将CMTM6和CMTM4确定为PD-L1蛋白调节剂
Riccardo Mezzadra1, Chong Sun1, Lucas T Jae2
1Division of Molecular Oncology &Immunology, The Netherlands Cancer Institute, Plesmanlaan 121, 1066 CX Amsterdam, The Netherlands.
Nature
|August 17, 2017
概括
研究人员发现了CMTM6,一种调节转移性癌症PD-L1表达的蛋白质. CMTM6稳定了PD-L1,增强了其抑制T细胞反应的能力,为癌症治疗提供了新的点.
科学领域:
- 免疫学
- 癌症生物学
- 分子细胞生物学
背景情况:
- 在各种转移性癌症中,PD-1/ PD- L1轴对抑制抗瘤T细胞反应至关重要.
- 虽然PD-L1表达是关键的,但其精确的调节仍然不太清楚.
- 了解PD-L1调节对于开发有效的癌症免疫疗法至关重要.
研究的目的:
- 确定编程死亡连接体1 (PD-L1) 蛋白表达的新型调节剂.
- 阐明确定调节剂影响PD-L1蛋白水平和功能的机制.
- 探索针对PD-L1调节的潜在治疗策略.
主要方法:
- 进行了单体基因查以确定调节PD-L1的蛋白质.
- 使用基因修饰幕和补充实验.
- 研究了CMTM6对PD-L1转录,无化和蛋白质半衰期的影响.
- 评估CMTM6对PD-L1表达瘤细胞的T细胞抑制的影响.
主要成果:
- 确定了CMTM6,一种跨膜蛋白,作为PD-L1蛋白的新型调节剂.
- 如果干扰CMTM6及其家族成员CMTM4,但不能干扰其他CMTM,则会损害PD-L1蛋白的表达.
- 在不影响转录的情况下,CMTM6通过减少其无处不在和增加其半衰期来稳定PD- L1.
- CMTM6增强了PD- L1介导的T细胞反应抑制.
结论:
- PD-L1蛋白的稳定性和功能依赖于CMTM6和CMTM4的调节.
- CMTM6 作为细胞表面PD- L1 蛋白水平的积极调节剂.
- 针对CMTM6/4与PD-L1的相互作用,为阻止癌症中的PD-1/PD-L1通路提供了一个潜在的新策略.
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