DNAM-1 promotes activation of cytotoxic lymphocytes by nonprofessional antigen-presenting cells and tumors.

DNAM-1 promotes activation of cytotoxic lymphocytes by nonprofessional antigen-presenting cells and tumors.
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DOI:
10.1084/jem.20081752
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发表时间:
2008-12-22
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Colonna M
Colonna M
中科院分区:
其他
文献类型:
--
作者:
Gilfillan S;Chan CJ;Cella M;Haynes NM;Rapaport AS;Boles KS;Andrews DM;Smyth MJ;Colonna M

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自然杀伤细胞(NK)和CD8 T细胞需要黏附分子来迁移、激活、扩增、分化和发挥效应功能。DNAX辅助分子1 (DNAM-1)是一种属于免疫球蛋白超家族的粘附分子,在体外促进了许多这些功能。然而,由于NK细胞和CD8 T细胞表达多种粘附分子,目前尚不清楚DNAM-1在体内是具有独特的功能还是实际上是冗余的。为了解决这个问题,我们制造了缺乏DNAM-1的小鼠,并在体外和体内评估了缺乏DNAM-1的CD8 T细胞和NK细胞的功能。我们的研究结果表明,CD8 T细胞在识别非专业抗原呈递细胞呈递的抗原时需要DNAM-1进行共刺激;相反,当树突状细胞呈递抗原时,DNAM-1是可有可无的。同样,NK细胞需要DNAM-1来消除肿瘤细胞,而肿瘤细胞对NK细胞介导的细胞毒性相对有抵抗力,而NK细胞介导的细胞毒性是由其他NK细胞激活配体的缺乏引起的。我们得出的结论是,DNAM-1可以扩展可以激活CD8 T细胞和NK细胞的靶细胞的范围,因此,对于逃避其他激活或辅助分子识别的肿瘤和/或病毒的免疫监视可能是必不可少的。
Natural killer (NK) cells and CD8 T cells require adhesion molecules for migration, activation, expansion, differentiation, and effector functions. DNAX accessory molecule 1 (DNAM-1), an adhesion molecule belonging to the immunoglobulin superfamily, promotes many of these functions in vitro. However, because NK cells and CD8 T cells express multiple adhesion molecules, it is unclear whether DNAM-1 has a unique function or is effectively redundant in vivo. To address this question, we generated mice lacking DNAM-1 and evaluated DNAM-1–deficient CD8 T cell and NK cell function in vitro and in vivo. Our results demonstrate that CD8 T cells require DNAM-1 for co-stimulation when recognizing antigen presented by nonprofessional antigen-presenting cells; in contrast, DNAM-1 is dispensable when dendritic cells present the antigen. Similarly, NK cells require DNAM-1 for the elimination of tumor cells that are comparatively resistant to NK cell–mediated cytotoxicity caused by the paucity of other NK cell–activating ligands. We conclude that DNAM-1 serves to extend the range of target cells that can activate CD8 T cell and NK cells and, hence, may be essential for immunosurveillance against tumors and/or viruses that evade recognition by other activating or accessory molecules.
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