Timing of Elevations of Autoantibody Isotypes Prior to Diagnosis of Rheumatoid Arthritis

Objective To evaluate patterns of elevations of isotypes of rheumatoid factor (RF) and anti–citrullinated protein antibodies (ACPAs) pre–rheumatoid arthritis (RA) diagnosis and post–RA diagnosis. Methods Using the Department of Defense Serum Repository we identified 214 RA cases and 210 matched cont...

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Bibliographic Details
Published in:Arthritis & rheumatology (Hoboken, N.J.) N.J.), 2020-02, Vol.72 (2), p.251-261
Main Authors: Kelmenson, Lindsay B., Wagner, Brandie D., McNair, Bryan K., Frazer‐Abel, Ashley, Demoruelle, M. Kristen, Bergstedt, Dylan T., Feser, Marie L., Moss, Laura K., Parish, Mark C., Mewshaw, Elizabeth A., Mikuls, Ted R., Edison, Jess D., Holers, V. Michael, Deane, Kevin D.
Format: Article
Language:English
Subjects:
Adult
Anti-Citrullinated Protein Antibodies - blood
Antibodies
Arthritis
Arthritis, Rheumatoid - blood
Arthritis, Rheumatoid - diagnosis
Autoantibodies
Citrulline
Diagnosis
Female
Humans
Identification methods
Immunoglobulin A
Immunoglobulin G
Immunoglobulin M
Isotypes
Lung diseases
Male
Middle Aged
Mucosa
Phenotypes
Rheumatoid arthritis
Rheumatoid factor
Rheumatoid Factor - blood
Signs and symptoms
Time Factors
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Summary:Objective To evaluate patterns of elevations of isotypes of rheumatoid factor (RF) and anti–citrullinated protein antibodies (ACPAs) pre–rheumatoid arthritis (RA) diagnosis and post–RA diagnosis. Methods Using the Department of Defense Serum Repository we identified 214 RA cases and 210 matched controls. Up to 3 pre–RA diagnosis and 1 post–RA diagnosis serum samples per subject were tested for RF and for IgA, IgG, and IgM ACPAs. The timing and trajectories of elevations of autoantibodies were evaluated. Results Autoantibody levels were elevated in cases versus controls a mean of 17.9 years before RA diagnosis for IgG ACPA, 14.2 years for IgA‐RF, 7.2 years for IgM‐RF, 6.2 years for IgA ACPA, and 5.0 years for both IgM ACPA and IgG‐RF (P < 0.01 for all comparisons). There were similar relationships for positive or negative autoantibody status, with cases first showing positivity for IgG ACPA 1.9 years pre‐RA and for IgA‐RF 1.7 years pre‐RA, followed by the other isotypes. Only IgA ACPA positivity was significantly increased in post–RA diagnosis samples (19% 0–2 years pre‐RA versus 39% >2 years post–RA diagnosis; P = 0.04). All autoantibody levels demonstrated an early initial elevation, a period of stability, then an increase immediately before RA diagnosis. A pre‐RA endotype of early elevation of autoantibodies was associated with increased use of biologic therapy, and a higher prevalence of sicca symptoms and lung disease post–RA diagnosis. Conclusion Differences in patterns of elevations of autoantibody isotypes have implications for understanding the pathophysiology of RA development. These include understanding what factors drive initial autoantibody elevations compared to what factors (including mucosal) drive later increases in autoantibody levels and a transition to clinically apparent RA, and how pre‐RA endotypes may influence post–RA diagnosis phenotypes.
ISSN:2326-5191
2326-5205
DOI:10.1002/art.41091