Super-killer CTLs are generated by single gene deletion of Bach2.

Super-killer CTLs are generated by single gene deletion of Bach2.
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DOI:
10.1002/eji.202249797
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发表时间:
2022-11
影响因子:
5.4
通讯作者:
--
中科院分区:
医学3区
文献类型:
--
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Bach2 编码对 T 细胞介导的免疫调节产生重大影响的转录调节因子。源自小鼠 CD8+ T 细胞体外激活的效应 CTL 在缺乏 BACH2 的情况下显示出增殖和细胞溶解能力增加。在激活之前,与野生型相比,BACH2 缺陷型脾 CD8+ T 细胞具有更高的记忆丰度,并且幼稚细胞的丰度减少。源自中央记忆 T 细胞的 CTL 比源自幼稚 T 细胞的 CTL 具有更强的细胞毒性,但即使在不同的亚群中,BACH2 缺陷也具有细胞毒性优势。免疫荧光和电子显微镜显示,与野生型 CTL 相比,BACH2 缺陷的颗粒更大,蛋白质组分析显示颗粒含量增加,包括穿孔素和颗粒酶。因此,在缺乏 BACH2 的效应 CTL 中观察到的细胞毒性增强不仅源于其初始分化状态的差异,还源于增大的溶细胞颗粒的固有产生。这些结果证明了单基因缺失如何产生 CTL 超级杀手。缺乏 BACH2 的小鼠产生的 CTL 显示靶细胞杀伤力增强。这是由于相对于幼稚 (CD8+n) 脾细胞而言,记忆 CD8+ (CD8+mem) 数量增加,以及位于扩大颗粒中的溶细胞蛋白表达增加。这项研究表明,BACH2 的缺失会产生“超级杀手”CTL。
Bach2 codes for a transcriptional regulator exerting major influences on T cell‐mediated immune regulation. Effector CTLs derived from in vitro activation of murine CD8+ T cells showed increased proliferative and cytolytic capacity in the absence of BACH2. Before activation, BACH2‐deficient splenic CD8+ T cells had a higher abundance of memory and reduced abundance of naïve cells compared to wild‐type. CTLs derived from central memory T cells were more potently cytotoxic than those derived from naïve T cells, but even within separated subsets, BACH2‐deficiency conferred a cytotoxic advantage. Immunofluorescence and electron microscopy revealed larger granules in BACH2‐deficient compared to wild‐type CTLs, and proteomic analysis showed an increase in granule content, including perforin and granzymes. Thus, the enhanced cytotoxicity observed in effector CTLs lacking BACH2 arises not only from differences in their initial differentiation state but also inherent production of enlarged cytolytic granules. These results demonstrate how a single gene deletion can produce a CTL super‐killer. CTLs generated from mice lacking BACH2 show increased target cell killing. This arises both from increased numbers of memory CD8+ (CD8+mem) relative to naïve (CD8+n) splenocytes as well as the increased expression of cytolytic proteins localised in enlarged granules. This study shows that loss of BACH2 generates “super‐killer” CTLs.
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