Measurement of Serum IgG4 Levels by an Established ELISA System and Its Clinical Applications in Autoimmune Diseases

作     者：孙玮 高荣芬 陈雨 苏玉莹 董凌莉 

作者机构：Department of StomatologyUnion HospitalHuazhong University of Science and Technology Department of RheumatologyTongji HospitalHuazhong University of Science and Technology 

出 版 物：《Journal of Huazhong University of Science and Technology(Medical Sciences)》 (华中科技大学学报（医学英德文版）)

年 卷 期：2013年第33卷第4期

页      面：611-614页

核心收录：

学科分类：1010[医学-医学技术（可授医学、理学学位）] 10[医学] 

基　　金：supported by the National Natural Science Foundation of China(Nos.30972706 and 31270965) 

主　　题：IgG4-related disease IgG4 enzyme-linked immunosorbent assay autoimmune disease 

摘      要：Summary： IgG4-related disease （IgG4-RD） is a novel and rare autoimmune disease entity. Elevated serum IgG4 level is strongly suggestive of IgG4-RD. But it is still unknown whether serum IgG4 eleva tion commonly occurs in other autoimmune diseases. In this study, the serum IgG4 levels were detected by an established enzyme-linked immunosorbent assay （ELISA） in a variety of autoimmune diseases including systemic lupus erythematosus （SLE）, Sjogren＇s syndrome （SS）, polymyositis or dermatomy- ositis （PM/DM） and IgG4-RD. To evaluate the reliability of this ELISA system, some of our samples were sent to a lab in Kanazawa Medical University, Japan, and detected by using the nephelometric as-say. The results showed that our findings were consistent with theirs. Moreover, it was found that the serum IgG4 levels were 0.23±0.16 g/L in 53 healthy controls, 0.16±0.15 g/L in 103 SLE patients, 0.22±0.18 g/L in 41 SS patients and 0.40±0.32 g/L in 21 PM/DM patients. No significant difference in the serum IgG4 level was observed among these groups （P〉0.05）. The serum IgG4 levels of two cases of IgG4-RD were 1.63 and 4.65 g/L respectively, and both decreased markedly after treatment with glucocorticoids. These data indicated that this established ELISA system can be used for detecting serum IgG4 levels. Elevated serum IgG4 levels help diagnose IgG4-RD and evaluate the curative effect of this condition rather than other autoimmune diseases.