OX40-OX40 ligand interaction through T cell-T cell contact contributes to CD4 T cell longevity

被引:86
|
作者
Soroosh, Pejman [1 ]
Ine, Shouji [1 ]
Sugamura, Kazuo [1 ]
Ishii, Naoto [1 ]
机构
[1] Tohoku Univ, Grad Sch Med, Dept Microbiol & Immunol, Aoba Ku, Sendai, Miyagi 9808575, Japan
来源
JOURNAL OF IMMUNOLOGY | 2006年 / 176卷 / 10期
关键词
D O I
10.4049/jimmunol.176.10.5975
中图分类号
R392 [医学免疫学]; Q939.91 [免疫学];
学科分类号
100102 ;
摘要
Signals through the OX40 costimulatory receptor on naive CD4 T cells are essential for full-fledged CD4 T cell activation and the 14 generation of CD4 memory T cells. Because the ligand for OX40 is mainly expressed by APCs, including activated B cells, dendritic cells, and Langerhans cells, the OX40-OX40 ligand (OX40L) interaction has been thought to participate in T cell-APC interactions tions. Although several reports have revealed the expression of OX40L on T cells, the functional significance of its expression on them is still unclear. In this study, we demonstrate that Ag stimulation induced an increase in the surface expression and transcript levels of OX40L in CD4 T cells. Upon contact with OX40-expressing T cells, the cell surface expression of OX40L on CD4 T cells was markedly down-regulated, suggesting that OX40-OX40L binding occurs through a novel T cell-T cell interaction. To investigate the function of this phenomenon, we examined the proliferative response and survival of OX40L-deficient CD4 T cells when challenged with Ag. In vitro studies demonstrated markedly less CD3-induced proliferation of OX40L-deficient CD4 T cells compared with wild-type CD4 T cells. When using TCR transgenic CD4 T cells upon Ag stimulation, survival of OX40L-deficient T cells was impaired. Furthermore, we show that upon antigenic stimulation, fewer OX40L-deficient CD4 T cells than wild-type cells survived following transfer into wild-type and sublethally irradiated recipient mice. Taken together, our findings indicate that OX40L-expressing T cells have an autonomous machinery that provides OX40 signals through a T cell-T cell circuit, creating an additional mechanism for sustaining CD4 T cell longevity.
引用
收藏
页码:5975 / 5987
页数:13
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