通过ESCRT介导的膜修复保护瘤衍生细胞免受T细胞的攻击
Alex T Ritter1, Gleb Shtengel2, C Shan Xu2
1Genentech, Inc., South San Francisco, CA 94080, USA.
概括
运输所需的内体分类复合体 (ESCRT) 蛋白质修复了细胞毒性T淋巴细胞 (CTL) 和自然杀手细胞所产生的毛孔. 抑制ESCRT增强了这些免疫细胞杀死癌细胞的作用.
科学领域:
- 免疫学
- 细胞生物学
- 分子生物学
背景情况:
- 细胞毒性T淋巴细胞 (CTL) 和自然杀手细胞 (NK) 清除感染病毒和瘤细胞.
- 这种杀死机制涉及穿孔素和粒酶的释放,穿孔素在细胞膜中形成孔隙,允许粒酶进入并诱导细胞亡.
- 已知用于运输 (ESCRT) 蛋白所需的内体分类复合体可以修复轻微的膜损伤.
研究的目的:
- 研究ESCRT蛋白在CTL中介细胞毒性的作用.
- 确定ESCRT机器是否影响目标细胞对穿孔酶介导的杀死.
主要方法:
- 使用来自癌症的细胞系作为点细胞.
- 观察了ESCRT蛋白质在释后的CTL参与点的招募.
- 在目标细胞中抑制ESCRT机制,并评估CTL介导杀死易感性的变化.
主要成果:
- 在穿孔素释放后,在CTL相互作用的部位,ESCRT蛋白迅速被引入血.
- 抑制ESCRT机制显著增加了癌细胞对CTL诱导的亡的敏感性.
- 这表明ESCRT介导的孔隙修复限制了格兰酶的进入.
结论:
- ESCRT 机器在穿蛋白诱导的细胞膜损伤的修复中起着至关重要的作用.
- 通过ESCRT蛋白质的修复机制起到抵抗因子的作用,限制了酶的输送和随后的亡.
- 向ESCRT可能会增强涉及CTL和NK细胞的免疫疗法对癌症的疗效.
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