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The relationship between the elevated serum immunoglobulin g4 level and disease activity in patients with rheumatoid arthritis

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Author(s)
Son, C-NJeong, H-JChae, J-NKim, J-MKim, S-H
Keimyung Author(s)
Kim, Sang HyonSon, Chang Nam
Department
Dept. of Internal Medicine (내과학)
Journal Title
Annals of the Rheumatic Diseases
Issued Date
2018
Volume
77
Issue
suppl.2
Abstract
Background: High levels of serum immunoglobulin G4 (IgG4) would comprise a
useful diagnostic tool in IgG4-related disease, but little information is available
about IgG4 in conditions other than IgG4-related disease, including rheumatic diseases.
Previous studies indicate that the elevated serum IgG4 in rheumatoid
arthritis (RA) is common and disproportional to total IgG.
Results: Among 96 RA patients, the mean of serum IgG4 was 48.0±45.4 mg/dL
and 6.3% had elevated serum IgG4. The mean serum IgG4/IgG ratio of RA
patients was 3.5%±2.8% (range 0.2%~16.9%). There was no patient with elevated
serum IgG4 in ankylosing spondylitis, systemic lupus erythematosus, Sjogren’s
syndrome, and inflammatory myositis. When the patients were divided
according to clinical activity, the percentages of the positive serum IgG4 were
25% in active disease group and 4% in low activity group. However, the serum
IgG4 levels of the RA patients with active disease activity were not significantly
higher than those of the RA patients with low disease activity (58.3±44.3 mg/dL
vs. 39.9±30.1 mg/dL). No significant relationship was observed between the ratio
of IgG4/total IgG and disease activity. The IgG4 concentrations and total IgG/IgG4
ratios were similar between RA and the other autoimmune diseases (p>0.05).
Conclusions: Our results showed that elevated serum IgG4 in RA is relatively
common. However the presence of the elevated serum IgG4 was not associated
with disease activity of RA. Further investigations are needed to explore the clinical
significance in a larger study population.
Objectives: The aim of study is to evaluate the level of serum IgG4 and IgG4/total
IgG ratio in patients with RA.
Methods: Ninety-six patients with RA and one hundred and thirty-five non-RA
controls were enrolled between March 2014 and July 2017. All samples were collected
before the treatments. The levels of Serum total IgG and IgG4 were determined
by nephelometric assay. The cut-off value of serum IgG4 was 135 mg/dL.
Data on clinical variables and disease activity markers, such as numbers of tender
and swollen joints, levels of acute phase reactants and disease activity score 28
(DAS28) were recorded in RA patients. We compared the levels of serum IgG4
and the ratio of IgG4/total IgG in rheumatoid arthritis with healthy controls and
other rheumatic diseases. This study also investigated the difference the relationship
between levels of serum IgG4 and disease activity in RA.
Keimyung Author(s)(Kor)
손창남
김상현
Publisher
School of Medicine (의과대학)
Citation
Son, C-N et al. (2018). The relationship between the elevated serum immunoglobulin g4 level and disease activity in patients with rheumatoid arthritis. Annals of the Rheumatic Diseases, 77(suppl.2), 1289–1290. doi: 10.1136/annrheumdis-2018-eular.4599
Type
Article
ISSN
0003-4967
DOI
10.1136/annrheumdis-2018-eular.4599
URI
https://kumel.medlib.dsmc.or.kr/handle/2015.oak/41540
Appears in Collections:
1. School of Medicine (의과대학) > Dept. of Internal Medicine (내과학)
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