Memory CD8+ T cells provide innate immune protection against Listeria monocytogenes in the absence of cognate antigen.

Memory CD8+ T cells provide innate immune protection against Listeria monocytogenes in the absence of cognate antigen.
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DOI:
10.1084/jem.20031051
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发表时间:
2003-11-17
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Forman J
Forman J
中科院分区:
其他
文献类型:
--
作者:
Berg RE;Crossley E;Murray S;Forman J

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干扰素(IFN)-γ在针对细胞内细菌病原体的天然免疫应答中起重要作用。通常认为,自然杀伤细胞是这种细胞因子的主要来源,其参与激活感染细胞中的抗菌作用并使CD 4 + T细胞向Th 1亚群极化。然而,在这里,我们表明,效应和记忆CD 8 + T细胞都有潜力分泌IFN-γ响应白细胞介素(IL)-12和IL-18在同源抗原的情况下。我们证明,特异性的卵清蛋白蛋白的记忆CD 8 + T细胞分泌IFN-γ迅速感染野生型单核细胞增生李斯特菌(LM)。此外,少量卵清蛋白特异性记忆性CD 8 + T细胞可以减少LM感染后3天IFN-γ缺陷小鼠的脾脏和肝脏细菌计数。IL-12和IL-18受体的上调为记忆性CD 8 + T细胞以这种抗原非特异性方式应答的能力提供了机制。因此,CD 8 + T细胞通过响应IL-12和IL-18快速分泌IFN-γ,在针对细胞内病原体的先天免疫应答中发挥重要作用。
Interferon (IFN)-γ plays an important role in the innate immune response against intracellular bacterial pathogens. It is commonly thought that natural killer cells are the primary source of this cytokine that is involved in activating antibacterial effects in infected cells and polarizing CD4+ T cells toward the Th1 subset. However, here we show that both effector and memory CD8+ T cells have the potential to secrete IFN-γ in response to interleukin (IL)-12 and IL-18 in the absence of cognate antigen. We demonstrate that memory CD8+ T cells specific for the ovalbumin protein secrete IFN-γ rapidly after infection with wild-type Listeria monocytogenes (LM). Furthermore, small numbers of ovalbumin-specific, memory CD8+ T cells can reduce spleen and liver bacterial counts in IFN-γ–deficient mice 3 d after LM infection. Up-regulation of the receptors for IL-12 and IL-18 provides a mechanism for the ability of memory CD8+ T cells to respond in this antigen nonspecific manner. Thus, CD8+ T cells play an important role in the innate immune response against intracellular pathogens by rapidly secreting IFN-γ in response to IL-12 and IL-18.
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发表时间: 2003-05-05
期刊: The Journal of experimental medicine
影响因子: --
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发表时间: 1995-06-01
影响因子: 3.1
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发表时间: 1995-01-19
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影响因子: 64.8
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