针对内体贩运介导的抗原逃逸,使骨髓瘤对CAR-T疗法重新敏感
Zhuning Wang1, Guanli Wang1, Yujie Liu1
1Department of Hematology, Shanghai East Hospital, Tongji University School of Medicine, Shanghai, Shanghai, China.
Journal for immunotherapy of cancer
|March 9, 2026
概括
在CAR-T疗法中,抗原逃逸是由RRM2-介导的MICA/B贩运驱动的. 重新定位胺恢复了MICA/B呈现,增强了CAR-T对多发性骨髓瘤的疗效.
科学领域:
- 免疫学 免疫学 免疫学
- 在瘤学瘤学.
- 细胞生物学 细胞生物学
背景情况:
- 抗原逃逸是化学抗原受体 (CAR) -T疗法中复发的主要原因,特别是在多发性髓瘤中.
- 了解驱动抗原损失的瘤内在途径对于使瘤重新敏感于CAR-T细胞攻击至关重要.
- 一种新型的翻译后机制,涉及核酸减少酶子单元M2 (RRM2),已被确定为抗原逃逸的驱动因素.
研究的目的:
- 研究RRM2在多发性骨髓瘤中抗原逃逸中的作用.
- 确定克服NKG2DCAR-T细胞疗法的抗性策略.
- 为了评估osalmid与CAR-T疗法结合的治疗潜力.
主要方法:
- 单细胞RNA测序和多重免疫光检测确定了RRM2+骨髓瘤亚群,MICA/B低.
- 功能验证使用骨髓瘤器官和异种移植模型来评估奥萨尔米德对CAR-T活性的影响.
- 同免疫沉,GTP拉低和共聚焦显微镜阐明了贩运机制.
主要成果:
- 确定了一个RRM2+骨髓瘤亚群,MICA/B减少,有助于NKG2DCAR-T耐药性.
- 证明RRM2可以调节MICA/B贩运,促进 lysosomal 降解和抑制回收.
- 亚毒性奥萨尔米德治疗恢复了MICA/B表现,并与NKG2D CAR-T细胞协同作用,导致持续的瘤缓解.
结论:
- 在CAR-T疗法中,RRM2驱动的贩运是一种新的,可向的抗原逃逸机制.
- 重新利用奥萨尔米德来恢复MICA/B表面呈现,为多发性骨髓瘤提供了一种临床上可转换的策略.
- 调节细胞内流通是一种有前途的方法,可以在细胞免疫疗法中克服抗性.
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