Efficient cross-priming of antiviral CD8+ T cells by antigen donor cells is GRP94 independent.

Efficient cross-priming of antiviral CD8+ T cells by antigen donor cells is GRP94 independent.
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DOI:
10.4049/jimmunol.0901828
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发表时间:
2009-10-01
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Yewdell JW
Yewdell JW
中科院分区:
其他
文献类型:
--
作者:
Lev A;Dimberu P;Das SR;Maynard JC;Nicchitta CV;Bennink JR;Yewdell JW

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交叉致敏(Cross-priming),即由树突状细胞呈递由其他细胞合成的Ag来激活初始CD 8 + T细胞,被认为在产生抗病毒和抗肿瘤应答中起重要作用。交叉启动的分子机制仍然定义不清,争议很大。GRP 94(gp 96)是一种丰富的内质网伴侣蛋白,具有先天免疫激活能力,已被广泛报道在交叉启动中发挥重要作用。在这项研究中,我们表明,通过瞬时或稳定转染GRP 94定向小干扰RNA沉默GRP 94表达的细胞在培养细胞中产生I类肽复合物或体内引发抗病毒CD 8 + T细胞应答的能力没有降低。在证明GRP 94的可分配性时,我们的发现指出了从内源性和外源性Ags和免疫原产生I类肽复合物的替代机制的重要性。
Cross-priming, the activation of naive CD8+ T cells by dendritic cells presenting Ags synthesized by other cells, is believed to play an important role in the generation of antiviral and antitumor responses. The molecular mechanism(s) underlying cross-priming remain poorly defined and highly controversial. GRP94 (gp96), an abundant endoplasmic reticulum chaperone with innate immune-activating capacity, has been widely reported to play a major role in cross-priming. In this study, we show that cells whose expression of GRP94 is silenced via transient or stable transfection with GRP94-directed small interfering RNAs demonstrate no reduction in their abilities to generate class I peptide complexes in cultured cells or to prime antiviral CD8+ T cell responses in vivo. In demonstrating the dispensability of GRP94, our finding points to the importance of alternative mechanisms for generation of class I peptide complexes from endogenous and exogenous Ags and immunogens.
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