在癌症免疫治疗期间,CD8+T细胞调节瘤铁
Weimin Wang1,2, Michael Green2,3, Jae Eun Choi2,4,5
1Department of Surgery, University of Michigan School of Medicine, Ann Arbor, MI, USA.
Nature
|May 3, 2019
概括
癌症免疫疗法增强了CD8+T细胞功能,通过铁死促进了瘤细胞的死亡. 干扰素 (IFNγ) 降低了囊的摄取,增加了脂质过氧化,并有助于抗瘤功效. 结合疗法是有前途的
科学领域:
- 免疫学
- 癌症学
- 细胞死亡机制
背景情况:
- 癌症免疫疗法利用CD8+ T细胞通过已知的细胞死亡途径消除瘤.
- 铁死是一种依赖于铁的细胞死亡形式,在病理学中起着新兴的作用,但与T细胞免疫和癌症免疫治疗的联系尚不清楚.
研究的目的:
- 研究铁质在T细胞介导的抗瘤免疫和癌症免疫治疗中的作用.
- 阐明CD8+ T细胞影响瘤细胞中的分子机制.
主要方法:
- 研究免疫疗法激活的CD8+T细胞对瘤细胞铁的影响.
- 检查了干扰素 (IFNγ) 在调节谷氨酸-胺抗载体系统 (SLC3A2和SLC7A11) 和随后的瘤细胞脂质过氧化中的作用.
- 使用囊酶和检查点阻塞的小鼠模型来评估协同作用的抗瘤作用.
- 分析了接受nivolumab治疗的人类癌症患者的数据和转录组.
主要成果:
- 免疫疗法激活的CD8+T细胞增强瘤细胞中的铁,从而促进抗瘤功效.
- IFNγ降低了系统xc-子单元 (SLC3A2,SLC7A11),损害了囊的吸收,并促进了瘤细胞的铁亡.
- 结合囊酶和检查点阻塞在小鼠模型中协同增强了抗瘤免疫力和诱导铁死.
- 在癌症患者中,高系统xc-表达与不良结果相关,而nivolumab治疗的临床益处与降低的SLC3A2和增加的IFNγ和CD8表达相关.
结论:
- 由T细胞驱动的瘤铁是一个重要的抗瘤机制.
- 与检查点阻断相结合, 向铁死途径是癌症治疗的一个有前途的治疗策略.
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