非均的内电离辐射剂量与PD1和CXCR2阻断产生协同作用
Paul Bergeron1, Morgane Dos Santos2, Lisa Sitterle1
1Gustave Roussy, INSERM U1030, Université Paris-Saclay, Villejuif, France.
Nature communications
|October 13, 2024
概括
结合低剂量和高剂量的部分瘤辐射可以增强抗瘤反应. 这种策略与PD1阻断和CXCR2抗剂相结合,在临床前癌症模型中改善瘤控制和存活率.
科学领域:
- 在瘤学瘤学.
- 免疫学 免疫学 免疫学
- 放射疗法是一种放射治疗.
背景情况:
- 放射治疗 (RT) 的疗效和副作用取决于剂量和辐射量.
- RT剂量影响瘤免疫微环境 (TIME) 调制.
- 低剂量RT (LDRT) 促进免疫透,而高剂量RT (HDRT) 导致细胞死亡.
研究的目的:
- 为了研究部分瘤辐射 (PI) 结合LDRT和HDRT以增强抗瘤免疫力.
- 评估PI与免疫调节剂结合用于改善癌症治疗.
- 探索PI的潜在免疫机制.
主要方法:
- 结直肠和乳腺癌在免疫能力强的小鼠中的临床前模型.
- 毫米精度部分瘤辐射提供LDRT (2 Gy) 和HDRT (16 Gy).
- 使用抗PD1和CXCR2抗剂 (SB225002) 的联合治疗.
- 流细胞计,细胞因子分析和单细胞RNA测序.
主要成果:
- 与抗PD1结合的PI显著控制了瘤生长.
- PI诱导了细胞毒性CD8+T细胞反应,还通过CXCR2通过前瘤中性粒细胞透.
- 结合PI,PD1阻断和CXCR2抗剂,改善了瘤控制和小鼠的存活率.
结论:
- 部分瘤照射提供了一种提高RT疗效和降低毒性的策略.
- 在差异辐射瘤体内准免疫交叉声可以改善治疗结果.
- 这种方法有望改善RT和免疫检查点抑制剂的治疗指数.
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