ABSTRACT
Objective To explore the quantity change and significance of CD14-/CD11b+/CD33 + myeloid-derived suppressor cells (MDSCs) in patients with multiple injury. Methods Thirtyfour patients with multiple injury and seven healthy volunteers were enrolled in this study. Peripheral blood was collected and the factors of CD14-/CD1 1 b+/ CD33 + were taken as markers of MDSCs. The percentage of MDSCs was determined by flow cytometry (FCM) and serum interleukin-10 and C-reactive protein levels were determined by ELISA to analyze the quantity change and clinical significance of MDSCs. Results The percentage of MDSCs in peripheral blood of healthy volunteers was (1.13 +0. 25) %. At days 1,2, 3 and 7 after injury, the percentage of MDSCs in peripheral blood were (1.20 +0.22) %, (6.44 + 0.35) %, (13.84 ± 2.07) % and (15.60 ± 1.63) % respectively in patients with infection and multiple injury, whereas (1.29 ±0. 30)%, (4.93 +0. 32)%, (5.15 ±0. 21)% and (3.77 ± 0.34) % respectively in patients without infection. The percentages of MDSCs in two groups showed significant differences at days 2, 3 and 7 after trauma (P＜0.05). No correlation was found between MDSCs percentage in peripheral blood and injury severity score, serum interleukin-10 or C reactive protein in patients with multiple injury (P ＞ 0.05). Conclusions The increase of proportion ofMDSCs in peripheral blood correlates with the onset of infection in patients with multiple injury, indicating that the expansion of MDSCs in peripheral blood may play important roles in immune dysfunction after multiple injury.