针对不同免疫区的免疫疗法与放射治疗相结合,诱导了耐药瘤的回归
Nils-Petter Rudqvist1,2,3, Maud Charpentier1, Claire Lhuillier1,4
1Department of Radiation Oncology, Weill Cornell Medicine, New York, NY, 10065, USA.
Nature communications
|August 24, 2023
概括
放射治疗与CTLA-4抑制相结合,通过改变T细胞种群,改善抗癌免疫力. 这种组合疗法,特别是与CD40激动剂,显示了增强瘤反应在耐药癌症的承诺.
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:
- 放射治疗 (RT) 可以增强抗瘤免疫反应,当与CTLA-4抑制 (CTLA4i) 结合使用.
- 然而,对这种组合的深度反应并不常见,特别是在免疫疗法耐药的癌症,如三阴性乳腺癌 (TNBC) 中.
研究的目的:
- 在TNBC模型中识别合理的组合免疫疗法以改善治疗反应.
- 阐明对联合RT和CTLA4i的反应和耐药性的免疫机制.
主要方法:
- 使用了对免疫疗法耐药的三阴性乳腺癌的小鼠模型.
- 在RT,CTLA4i和组合疗法后分析了T细胞群 (CD4+,CD8+) 和它们的表型 (效应器记忆,激活,耗尽).
- 评估了针对额外的免疫检查点 (PD1) 的有效性,并探索了组合的CD40激动剂疗法.
主要成果:
- CTLA4i扩大了CD4+ T辅助细胞;RT增强了T细胞克隆性和CD8+ T细胞耗尽.
- 组合疗法减少了调控性CD4+T细胞,增加了效应记忆,早期激活和前体耗尽的CD8+T细胞.
- 这些CD8+T细胞子集的基因特征与患者的存活率相关.
- 向PD1是无效的,但CD40激动剂治疗使得抗RT+CTLA4i的瘤敏感.
结论:
- 结合RT和CTLA4i调节特定的CD8+T细胞子集,与改善的结果相关.
- 治疗CD40激动剂是一种有前途的策略,通过吸引不同的免疫组来克服对RT和CTLA4i的耐药性.
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