Abstract
Serum concentrations of soluble interleukin-2 receptor (sIL-2R) were measured as a marker of immune activation in a group of 30 patients with Crohn's disease. sIL-2R concentrations were determined by enzyme linked immunosorbent assay during periods of active and inactive disease and correlated with standard parameters of disease activity. Serum concentrations of sIL-2R were significantly raised in patients with active Crohn's disease compared with patients with inactive disease (p less than 0.001) and control subjects. There was a significant correlation between serum sIL-2R concentrations and disease activity as assessed by the Harvey-Bradshaw index (r = 0.42, p less than 0.01), platelet numbers (r = 0.49, p less than 0.01), and orosomucoid (r = 0.47, p less than 0.01), alpha 1 antitrypsin (r = 0.44, p less than 0.01), and C reactive protein concentrations (r = 0.48, p less than 0.001) but not with the erythrocyte sedimentation rate. Measurement of serum sIL-2R concentration is a simple and useful laboratory means of assessing disease activity. Raised concentrations in patients with active Crohn's disease is further evidence for in vivo immune activation occurring in this disease.
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