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Nature:科学家发现调控CD8+T细胞在肿瘤组织中定居的重要转录因子

2017-12-18 MedSci MedSci原创

组织记忆性CD8+T(TRM)细胞通常存在于病原发生的部位,在这些部位他们精确、快速、高效的进行保护性免疫应答反应。

组织记忆性CD8+T(TRM)细胞通常存在于病原发生的部位,在这些部位他们精确、快速、高效的进行保护性免疫应答反应。然而我们对TRM细胞分化和保持稳态的分子机制了解非常少。因此,来自加州大学圣迭戈分校的Justin Milner和他的同事研究发现小鼠的TRM前体细胞代表了 一群特殊的CD8+T细胞群体,这群细胞从基因表达以及染色质可接近性等均与循环记忆细胞群体表现出了明显的不同。通过计算和汇集体内RNA干扰筛选的数据,他们发现转录因子Runx3在TRM细胞分化和保持稳态等方面发挥着重要的作用。Runx3在许多不同组织环境中都发挥调控TRM细胞群体形成的重要功能。

此外Runx3还能在支持重要的组织特异性基因表达的同时抑制游走和循环相关基因的表达。另外,我们发现人和小鼠的肿瘤浸润淋巴细胞与TRM细胞共享一个主要的组织常驻基因表达模型,而这些都与Runx3的活性相关。在接受过继T细胞治疗骨肉瘤的小鼠模型中,Runx3缺失的CD8+肿瘤浸润的淋巴细胞不能在肿瘤内聚集,结果导致肿瘤细胞更强的生长能力和致死性。相反的,过表达Runx3能够提高肿瘤特异性CD8+ T 细胞的聚集,延迟肿瘤的生长以及延长患者的生存期。为了研究Runx3在调控TRM细胞分化过程中的核心作用,这些结果揭示了促进T细胞定居在非淋巴位点的信号通路,而这可以被用来提高靶向肿瘤细胞的疫苗或者过继细胞治疗的效果。

原文出处:

Milner J J, Toma C, Yu B, et al. Runx3 programs CD8+ T cell residency in non-lymphoid tissues and tumours[J]. Nature, 2017.doi:10.1038/nature24993javascript:void(0);/*1513591851067*/

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    2018-07-24 liye789132251
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    2018-04-03 mjldent
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