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Severe thermal injury causes an immune dysfunction which includes a decrease of monocyte human leukocyte antigen DR (HLA-DR) expression. Interleukin-10 exerts a negative influence on this parameter  in vitro . In this study we determined the prognostic value of reduced monocyte HLA-DR expression with regard to infectious complications, and the  in vivo  association between monocyte HLA-DR and plasma interleukin-10 concentration. Both quantities were measured serially in 19 patients with severe burns. HLA-DR expression was determined by direct immunofluorescence on a flow cytometer, and interleukin-10 was measured by ELISA. After burn trauma the percentage of HLA-DR expressing monocytes fell markedly (median: 53 % at day 2, 36 % at day 4, 31 % at day 7, 28 % at day 9, 35 % at day 12, and 42 % at day 14; compared to 93 % for healthy volunteers). Moreover, patients who became septic showed lower monocyte HLA-DR expression than non-septic patients; the differences were significant at day 2 (p &lt; 0.01) and day 7 (p &lt; 0.05). Plasma concentrations of interleukin-10 increased after thermal injury (median: 40 ng/l at day 2, 43 ng/l at day 4, 77 ng/l at day 7, 120 ng/l at day 9, 63 ng/l at day 12, and 82 ng/l at day 14). Individual HLA-DR expression and interleukin-10 concentration were negatively correlated, the association reaching statistical significance at day 4 (p = 0.006) and day 7 (p = 0.031). Thus, after severe burn injury monocyte HLA-DR expression has prognostic value and is negatively associated with interleukin-10 plasma concentration.

clinical chemistry and laboratory medicine

Association between Reduced Human Leukocyte Antigen (HLA)-DR Expression on Blood Monocytes and Increased Plasma Level of Interleukin-10 in Patients with Severe Burns