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首页> 外文期刊>Nature immunology >Persistent Toll-like receptor signals are required for reversal of regulatory T cell-mediated CD8 tolerance.
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Persistent Toll-like receptor signals are required for reversal of regulatory T cell-mediated CD8 tolerance.

机译:持久的Toll样受体信号是逆转调节性T细胞介导的CD8耐受性所必需的。

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摘要

One chief barrier to cancer immunotherapy is tumor-specific T cell tolerance. Here we compared the ability of hemagglutinin (HA)-encoding recombinant viruses versus 'HA-loaded' dendritic cells to reverse HA-specific CD8 tolerance and to protect mice from tumor challenge. Both vaccines were comparable in activating naive HA-specific CD8(+) T cells. However, in circumstances of established tolerance, viral vaccines could break CD8 tolerance in the presence of CD4(+)CD25(+) regulatory T cells, whereas dendritic cell-based vaccines achieved this only after removal of regulatory T cells or the coadministration of a Toll-like receptor (TLR) ligand or irrelevant virus. These results demonstrate that virus provides TLR signals required for bypassing regulatory T cell-mediated tolerance and emphasize the importance of persistent TLR signals for immunotherapy in the setting of established tolerance.
机译:癌症免疫治疗的主要障碍是肿瘤特异性T细胞耐受性。在这里,我们比较了编码血凝素(HA)的重组病毒与“装有HA”的树突状细胞逆转HA特异性CD8耐受性并保护小鼠免受肿瘤攻击的能力。两种疫苗在激活天然HA特异性CD8(+)T细胞方面具有可比性。但是,在已建立耐受性的情况下,在存在CD4(+)CD25(+)调节性T细胞的情况下,病毒疫苗可能会破坏CD8耐受性,而基于树突细胞的疫苗只有在除去调节性T细胞或联合使用T细胞后才能达到此目的。 Toll样受体(TLR)配体或无关病毒。这些结果表明,病毒提供了绕过调节性T细胞介导的耐受性所需的TLR信号,并强调了持久性TLR信号对于确立耐受性的免疫治疗的重要性。

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