高剂量的 Askorbic 酸选择性地诱导 LKB1 缺陷肺癌中的 pyroptosis,并使免疫治疗敏感
Xiangyu Sun1, Xiaoting Cai1, Shangbiao Li2
1Department of Radiation Oncology, Nanfang Hospital, Southern Medical University, Guangzhou 510515, China.
Cell reports. Medicine
|August 16, 2025
概括
高剂量的甲酸 (AA) 可以克服LKB1缺乏的非小细胞肺癌 (NSCLCs) 的免疫检查点抑制剂 (ICI) 耐药性. 这通过诱导热和通过树突细胞成熟增强抗瘤免疫力来发生.
科学领域:
- 在瘤学瘤学.
- 免疫学 免疫学 免疫学
- 癌症新陈代谢 癌症新陈代谢
背景情况:
- 在非小细胞肺癌 (NSCLCs) 中肝激酶B1 (LKB1) 缺乏导致对免疫检查点抑制剂 (ICI) 的初级耐药性.
- 瘤氧化还原失衡在这些耐药NSCLC中具有潜在的治疗脆弱性.
研究的目的:
- 为了研究高剂量 Askorbic 酸 (AA) 在 LKB1 缺乏的 NSCLC 中的治疗潜力.
- 阐明AA影响NSCLC氧化还原平衡,细胞死亡和免疫反应的机制.
主要方法:
- 使用临床前NSCLC模型与LKB1缺乏.
- 服用高剂量的甲酸 (AA) 和免疫检查点抑制剂 (ICI).
- 分析了瘤的氧化还原状态,热致死标记物 (caspase-3,gasdermin-E),免疫细胞透 (TCF1+CD8+T细胞) 和树突细胞 (DC) 功能.
主要成果:
- 在LKB1缺陷上调GLUT1,增加AA积累,并加剧NSCLC细胞的氧化还原失衡.
- 高剂量的AA通过LKB1缺乏NSCLC中的H2O2/ROS-caspase-3-GSDME轴触发热.
- AA治疗逆转ICI耐药性,促进TCF1+CD8+T细胞 (Tpex) 透和DC成熟,这取决于CD103+DCs.
结论:
- 高剂量的AA可以通过诱导热和免疫细胞死亡来克服LKB1缺乏NSCLC中的ICI耐药性.
- 通过DC成熟,AA诱导的亡驱动Tpex细胞扩张和抗瘤免疫力.
- 加斯德明-E (GSDME) 对于激素灭驱动的抗瘤免疫是至关重要的,支持结合ICI和高剂量AA的临床试验.
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