通过降低MHC-I表达的调节,LATS1/2损失可以促进子宫内膜癌中的瘤免疫逃避
Qianlan Yang1,2, Zehen Lv3,2, Mengfei Wang1,2
1Department of Gynecology, Shanghai First Maternity and Infant Hospital, School of Medicine, Tongji University, Shanghai, 200092, China.
Journal of experimental & clinical cancer research : CR
|February 21, 2024
概括
在子宫内膜癌 (EC) 中的大型瘤抑制酶1/2 (LATS1/2) 损失通过降低主要基因相容性复合物I类 (MHC-I) 的调节促进免疫逃避. 恢复MHC-I表达可以逆转EC细胞对抗瘤免疫的抵抗力.
科学领域:
- 在瘤学瘤学.
- 免疫学 免疫学 免疫学
- 分子生物学分子生物学
背景情况:
- 大型瘤抑制酶1/2 (LATS1/2) 在子宫内膜癌 (EC) 中经常发生突变和下调.
- 通过主要基因相容性复合体I类 (MHC-I) 降低调节的抗原呈现受损,有助于瘤免疫逃避.
- 在EC免疫逃避中LATS1/2失调的确切作用尚不清楚.
研究的目的:
- 阐明EC中LATS1/2失调的致癌作用.
- 通过MHC-I调节,研究LATS1/2通过MHC-I调节影响免疫逃避的机制.
- 探索LATS1/2作为EC免疫治疗的潜在治疗点.
主要方法:
- 在EC患者队列 (TCGA和局部) 中分析LATS1/2突变,表达和临床意义.
- 使用CRISPR-Cas9.9构建LATS1/2淘汰EC细胞系.
- 用于差异基因表达分析的RNA测序.
- 共同免疫沉和GST下拉试验以确认LATS1/2-STAT1相互作用.
- 质谱学,激酶试验,ChIP-qPCR,流细胞计和免疫组织化学,以调查通过STAT1酸化对MHC-I的LATS1/2调节.
- 使用外周血液单核细胞 (PBMC) 杀死试验评估抗瘤活性.
主要成果:
- LATS1/2在EC中经常发生突变和下调,与MHC-I表达的减少相关,而不依赖Hippo-YAP通路.
- LATS1/2直接与STAT1在Ser727相互作用并酸化,增强其核积累并促进IRF1/NLRC5介导的MHC-I转录.
- LATS1/2的丧失使免疫细胞中介杀死产生抵抗力,这种抵抗力通过MHC-I再表达是可逆的.
结论:
- 通过降低MHC-I表达,EC中LATS1/2下调导致免疫逃避,抑制CD8+T细胞透.
- LATS1/2在干扰素- (IFN-γ) 信号介导的抗瘤免疫反应中起着至关重要的作用.
- 在欧洲共同体,LATS1/2代表了免疫检查点阻塞疗法的有前途的治疗标.
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