PD-1 is a regulator of virus-specific CD8+ T cell survival in HIV infection.

PD-1 is a regulator of virus-specific CD8+ T cell survival in HIV infection.
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DOI:
10.1084/jem.20061496
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发表时间:
2006-10-02
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Koup RA
Koup RA
中科院分区:
其他
文献类型:
--
作者:
Petrovas C;Casazza JP;Brenchley JM;Price DA;Gostick E;Adams WC;Precopio ML;Schacker T;Roederer M;Douek DC;Koup RA

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在这里,我们报告了程序性死亡(PD)-1在人病毒特异性CD 8 + T细胞上的表达,以及通过PD-1操纵信号对这些细胞的存活、增殖和细胞因子功能的影响。根据抗原特异性,发现PD-1表达在初始CD 8 + T细胞上较低,而在记忆CD 8 + T细胞上增加。对控制不良的慢性持久性病毒(HIV)特异性的记忆CD 8 + T细胞比对控制良好的持久性病毒(巨细胞病毒)或急性(牛痘)病毒特异性的记忆CD 8 + T细胞更频繁地表达PD-1。PD-1表达与记忆性CD 8 + T细胞上的成熟标志物无关,并且与不能产生细胞因子没有直接关系。重要的是,PD-1表面表达水平是病毒特异性CD 8 + T细胞凋亡敏感性的主要决定因素。PD-1的操作导致细胞存活和扩增能力的变化,这在几天内影响了表达细胞因子的细胞数量。因此,PD-1是细胞凋亡的主要调节因子,可以影响慢性感染(如HIV)中抗病毒T细胞的频率,并且可以被操纵以改善HIV特异性CD 8 + T细胞数量,但可能不是体内的所有功能。
Here, we report on the expression of programmed death (PD)-1 on human virus-specific CD8+ T cells and the effect of manipulating signaling through PD-1 on the survival, proliferation, and cytokine function of these cells. PD-1 expression was found to be low on naive CD8+ T cells and increased on memory CD8+ T cells according to antigen specificity. Memory CD8+ T cells specific for poorly controlled chronic persistent virus (HIV) more frequently expressed PD-1 than memory CD8+ T cells specific for well-controlled persistent virus (cytomegalovirus) or acute (vaccinia) viruses. PD-1 expression was independent of maturational markers on memory CD8+ T cells and was not directly associated with an inability to produce cytokines. Importantly, the level of PD-1 surface expression was the primary determinant of apoptosis sensitivity of virus-specific CD8+ T cells. Manipulation of PD-1 led to changes in the ability of the cells to survive and expand, which, over several days, affected the number of cells expressing cytokines. Therefore, PD-1 is a major regulator of apoptosis that can impact the frequency of antiviral T cells in chronic infections such as HIV, and could be manipulated to improve HIV-specific CD8+ T cell numbers, but possibly not all functions in vivo.
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