A role for CD1d-restricted NKT cells in injury-associated T cell suppression

被引:42
作者
Faunce, DE
Gamelli, RL
Choudhry, MA
Kovacs, EJ
机构
[1] Loyola Univ, Ctr Med, Dept Surg, Burn & Shock Trauma Inst, Maywood, IL 60153 USA
[2] Loyola Univ, Ctr Med, Dept Cell Biol Neurobiol & Anat, Maywood, IL 60153 USA
关键词
natural killer T cells; burns; immune suppression;
D O I
10.1189/jlb.1102540
中图分类号
Q2 [细胞生物学];
学科分类号
071009 [细胞生物学]; 090102 [作物遗传育种];
摘要
Natural killer T (NKT) cells are known to modulate T cell responses during autoimmunity, tolerance, and antitumor immunity; however, their potential role in regulating the immune response to injury has not been reported. Using a murine model of burn injury, we investigated whether CD1d-restricted NKT cells played a role in the T cell suppression that occurs early after injury. A functional role for CD1d stimulation of NKT cells in the injury-related immune suppression was demonstrated by experiments in which the suppression of antigen (Ag)-specific delayed-type hypersensitivity and in vitro T cell-proliferative responses were prevented if mice were given anti-CD1d monoclonal antibody (mAb) systemically just before injury. The CD1d-NKT cell-dependent suppression of the T cell response after injury occurred in the absence of quantitative changes in NKT cells themselves or CD1d(+) Ag-presenting cells. We observed that elevated production of the immunosuppressive cytokine interleukin (IL)-4 correlated with burn-induced immune dysfunction, and we found that NKT cells but not conventional T cells were the source of IL-4 early after injury. Lastly, we observed that the injury-induced production of NKT cell-derived IL-4 could be blocked by systemic treatment of burn-injured mice with anti-CD1d mAb. Together, our results reveal a novel mechanism involving CD1d stimulation of NKT cells in the onset of T cell suppression that occurs subsequent to injury.
引用
收藏
页码:747 / 755
页数:9
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