Homeostatic division is not necessary for antigen-specific CD4+ memory T cell persistence.

Homeostatic division is not necessary for antigen-specific CD4+ memory T cell persistence.
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DOI:
10.4049/jimmunol.1201583
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发表时间:
2012-10-01
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Maltzman JS
Maltzman JS
中科院分区:
其他
文献类型:
--
作者:
Corbo-Rodgers E;Wiehagen KR;Staub ES;Maltzman JS

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CD4+记忆T细胞是响应感染或疫苗接种而产生的,为宿主提供防止再次感染的保护,并通过增强生存和缓慢稳态周转的结合而持续存在。我们使用 MHC: 肽四聚体定时删除 TCR 信号转导接头分子含 SH2 结构域的 76 kDa 磷蛋白 (SLP-76),以研究维持多克隆抗原特异性 CD4+ 记忆 T 细胞对强直 TCR 信号的需求。 SLP-76 缺陷型 I-Ab:GP61 细胞无法快速产生效应细胞因子或因继发感染而增殖。在感染淋巴细胞性脉络丛脑膜炎病毒 (LCMV) 或表达 LCMV GP61-80 肽的单核细胞增生李斯特氏菌的小鼠中,SLP-76 缺陷的 I-Ab:GP61+ 细胞表现出分裂减少,类似于体外生成的 CD44hi 和内源性 CD4+CD44hi 细胞中所见的情况。竞争性骨髓嵌合体实验表明,在缺乏 SLP-76 的情况下稳态周转率的降低是细胞内在的过程。令人惊讶的是,尽管周转率有所下降,但在缺乏 SLP-76 的情况下,I-Ab:GP61+ 抗原特异性记忆细胞在 LCMV 感染后 30 周以上仍保持正常数量。这些数据表明,在缺乏 SLP-76 和正常水平的稳态分裂的情况下,抗原特异性 CD4+ 记忆 T 细胞群体的独立维持。
CD4+ memory T cells are generated in response to infection or vaccination, provide protection to the host against re-infection, and persist through a combination of enhanced survival and slow homeostatic turnover. We used timed deletion of the TCR-signaling adaptor molecule SH2-domain-containing phosphoprotein of 76 kDa (SLP-76) with MHC:peptide tetramers to study the requirements for tonic TCR signals in the maintenance of polyclonal antigen-specific CD4+ memory T cells. SLP-76 deficient I-Ab:GP61 cells are unable to rapidly generate effector cytokine or proliferate in response to secondary infection. In mice infected with lymphocytic choriomeningitis virus (LCMV) or Listeria monocytogenes expressing the LCMV GP61-80 peptide, SLP-76 deficient I-Ab:GP61+ cells exhibit reduced division, similar to that seen in in vitro generated CD44hi and endogenous CD4+CD44hi cells. Competitive bone marrow chimera experiments demonstrated that the decrease in homeostatic turnover in the absence of SLP-76 is a cell intrinsic process. Surprisingly, despite the reduction in turnover, I-Ab:GP61+ antigen-specific memory cells persist in normal numbers for more than 30 weeks post LCMV infection in the absence of SLP-76. These data suggest the independent maintenance of a population of antigen-specific CD4+ memory T cells in the absence of SLP-76 and normal levels of homeostatic division.
在天真和记忆T细胞的体内稳态中,亲生的涉及主要组织相容性复合物。
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