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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Memory T-lymphocyte Survival Does Not Require T-cell Receptor Expression
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Memory T-lymphocyte Survival Does Not Require T-cell Receptor Expression

机译:记忆T淋巴细胞生存不需要T细胞受体表达

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摘要

The factors controlling memory T (Tm)-cell longevity are still poorly defined, and their identification is pivotal to the design of a vaccine conferring long-term protection against infection. Tm cells have the ability to survive in the absence of the T-cell receptor (TCR)-MHC interaction. This does not exclude a possible role for TCR-intrinsic ligand-independent constitutive signaling in Tm-cell ho-meostasis. Using a unique TCR tetracycline-inducible expression system, we show that the ablation of TCR expression, which abrogates any possible signaling via the TCR, did not influence the survival and self-renewal of antigen-specific CD8~+ Tm cells even when they have to compete with endogenous T cells for survival factors. Moreover, CD8~+ Tm-cell functionality was not altered even on prolonged maintenance in the absence of TCR-MHC interactions. Furthermore, our results show that a subset of CD4~+ Tm cells can survive in the absence of TCR expression in nonlymphopenic hosts.
机译:控制记忆T(Tm)细胞寿命的因素仍然定义不清,它们的识别对于疫苗的设计具有关键意义,该疫苗可以长期保护免受感染。 Tm细胞具有在没有T细胞受体(TCR)-MHC相互作用的情况下生存的能力。这不排除在Tm细胞全稳态中TCR固有的非配体依赖性本构信号的可能作用。我们使用独特的TCR四环素诱导表达系统,表明消融TCR表达(消灭任何可能通过TCR传递的信号)不会影响抗原特异性CD8〜+ Tm细胞的存活和自我更新,即使它们具有与内源性T细胞竞争生存因子。而且,即使在没有TCR-MHC相互作用的情况下长时间维护,CD8 + Tm细胞功能也不会改变。此外,我们的结果表明,在非淋巴细胞减少的宿主中,CD4〜+ Tm细胞的一部分可以在没有TCR表达的情况下存活。

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