Cytokine-induced apoptosis of human natural killer cells identifies a novel mechanism to regulate the innate immune response

被引:131
作者
Ross, ME
Caligiuri, MA
机构
[1] ROSWELL PK CANC INST,DIV MED,DEPT HEMATOL ONCOL & BONE MARROW TRANSPLANTAT,BUFFALO,NY 14263
[2] ROSWELL PK CANC INST,DEPT MOL MED,BUFFALO,NY 14263
[3] ROSWELL PK CANC INST,DEPT MOL IMMUNOL,BUFFALO,NY 14263
关键词
D O I
10.1182/blood.V89.3.910
中图分类号
R5 [内科学];
学科分类号
1002 ; 100201 ;
摘要
Interferon-gamma (IFN-gamma) is critical for an effective innate immune response against infection. A combination of interleukins (ILs) derived from activated T cells (IL-2) and monocytes (IL-12). or monocytes alone (IL-15 and IL-12), induces optimal production of IFN-gamma from natural killer (NK) cells. The mechanism by which human NK cells downregulate their production of IFN-gamma is unknown. Here we show that the same cytokines that induce human NK cell IFN-gamma production subsequently induce apoptosis of the NK cells. Fas, bcl-2, or bar do not appear to be involved in this process. The mechanism of cytokine-induced apoptosis of human NK cells appears to involve NK cell production of tumor necrosis factor-alpha (TNF-alpha). Neutralization of TNF-alpha or inhibition of TNF-alpha binding to the p80 TNF-alpha receptor partially inhibited apoptosis. Transforming growth factor-beta, which inhibits cytokine-induced NK cell production of IFN-gamma and TNF-alpha, also decreased cytokine-induced NK cell apoptosis. Costimulation of a CD3(-)CD56(+) NK leukemia cell line with IL-2 and IL-12 or IL-15 and IL-12 induced apoptosis in vitro, which increased when combined with a chemotherapeutic agent. in summary, costimulation of human NK cells via the IL-2 receptor and the IL-12 receptor induces significant IFN-gamma production, followed by NK cell apoptosis and a decline in IFN-gamma production. Hence, cytokines that activate this innate immune response may also serve to limit it via apoptosis. This novel observation may have implications for the regulation of the innate immune response during infection, the toxicity of combination cytokine therapy, and the treatment of NK cell leukemia. (C) 1997 by The American Society of Hematology.
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收藏
页码:910 / 918
页数:9
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