Calprotectin (a Major Leucocyte Protein) is Strongly and Independently Correlated with Joint Inflammation and Damage in Rheumatoid Arthritis

Overview

Journal Ann Rheum Dis

Specialty Rheumatology

Date 2007 Jan 20

PMID 17234650

Citations 52

Authors

Hilde Berner Hammer

Sigrid Odegard

Magne K Fagerhol

Robert Landewe

Desiree van der Heijde

Till Uhlig

Petter Mowinckel

Tore K Kvien

Affiliations

Soon will be listed here.

Abstract

Objective: Calprotectin is a major leucocyte protein, shown to correlate well with laboratory and clinical assessments in several inflammatory rheumatic diseases, and large concentrations of calprotectin have been found in synovial fluid from patients with rheumatoid arthritis (RA). The objective of the present study was to examine correlations between calprotectin and joint damage.

Methods: 145 patients with RA were analysed cross sectionally with laboratory (calprotectin, C reactive protein (CRP), and erythrocyte sedimentation rate (ESR)), clinical (28 joint counts (tender, swollen), physician global VAS, DAS28 and RA Articular Damage score (RAAD)), and radiographic (plain hand radiographs; modified Sharp's method) measurements, on the same day.

Results: Calprotectin showed a highly significant correlation with measures of joint damage; modified Sharp score r = 0.43 (p<0.001) and RAAD r = 0.40 (p<0.001). The association with modified Sharp score and RAAD score was maintained after adjustment for CRP, ESR, rheumatoid factor, DAS28, sex, and age in a multiple regression analysis (p = 0.018 and p = 0.04, respectively), while neither CRP nor ESR showed any independent associations. Highly significant correlations (p<0.001) were also found between calprotectin and both laboratory and clinical markers of inflammation.

Conclusion: Calprotectin was found to significantly and independently explain the variation in the radiological and clinical assessments of joint damage. Longitudinal studies are required to examine whether calprotectin may predict the progression of joint damage in RA.

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