利用炎症单细胞克服抗PD-1免疫疗法的抵抗力
bioRxiv : the preprint server for biology
|February 12, 2026
概括
用CD40激素治疗激活炎症单细胞可以通过使CD8+T细胞控制瘤生长来克服对免疫检查点抑制剂的抵抗,即使在抗原缺乏瘤中也是如此. 这种方法有望改善患者的治疗结果.
科学领域:
- 免疫学 免疫学 免疫学
- 在瘤学瘤学.
- 癌症研究 癌症研究
背景情况:
- 免疫检查点抑制剂 (ICI) 受到超过50%的黑色素瘤患者获得的耐药性限制.
- 身体突变,如β-2微球蛋白 (B2m) 损失,导致瘤逃避T细胞介导的杀死,从而导致耐药性.
- 了解抵抗机制对于开发有效的癌症免疫疗法至关重要.
研究的目的:
- 研究抗原呈现缺陷瘤中对ICI获得性耐药性的机制.
- 通过准髓状细胞再极化来探索克服抗性的治疗策略.
- 定义免疫细胞和细胞因子在对CD40激动剂治疗的反应中的作用.
主要方法:
- 单细胞RNA-seq,流细胞测量和ex vivo测定在B2m-null瘤中特征免疫细胞.
- 患有B2m-null瘤的小鼠被用抗PD-1或CD40主动抗体以及细胞枯竭或细胞因子抑制剂治疗.
- 分析了已发表的人类RNA-seq数据集,以评估炎症单细胞对患者结果的贡献.
主要成果:
- B2m-null瘤显示免疫抑制性巨细胞增加;CD40激动剂治疗减少了瘤生长和改善了生存率.
- 作为CD40激动剂的有效性,需要CD8+ T细胞和NK细胞,这些细胞通过IFNγ分泌来控制瘤,而不是直接识别瘤细胞.
- 在宿主细胞上的IFNγ受体表达,而不是瘤细胞,对于CD40激动剂疗效至关重要.
- 在接受治疗的瘤中,确定了具有 IFNγ 响应特征的独特炎症单细胞群.
- 对人类数据集的分析将炎症单细胞特征与改善的患者结果和ICI反应联系起来.
结论:
- CD8+ T 细胞可以控制瘤生长,即使没有直接的瘤抗原呈现.
- 激活炎症单细胞效应因子功能是克服ICI耐药性的潜在策略.
- 准髓状细胞再极化可能会增强抗瘤免疫力并改善治疗反应.
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