TGF-β in intestinal lymphoid organs contributes to the death of armed effector CD8 T cells and is associated with the absence of virus containment in rhesus macaques infected with the simian immunodeficiency virus

被引:58
作者
Cumont, M. C.
Monceaux, V.
Viollet, L.
Lay, S.
Parker, R.
Hurtrel, B.
Estaquier, J.
机构
[1] Inst Pasteur, Unite Physiopathol Infect Lentivirales, CNRS, URA 1930, F-75724 Paris, France
[2] INSERM, U 841, Paris, France
关键词
AIDS; reservoir; IDO; apoptosis; PD-1; p53;
D O I
10.1038/sj.cdd.4402192
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
SIV-infected macaques exhibit distinct rates of progression to AIDS and despite significant increases in CD8(+) T cells, immune cells fail to control and eradicate SIV in vivo. Here, we investigated the interplay between viral reservoir sites, CD8(+) T-cell activation/death and outcome. Our data provide strong evidence that mesenteric (Mes) lymph nodes represent major reservoirs not only for SIV-infected macaques progressing more rapidly toward AIDS but also in controllers. We demonstrate that macaques progressing faster display greater expression of TGF-beta and Indoleamine 2,3 dioxygenase in particular in intestinal tissues associated with a phosphorylation of the p53 protein on serine 15 in CD8(+) T cells from Mes lymph nodes. These factors may act as a negative regulator of CD8(+) T-cell function by inducing a Bax/Bak/Puma-dependent death pathway of effector/memory CD8(+) T cells. Greater T-cell death and viral dissemination was associated with a low level of TIA-1(+) expressing cells. Finally, we provide evidence that abrogation of TGF-beta in vitro enhances T-cell proliferation and reduces CD8(+) T-cell death. Our data identify a mechanism of T-cell exhaustion in intestinal lymphoid organs and define a potentially effective immunological strategy for the modulation of progression to AIDS.
引用
收藏
页码:1747 / 1758
页数:12
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