TMED抑制抑制细胞表面PD-1表达,并克服T细胞功能障碍
David W Vredevoogd1, Georgi Apriamashvili1, Pierre L Levy1
1Department of Molecular oncology and immunology, Netherlands Cancer Institute, Oncode Institute, Amsterdam, The Netherlands.
Journal for immunotherapy of cancer
|November 7, 2024
概括
研究人员确定TMED家族蛋白质是CD8 T细胞PD-1表达的关键调节者. 抑制TMED可降低PD-1,增强抗瘤免疫力,并在癌症模型中逆转T细胞功能障碍.
科学领域:
- 免疫学 免疫学 免疫学
- 癌症生物学 癌症生物学
- 分子生物学分子生物学
背景情况:
- 编程细胞死亡蛋白1 (PD-1) 免疫检查点阻断 (ICB) 是一种有前途的癌症治疗方法.
- 调节CD8T细胞上PD-1表达的机制在很大程度上是未知的.
- 在T细胞激活时诱导PD-1,因此需要识别抑制PD-1而不损害T细胞功能的调节剂.
研究的目的:
- 发现CD8 T细胞上PD-1表达的新型调节剂.
- 为了确定增强抗瘤免疫反应的目标.
- 寻找抑制降低PD-1丰度而不会影响T细胞激活的调节剂.
主要方法:
- 在初级小鼠CD8T细胞上进行了全基因组CRISPR-Cas9选.
- 使用CD137作为激活标记物的双读系统将PD-1调节器与一般的T细胞激活基因区分开来.
- 在体外和体内实验中使用TMED抑制剂和瘤透淋巴细胞 (TILs) 的分析.
主要成果:
- TMED家族蛋白质,特别是TMED10的无活化,降低了PD-1表面丰度,并增强了T细胞活性.
- TMED的失活也抑制了细胞毒性T淋巴细胞相关蛋白4 (CTLA-4) 的表达.
- 用TMED抑制剂治疗导致了TMED-PD-1复合体的溶酶体降解,减少了瘤透的CD8T细胞中的PD-1,并逆转了T细胞功能障碍.
- 在CD8TIL中高TMED表达与T细胞功能障碍特征,ICB反应差,患者存活时间缩短相关.
结论:
- TMED家族蛋白质代表了PD-1表达的新型调节机制.
- TMED被确定为抑制PD-1和T细胞功能障碍的药理学上可处理的标.
- 抑制TMED有可能提高癌症免疫疗法的疗效.
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