Signal 3 determines tolerance versus full activation of naive CD8 T cells: dissociating proliferation and development of effector function.

Signal 3 determines tolerance versus full activation of naive CD8 T cells: dissociating proliferation and development of effector function.
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DOI:
10.1084/jem.20021910
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发表时间:
2003-05-05
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Mescher MF
Mescher MF
中科院分区:
其他
文献类型:
--
作者:
Curtsinger JM;Lins DC;Mescher MF

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初始CD8 T细胞的活化以进行克隆扩增并产生效应功能需要三个信号:(a)抗原,(b)共刺激,以及(c)白细胞介素 - 12或佐剂。刺激抗原依赖性增殖所需的第三个信号是可变的,在抗原水平较低时作用最大。在高抗原水平下,在体外或体内没有第三个信号时也可发生广泛增殖。然而,尽管分裂次数相同,但在没有第三个信号的情况下扩增的细胞无法产生细胞溶解效应功能。因此,增殖和细胞溶解功能的发展可以完全分离。此外,这些细胞在体内呈现功能性耐受,即随后用强效刺激物再刺激时,会导致克隆扩增有限、干扰素 - γ产生受损且无细胞溶解功能。因此,第三个信号的存在与否似乎是决定抗原刺激导致耐受还是效应功能发展以及产生有反应性的记忆细胞群的关键变量。
Activation of naive CD8 T cells to undergo clonal expansion and develop effector function requires three signals: (a) Ag, (b) costimulation, and (c) IL-12 or adjuvant. The requirement for the third signal to stimulate Ag-dependent proliferation is variable, making the greatest contribution when Ag levels are low. At high Ag levels, extensive proliferation can occur in vitro or in vivo in the absence of a third signal. However, despite having undergone the same number of divisions, cells that expand in the absence of a third signal fail to develop cytolytic effector function. Thus, proliferation and development of cytolytic function can be fully uncoupled. Furthermore, these cells are rendered functionally tolerant in vivo, in that subsequent restimulation with a potent stimulus results in limited clonal expansion, impaired IFN-γ production, and no cytolytic function. Thus, the presence or absence of the third signal appears to be a critical variable in determining whether stimulation by Ag results in tolerance versus development of effector function and establishment of a responsive memory population.
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