Multiple cytokines and chemokines are associated with rheumatoid arthritis-related autoimmunity in first-degree relatives without rheumatoid arthritis: Studies of the Aetiology of Rheumatoid Arthritis (SERA)

• Published in: Annals of the rheumatic diseases Vol. 72; no. 6; pp. 901 - 907
• Main Authors: Hughes-Austin, Jan M, Deane, Kevin D, Derber, Lezlie A, Kolfenbach, Jason R, Zerbe, Gary O, Sokolove, Jeremy, Lahey, Lauren J, Weisman, Michael H, Buckner, Jane H, Mikuls, Ted R, O'Dell, James R, Keating, Richard M, Gregersen, Peter K, Robinson, William H, Holers, V Michael, Norris, Jill M
• Format: Journal Article
• Language: English
• Published: England BMJ Publishing Group Ltd and European League Against Rheumatism 01.06.2013; BMJ Publishing Group LTD
• Subjects: Adult; Aged; Arthritis, Rheumatoid - genetics; Arthritis, Rheumatoid - immunology; Autoantibodies - immunology; Autoimmunity - genetics; Autoimmunity - immunology; Biomarkers; C-Reactive Protein - immunology; Chemokines; Chemokines - immunology; Cohort Studies; Cytokines; Cytokines - immunology; Female; Genetic Predisposition to Disease; Genotype & phenotype; Granulocyte-Macrophage Colony-Stimulating Factor - immunology; Health risk assessment; Humans; Inflammation; Inflammation - immunology; Interferon-gamma - immunology; Interleukin-2 - immunology; Interleukin-6 - immunology; Interleukin-9 - immunology; Logistic Models; Male; Middle Aged; Peptides, Cyclic - immunology; Phenotype; Population; Prospective Studies; Rheumatoid arthritis; Rheumatoid Factor - immunology; Rheumatology; Studies; Tumor necrosis factor-TNF
• ISSN: 0003-4967; 1468-2060
• DOI: 10.1136/annrheumdis-2012-201505

Objective We investigated whether rheumatoid arthritis (RA)-related autoantibodies were associated with systemic inflammation in a prospective cohort of first-degree relatives (FDRs) of RA probands, a population without RA but at increased risk for its future development. Methods We studied 44 autoantibody positive FDRs, of whom 29 were rheumatoid factor (RF) positive, 25 were positive for the high risk autoantibody profile (HRP), that is, positive for anti-cyclic citrullinated peptide and/or for at least two RF IgM, IgG or IgA isotypes, and nine FDRs who were positive for both; and 62 FDRs who were never autoantibody positive. Twenty-five cytokines/chemokines were measured using a bead-based assay in serum. As a comprehensive measure of inflammation, we calculated a Cytokine Score by summing all cytokine/chemokine levels, weighted by their regression coefficients for RA-autoantibody association. We compared C-reactive protein, individual cytokines/chemokines and Cytokine Score to the outcomes: positivity for RF and for the HRP using logistic regression. Results Adjusting for age, sex, ethnicity and ever smoking, the Cytokine Score and levels of IL-6 and IL-9 were associated with both RF and HRP. IL-2, granulocyte macrophage-colony stimulating factor (GM-CSF), and interferon (IFN)-γ were associated with HRP only. Associations between the Cytokine Score and RF and HRP positivity were replicated in an independent military personnel cohort. Conclusions In first-degree relatives of patients with RA, RA-related autoimmunity is associated with inflammation, as evidenced by associations with multiple cytokines and chemokines.