与瘤相关的巨细胞通过原沉积和乳腺癌微环境的代谢重编程来限制CD8+T细胞功能
Kevin M Tharp1, Kelly Kersten2,3, Ori Maller1
1Center for Bioengineering and Tissue Regeneration, Department of Surgery, University of California San Francisco, San Francisco, CA, USA.
Nature cancer
|June 3, 2024
概括
瘤纤维化通过改变与瘤相关的巨细胞 (TAMs) 来阻碍抗癌免疫力. 这些TAMs创造了一个代谢环境,损害了CD8+T细胞功能,这对于有效的癌症免疫疗法至关重要.
科学领域:
- 免疫学 免疫学 免疫学
- 在瘤学瘤学.
- 生物化学 生物化学
背景情况:
- 瘤进展通常涉及纤维化,其特点是细胞外基质沉积过多.
- 纤维化与免疫细胞的透减少有关,包括细胞毒性T淋巴细胞,这些淋巴细胞对于抗瘤反应至关重要.
- 瘤微环境 (TME) 在调节免疫细胞功能和治疗疗效方面发挥着至关重要的作用.
研究的目的:
- 研究瘤相关巨细胞 (TAMs) 如何响应纤维性TME的机械和生化线索.
- 阐明TAM重编程在纤维性TME中对CD8+T细胞功能的代谢后果.
- 了解纤维TME损害抗瘤免疫力的双重机制.
主要方法:
- 在纤维化瘤微环境中分析TAMs.
- 研究TAM中的原生物合成途径,重点转化增长因子-β (TGF-β) 信号.
- 评估与原蛋白合成相关的巨细胞的代谢变化 (氨酸消耗,氨酸合成,氨酸分泌).
- 在女性乳腺癌模型中评估这些代谢变化对CD8+T细胞功能和抗瘤反应的影响.
主要成果:
- TAMs启动原蛋白生物合成,以响应硬,纤维化的TME,由TGF-β驱动.
- 巨细胞的原蛋白合成导致氨酸的耗尽和氨酸的产生,创造了一个敌对的代谢环境.
- 这种改变的代谢环境会损害CD8+ T细胞的功能,损害它们的抗瘤活性.
- 纤维性TME通过物理排除和TAMs的机械代谢重编程来阻碍抗瘤免疫力.
结论:
- 一个硬和纤维化的TME将TAM重编程以合成原蛋白,改变其代谢活性.
- 这种TAM重编程会产生不利的代谢环境,抑制CD8+ T细胞介导的抗瘤免疫力.
- 针对TAM机械代谢编程可能是提高纤维化瘤免疫治疗疗效的策略.
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