免疫应激诱导的瘤突变负担和4T1乳腺癌细胞中的新抗原表达:在接受免疫检查点抑制剂治疗的患者中,长期生存的潜在机制
Tomoyuki Ishiguro1, Kazuyuki Takeda2, Daisuke Takayanagi1
1Department of Medicine, Division of Medical Oncology, School of Medicine, Showa University, Tokyo, Japan.
Cancer genomics & proteomics
|December 27, 2024
概括
在免疫应激下,癌细胞会发生突变,导致免疫逃脱或免疫性增加,这解释了对免疫检查点抑制剂 (ICI) 的抵抗或反应. 这种免疫应激反应也可以解释ICI治疗患者中观察到的"袋鼠尾"生存曲线现象.
科学领域:
- 免疫学 免疫学 免疫学
- 癌症生物学 癌症生物学
- 遗传学 是一个遗传学.
背景情况:
- 免疫检查点抑制剂 (ICI) 可以在一组患者中导致长期生存,其特征是"袋鼠尾"生存曲线.
- 驱动这种现象的潜在机制和ICI耐药癌症的行为仍然不太清楚.
研究的目的:
- 在免疫应激下研究癌细胞中的遗传和分子变化.
- 阐明"袋鼠尾"生存曲线背后的机制和癌症对ICI的耐药性.
主要方法:
- 与对照小鼠 (RAG-/- + ACT) 相比,在免疫受损小鼠 (RAG-/- + ACT) 免疫应激下,对来自乳腺腺的4T1癌细胞 (4T1-HA) 突变的分析.
- 对基因突变,瘤突变负担 (TMB),微卫星不稳定性 (MSI),新抗原状态,替代拼接和副本数变异 (CNV) 的评估.
主要成果:
- 免疫应激增加了癌细胞中的基因突变,TMB和MSI得分.
- 突变保留了新抗原的功能,可能导致"袋鼠尾"的生存.
- 观察到免疫反应基因和癌症扩散基因的变化.
- CNV分析表明,在免疫应激下,抗原呈现和免疫反应受损.
结论:
- 癌细胞通过获得免疫逃生机制和增强免疫性来适应免疫应激.
- 这种双重适应可以导致对免疫检查点抑制剂 (ICI) 的耐药性或反应.
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