癌细胞中的Acod1表达促进了通过生成抑制性的免疫逃避
James H Schofield1, Joseph Longo2, Ryan D Sheldon3
1Department of Biological Sciences, University of Notre Dame, Notre Dame, Indiana 46556 USA.
bioRxiv : the preprint server for biology
|September 25, 2023
概括
免疫检查点阻塞疗法受到免疫抑制瘤微环境的限制. 在癌细胞中准酸脱碳酶 (Acod1) 可以通过防止CD8+ T细胞抑制来使瘤对PD-1阻塞敏感.
科学领域:
- 免疫学 免疫学 免疫学
- 癌症生物学 癌症生物学
- 代谢途径 代谢途径
背景情况:
- 免疫检查点阻塞 (ICB) 疗法,特别是针对PD-1,是癌症治疗的基石.
- 瘤微环境 (TME) 内的免疫抑制因素往往限制了ICB的有效性.
- 某些癌症类型对ICB表现出耐药性,需要采取克服TME媒介免疫抑制的策略.
研究的目的:
- 研究免疫抑制代谢物在αPD-1耐药性中的作用.
- 为了确定癌细胞逃避αPD-1治疗的机制.
- 探索克服αPD-1耐药性的策略.
主要方法:
- 在αPD-1-耐药癌细胞中对伊塔科纳酸盐 (ITA) 生产的分析.
- 评估乙酸脱碳酶 (Acod1) 的水平和功能.
- 研究Acod1调制对瘤对αPD-1治疗敏感性的影响.
- 描述癌细胞分泌因子对CD8+T细胞增殖的影响.
主要成果:
- 抗αPD-1的癌细胞表现出较高的伊塔康酸盐 (ITA) 生产,这是由于乙酸盐脱酶 (Acod1) 的增加导致的.
- 降低癌细胞中的Acod1水平恢复了对αPD-1治疗的敏感性.
- 具有高Acod1的癌细胞通过分泌的抑制性质抑制CD8+T细胞增殖,而不是ITA.
- 这种抑制T细胞增殖是αPD-1耐药性的关键机制.
结论:
- 在调解癌细胞抵抗αPD-1免疫疗法的过程中,Acod1起着至关重要的作用.
- 向Acod1活动是一个潜在的治疗策略,可以提高ICB在耐药瘤中的疗效.
- 对Acod1抑制的进一步研究可能会导致在癌症治疗中克服TME诱导的免疫抑制的新方法.
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