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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Direct stimulation of naive T cells by membrane vesicles from antigen-presenting cells: Distinct roles for CD54 and B7 molecules
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Direct stimulation of naive T cells by membrane vesicles from antigen-presenting cells: Distinct roles for CD54 and B7 molecules

机译:来自抗原呈递细胞的膜囊泡直接刺激幼稚T细胞:CD54和B7分子的独特作用

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摘要

T cell stimulation usually requires direct contact with viable antigen-presenting cells (APCs). However, we show here that small exosome-like membrane vesicles shed from APCs can be recognized by naive CD8(+) T cells in the absence of viable APCs; T cell antigen receptor-dependent binding of vesicles by CD8(+) cells is MHC class I/pepticle-specific and requires that the vesicles coexpress intercellular adhesion molecule 1 (ICAM-1, CD54), although not B7 (B7-1). In the absence of B7, T cell binding of vesicles is nonimmunogenic. By contrast, vesicles expressing both ICAM-1 and B7 are strongly immunogenic and cause purified APC-depleted CD8(+) cells to mount peptide-specific proliferative responses and differentiate into effector cells. [References: 32]
机译:T细胞刺激通常需要与活的抗原呈递细胞(APC)直接接触。然而,我们在这里表明,在没有可行的APC的情况下,幼稚的CD8(+)T细胞可以识别出从APC脱落的小的外泌体样膜囊泡。 CD8(+)细胞对囊泡的T细胞抗原受体依赖性结合是MHC I类/消化器官特异性的,并且要求囊泡共表达细胞间粘附分子1(ICAM-1,CD54),尽管不是B7(B7-1)。在没有B7的情况下,囊泡的T细胞结合是非免疫原性的。相比之下,表达ICAM-1和B7的囊泡具有强烈的免疫原性,并导致纯化的APC耗竭的CD8(+)细胞安装肽特异性增殖反应并分化为效应细胞。 [参考:32]

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