TCR Complex-Activated CD8 Adhesion Function by Human T Cells

被引:3
|
作者
Varghese, Jay C. [1 ]
Kane, Kevin P. [1 ]
机构
[1] Univ Alberta, Heritage Med Res Ctr 6 60, Dept Med Microbiol & Immunol, Edmonton, AB T6G 2S2, Canada
来源
JOURNAL OF IMMUNOLOGY | 2008年 / 181卷 / 09期
基金
加拿大健康研究院;
关键词
D O I
10.4049/jimmunol.181.9.6002
中图分类号
R392 [医学免疫学]; Q939.91 [免疫学];
学科分类号
100102 ;
摘要
The CD8 receptor plays a central role in the recognition and elimination of virally infected and malignant cells by cytolytic CD8(+) T cells. In conjunction with the TCR, the CD8 coreceptor binds Ag-specific class I MHC (MHC-I) molecules expressed by target cells, initiating signaling events that result in T cell activation. Whether CD8 can further function as an adhesion molecule for non-Ag MHC-I is currently unclear in humans. In this study, we show that in human CD8(+) T cells, TCR complex signaling activates CD8 adhesion molecule function, resulting in a CD8 interaction with MHC-I that is sufficient to maintain firm T cell adhesion under shear conditions. Secondly, we found that while CD8 adhesive function was triggered by TCR complex activation in differentiated cells, including in vitro generated CTL and ex vivo effector/memory phenotype CD8(+) T cells, naive CD8(+) T cells were incapable of activated CD8 adhesion. Lastly, we examine the kinetics of, and signaling for, activated CD8 adhesion in humans and identify notable differences from the equivalent CD8 function in mouse. Activated CD8 adhesion induced by TCR signaling may contribute to the more rapid and robust elimination of pathogen-infected cells by differentiated CD8(+) T cells. The Journal of Immunology, 2008, 181: 6002-6009.
引用
收藏
页码:6002 / 6009
页数:8
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