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抗α―胞衬蛋白抗体对原发性干燥综合征的诊断价值

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[摘 要] 目的:分析抗α-胞衬蛋白(α-Fodrin)抗体原发性干燥综合征(Primary Sj?gren syndrom,pSS)的诊断价值。方法:选取我院2012年9月―2015年9月收治的89例pSS患者,并选取同期45例继发性干燥综合征(Secondary SS,sSS)患者、91例系统性红斑狼疮(Systemic lupus erythematosus,SLE)患者、154例类风湿性关节炎(Rheumatoid arthritis,RA)患者及100例健康体检者,使用酶联免疫吸附(ELISA)法对其血清抗α-Fodrin IgA、IgG抗体进行定量检测,均以检测结果>15 U/mL为阳性标准,比较各组受试者血清α-Fodrin IgA、IgG抗体阳性率,并计算抗α-Fodrin抗体对pSS诊断的灵敏度、特异性,分析其诊断价值。结果:pSS组抗α-Fodrin IgA、IgG抗体阳性率均显著高于其他各组,sSS组抗α-Fodrin IgA、IgG抗体阳性率均显著高于SLE组、RA组及对照组,差异有统计学意义(P

[关键词] 抗α-胞衬蛋白抗体;原发性干燥综合征;诊断

中图分类号:R392 文献标识码:B 文章编号:2095-5200(2016)05-084-03

[Abstract] Objective: To analyze the diagnostic value of anti-alpha-fodrin (α-fodrin) antibodies in primary Sj?gren’s syndrome (pSS). Methods: 89 cases of pSS patients in our hospital from September 2012 to September 2015 were selected, and 45 cases of secondary Sjogren syndrome (secondary SS, sSS), 91 cases of patients with systemic lupus erythematosus (SLE), 154 cases of patients with rheumatoid arthritis (RA) and 100 healthy subjects during the same period were also included. Using enzyme-linked immunosorbent assay (ELISA) on the quantitative detection of serum anti-alpha-fodrin IgG and IgA antibodies, with the detection result of >15 U/mL as positive standard, compare the positive rate of serum anti-alpha-fodrin IgG and IgA antibodies in each group of subjects, and calculate and analyze the sensitivity and specificity of anti-alpha-fodrin antibodies on the diagnosis of pSS. Results: Positive rates of anti-alpha-fodrin IgG and IgA antibodies in pSS group were significantly higher than those in the other groups. Positive rates of anti-alpha-fodrin IgG and IgA antibodies in sSS group were significantly higher than those in SLE group, RA group and control group, the differences were statistically significant (P

Chin等[14]研究发现,传统抗SSA抗体、抗SSB抗体在pSS的诊断中灵敏度仅为30%左右,特异性亦不足90%,较抗α-Fodrin抗体的诊断价值存在较大差距。但我们认为,虽然抗α-Fodrin抗体特异性较高,但仍存在一定局限性,故不能作为诊断pSS的主要指标,亦无法取代其他抗体在pSS诊断中的地位,因此,在今后的pSS临床诊断中,可在传统抗体检测的基础上联合抗α-Fodrin抗体检测,以在一定程度上提高诊断的效果。此外,Kim等[15]指出,由于α-Fodrin在pSS的发生发展过程中发挥了重要作用,且pSS患者组织损伤过程中均伴有IgA循环免疫复合物的参与,因此,根据血清抗α-Fodrin抗体定量检测结果亦有可能明确患者疾病活动度,指导治疗方案的制定与实施,且以抗α-Fodrin靶向治疗有望改善pSS患者预后质量。关于该方面研究,我们将在日后的工作中加以补充。

总体而言,抗α-Fodrin抗体在pSS的诊断中具有较高的特异性,但灵敏度有限,故抗α-Fodrin抗体仅可作为pSS的辅助诊断指标用于临床联合诊断,对于抗α-Fodrin抗体阳性患者,应高度怀疑pSS风险,但抗α-Fodrin抗体阴性患者仍不能被排除pSS,建议行唇腺活检。

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