老化的瘤微环境限制了T细胞对癌症的控制
Alex C Y Chen1,2,3,4, Sneha Jaiswal1,5, Daniela Martinez1,2,3,4
1Krantz Family Center for Cancer Research, Massachusetts General Hospital, Boston, MA, USA.
Nature immunology
|May 14, 2024
概括
衰老会通过在瘤微环境 (TME) 中引起CD8+T细胞功能障碍而降低抗瘤免疫力. 这种由TME驱动的与年龄相关的功能障碍阻碍了癌症疫苗的有效性,但可以通过针对骨髓细胞的治疗来克服.
科学领域:
- 免疫学 免疫学 免疫学
- 癌症生物学 癌症生物学
- 衰老研究研究 衰老研究
背景情况:
- 与年龄相关的免疫功能障碍或"免疫衰变"显著影响癌症的进展和治疗疗效.
- 老龄化影响瘤微环境 (TME) 内的抗瘤T细胞反应的具体机制尚不完全理解.
研究的目的:
- 调查老年TME中CD8+T细胞功能受损的原因及其对瘤控制的影响.
- 与传统的T细胞枯竭相比,与年龄相关的T细胞功能障碍的独特性质的特征.
- 探索治疗策略,在衰老的癌症模型中恢复抗瘤免疫力.
主要方法:
- 在年轻与老年瘤携带小鼠中对CD8+T细胞透,功能和转录特征进行比较分析.
- 使用T细胞从年轻小鼠转移到老小鼠的收养转移实验.
- 研究免疫细胞交叉,包括自然杀手细胞,树突细胞和CD8+T细胞,在老年TME.
- 针对髓状细胞和树突细胞功能的治疗干预措施的评估.
主要成果:
- 在老年TME中,有限的CD8+T细胞原始化,而不是内在的T细胞缺陷,是减少瘤控制的主要驱动因素.
- 年龄化的TME诱导了一个独特的"瘤透与年龄相关的功能障碍" (TTAD) T细胞状态,与规范性疲劳不同.
- 在老年瘤中,自然杀手细胞,树突细胞和CD8+ T细胞之间的交叉声损害了T细胞原始化,并促进了TTAD的形成.
- 由于TTAD细胞诱导,老年小鼠对治疗性瘤疫苗接种具有抗性.
- 针对骨髓细胞的向疗法成功地重振树突细胞,改善瘤控制和恢复CD8+ T细胞免疫力.
结论:
- 老年TME中的细胞外部因素在驱动T细胞功能障碍和限制抗瘤免疫力方面至关重要.
- TTAD细胞状态代表了老化癌症中免疫逃避的新机制.
- 通过骨髓细胞向疗法恢复常规的1型树突细胞功能,为增强老年人癌症免疫疗法提供了一个有希望的策略.
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