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Predominance of IgG1 and IgG3 subclasses of autoantibodies to peptidylarginine deiminase 4 in rheumatoid arthritis

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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.

Funding

The current study did not receive any external funding.

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Correspondence to Jinming Li.

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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

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