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Arthritis Res Ther. 2016 Dec 12;18(1):290.

Type I interferon response gene expression in established rheumatoid arthritis is not associated with clinical parameters.

Author information

1
Amsterdam Rheumatology and Immunology Center, VU University Medical Center, CCA 2.21, P.O. Box 7075, 1007MB, Amsterdam, The Netherlands. td.dejong@vumc.nl.
2
Department of Pathology, VU University Medical Center, Amsterdam, The Netherlands.
3
Amsterdam Rheumatology and Immunology Center, Reade, Amsterdam, The Netherlands.

Abstract

BACKGROUND:

A peripheral blood interferon (IFN) signature (i.e., elevated type I interferon response gene [IRG] expression) has been described in a subset of patients with rheumatoid arthritis (RA). In the present study, we systematically assessed the association between this IRG expression and clinical parameters.

METHODS:

Expression of 19 IRGs was determined in peripheral blood from 182 consecutive patients with RA and averaged into an IFN score per individual. Correlation and unpaired analyses were performed on the complete patient group. The analyses were internally validated by using an algorithm to randomize the patient group 1000 times into two equally sized sets, and then analyses were performed on both sets.

RESULTS:

Associations were assessed between IFN score and disease duration, 28-joint Disease Activity Score and its components, the occurrence of erosions and nodules, autoantibody positivity, and immunosuppressive treatment. This analysis revealed lower IFN scores in patients using hydroxychloroquine, prednisone, and/or sulfasalazine, but it did not show significant associations between the other parameters and the IFN score. Selecting patients who were not treated with hydroxychloroquine, prednisone, and/or sulfasalazine (n = 95) did not reveal any significant associations either.

CONCLUSIONS:

IRG expression in RA is affected by immunosuppressive treatment with prednisone, hydroxychloroquine, and/or sulfasalazine, but it is not evidently associated with other clinical parameters. Hence, the IFN signature appears to describe a subgroup of patients with RA but does not seem to reflect disease activity.

KEYWORDS:

Gene expression; Rheumatoid arthritis; Type I interferon

PMID:
27955694
PMCID:
PMC5154062
DOI:
10.1186/s13075-016-1191-y
[Indexed for MEDLINE]
Free PMC Article

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