) RF/(U/mL) Anti-CCP/(U/mL)
RA-ILD 129 21.14(12.29,29.75) 102.00(12.50,256.50) 71.35(8.95,200)
RA-without ILD 57 11.00(6.66,19.05) 70.70(21.13,223.75) 68.35(7.00,139.80)
U 1 803 3 668 3 273
P 0 0.98 0.346

图1

抗CarP抗体用于RA-ILD诊断的ROC曲线"

表3

抗CarP抗体与RA病情活动相关性分析"

Items Anti-CarP
r P
DAS28 0.029 0.691
ESR 0.05 0.941
CRP 0.35 0.632
RF 0.172 0.043
Anti-CCP -0.039 0.598
Age 0.2 0.006
Swollen joint count -0.084 0.254
Tender joint count 0.06 0.417
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