[Changes of CD8+CD28- T cell percentage in patients with multiple injuries and their clinical significance].
OBJECTIVE
To investigate the correlation of the changes in CD8(+)CD28(-) T cell percentage with platelet (PLT) and D-dimer (D-D) levels in patients with multiple injuries (MI).


METHODS
Twenty-six patients with MI, 31 with a single injury (SI group) and 26 healthy individuals were examined for peripheral blood CD8(+)CD28(-) T cells and intracellular transformation growth factor-β1 (TGF-β1) and interleukin 10 (IL-10) contents using flow cytometry at 24, 48, and 72 h after the injuries. PLT and D-dimer levels were compared among the 3 groups.


RESULTS
CD8(+)CD28(-) T cells, TGF-β1 and IL-10 were significantly higher in MI group than in SI group and healthy control group (P<0.05) without significant differences between the latter 2 groups. The levels of PLT and D-D differed significantly among the 3 groups, the highest in MI group and the lowest in the control group. In MI group, CD8(+)CD28(-) T cells, TGF-β1 and IL-10 significantly increased at 48 h after the injury (P<0.05) but decreased significantly at 72 h (P<0.05) compared with the measurements at 24 h. The levels of PLT and D-D trended to decrease with time after the injuries and showed significant differences among the 3 groups at any of the 3 time points (P<0.05). CD8(+)CD28(-) T cells, TGF-β1 and IL-10 were all positively correlated with the levels of PLT and D-D in MI patients (r>0.70, P<0.05 for all comparisons).


CONCLUSIONS
In MI patients, CD8(+)CD28(-) T cell percentage and their cytokines tend to increase early after the injury but decrease significantly at 72 h in close relation with the changes of the coagulation function following the injuries.
Department of Emergency Medicine, Zhongshan People's Hospital, Zhongshan 528403, China. E-mail: 1516963310@qq.com.
Hui-Qiang
HQ
Mai
Jin
J
Xu
Xian-Qi
XQ
Lan
Shu-Xin
SX
Chen
D018106:CD28 Antigens / Q000378:metabolism; D016827:CD8 Antigens / Q000378:metabolism; D016022:Case-Control Studies; D005338:Fibrin Fibrinogen Degradation Products / Q000378:metabolism; D005434:Flow Cytometry; D006801:Humans; D016753:Interleukin-10 / Q000378:metabolism*; D009104:Multiple Trauma / Q000276:immunology*; D016176:T-Lymphocyte Subsets / Q000166:cytology*; D053773:Transforming Growth Factor beta1 / Q000378:metabolism*
D018106:CD28 Antigens; D016827:CD8 Antigens; D005338:Fibrin Fibrinogen Degradation Products; C508609:IL10 protein, human; C508960:TGFB1 protein, human; D053773:Transforming Growth Factor beta1; C036309:fibrin fragment D; D016753:Interleukin-10