通过抑制T细胞中的Pdcd1表达,CBX4促进抗瘤免疫力
Liwei Ren1, Ziyin Li1, Yu Zhou2
1Department of Immunology, School of Basic Medical Sciences, NHC Key Laboratory of Medical Immunology, Peking University, Beijing, China.
Molecular oncology
|September 11, 2023
概括
缺少CBX4蛋白质会通过增加PD-1表达和阻碍细胞因子的产生,从而降低T细胞抗瘤免疫力. 这种编程细胞死亡蛋白1 (PD-1) 的表观遗传调节会影响T细胞功能和瘤生长.
科学领域:
- 免疫学 免疫学 免疫学
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 在瘤学瘤学.
背景情况:
- CBX4 (染色盒4) 是参与基因调节的多抑制综合体1 (PRC1) 的一个组成部分.
- 它在T细胞介导的抗瘤免疫力中的作用尚不清楚.
- 已知瘤生长,转移和血管生成都由CBX4调节.
研究的目的:
- 研究CBX4在T细胞介导的抗瘤免疫中的功能.
- 阐明CBX4影响T细胞功能和PD-1表达的分子机制.
主要方法:
- 产生具有T细胞特异缺失Cbx4.4的小鼠.
- 对瘤生长和瘤透淋巴细胞 (TILs) 的分析.
- 评估T细胞中细胞因子生产 (TNF-α,IFN-γ) 和PD-1水平.
- 对Pdcd1促进体的表观遗传学分析,包括基因素修饰 (H2AK119ub1,H3K27me3).
- 研究PRC1和PRC2抑制对Pdcd1表达的影响.
主要成果:
- 特定于T细胞的Cbx4删除加速了瘤的生长.
- 淘汰赛小鼠在TILs中表现出TNF-α和IFN-γ产生受损,PD-1水平升高.
- 在外围T细胞中观察到失调的Pdcd1表达和受损的T细胞受体 (TCR) 刺激反应.
- 在CBX4过度表达下调Pdcd1表达.
- Cbx4 缺陷降低了 Pdcd1 促成体中的抑制性歇斯顿修饰.
- 在Cbx4转移的细胞中抑制PRC1或PRC2恢复Pdcd1表达.
结论:
- CBX4在调节T细胞功能和抗瘤免疫力方面发挥着至关重要的作用.
- 在表观遗传学上,CBX4通过其促进体的基因组修饰来控制Pdcd1的表达.
- 这项研究揭示了一种新的机制,将CBX4,表观遗传调节和T细胞免疫监测联系起来.
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