Objective To elucidate the clinical significance of macrophage migration inhibitory factor (MIF) serum concentration in patients with polymyositis. Methods Thirty-six patients with polymyositis were enrolled. Serum samples were obtained and stored to detect MIF and interleukin (IL)-6 using commercially available enzyme-linked immunosorbent assay kits. The relationships between these cytokines and clinical data were analyzed. Results The serum MIF concentration was significantly lower in patients in remission (34.74 ± 17.75) and in healthy controls (38.87 ± 9.30 ng/ml) than that in patients with active polymyositis (50.04 ± 23.84 ng/ml). There were no significant differences between healthy controls and patients in remission. The serum IL-6 concentration in patients with active polymyositis (19.67 ± 7.16 pg/ml) was significantly higher than that in patients in remission (15.81 ± 4.00 pg/ml) and controls (8.14 ± 3.71 pg/ml). The serum IL-6 concentration was negatively correlated with the serum MIF concentration (r = -0.283). No relationship was found between the serum MIF concentration and glucocorticoid dose. The MIF concentration peaked twice during treatment when the creatine kinase concentration was decreasing. Conclusion MIF and IL-6 play important roles in the inflammation associated with polymyositis. MIF might also be involved in the early stage of regeneration in polymyositis. MIF may thus serve as a biomarker of disease activity and outcome.
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| http://dx.doi.org/10.1177/0300060517726194 | DOI Listing |
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