Abstract
Analysis of IgG subclass distribution of antibodies may provide insights into the mechanisms driving antibody production. Here, we have first determined IgG subclass distribution of anti-recombinant peptidylarginine deiminase 4 (anti-hPADI4) antibodies in sera from patients with rheumatoid arthritis (RA). Sera from 103 RA patients were screened to IgG anti-PADI4 using recombinant antigens. For positive samples, the subclass distribution of IgG anti-hPADI4 was determined by means of establishing the equipotency of four HRP-labeled IgG subclass-specific monoclonal antibodies. The subclass profiles were compared among individuals with different disease status. Thirty-three out of 103 RA patients were determined as IgG anti-hPADI4-positive. As expressed by percentage levels to total IgG anti-hPADI4 activity, IgG1 and IgG3 were determined to be the predominant subclasses of anti-hPADI4. Furthermore, distinct subclass distribution patterns were observed in patients with different disease status. The IgG subclass distribution of anti-hPADI4 indicates that a leading T lymphocyte-regulated IgG1 and IgG3 responses may contribute to a better understanding of the role of anti-PADI4 in RA.
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Abbreviations
- Fc:
-
Crystallized fragment
- RA:
-
Rheumatoid arthritis
- PADI4:
-
Peptidylarginine deiminase 4
- IgG:
-
Immunoglobulin G
- ACPA:
-
Anti-citrullinated protein autoantibodies
- anti-hPADI4:
-
Autoantibodies against recombinant PADI4
- DAS28:
-
Disease active score in 28 swollen and 28 tender joints
- DMARDs:
-
Disease-modifying anti-rheumatic drugs
- SLE:
-
Systemic lupus erythematosus
- pSS:
-
Primary Sjögren syndrome
- SSc:
-
Systemic sclerosis
- AU:
-
Arbitrary unit
- HRP:
-
Horseradish peroxidase
- ELISA:
-
Enzyme-linked immunosorbent assay
- PBS:
-
Phosphate-buffered saline
- PBST:
-
PBS with 0.05% Tween-20
- NCS:
-
Newborn calf serum
- RT:
-
Room temperature
- Th1/2:
-
T helper cell 1/2
- Sm:
-
Smith antigen
- U1-RNP:
-
U1 small nuclear ribonucleoprotein
- ADCC:
-
Antibody-dependent cell-mediated cytotoxicity
- RF:
-
Rheumatoid factor
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Acknowledgements
We thank Akari Suzuki (Laboratory for Rheumatic Diseases, SNP Research Centre, Institute of Physical and Chemical Research, Kanagawa, Japan) for offering the PADI4 expression vector.
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The current study did not receive any external funding.
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Wang, W., Li, J. Predominance of IgG1 and IgG3 subclasses of autoantibodies to peptidylarginine deiminase 4 in rheumatoid arthritis. Clin Rheumatol 30, 563–567 (2011). https://doi.org/10.1007/s10067-010-1671-4
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DOI: https://doi.org/10.1007/s10067-010-1671-4