I型干扰素通过激活骨髓细胞中的STAT1-IRF2通路来激活PD-1表达
Liyan Liang1, Yingcui Yang1, Kaidi Deng1
1School of Life Sciences, Tianjin University, Tianjin 300072, China.
Cells
|July 12, 2024
概括
干扰素-β (IFNβ) 通过STAT1-IRF2通路在髓状细胞中的调节细胞死亡蛋白1 (PD-1). 这一发现揭示了瘤微环境中的PD-1调节.
科学领域:
- 免疫学 免疫学 免疫学
- 分子生物学分子生物学
- 在瘤学瘤学.
背景情况:
- 编程细胞死亡蛋白1 (PD-1) 是髓状细胞上的关键抑制受体,调节瘤微环境功能.
- 控制髓状细胞中PD-1表达的精确机制在很大程度上是未知的.
研究的目的:
- 为了研究骨髓状细胞中PD-1表达的调节.
- 阐明涉及PD-1诱导的分子途径,由I型干扰子 (IFN-I) 诱导.
主要方法:
- 在人类结直肠癌髓状细胞中对PDCD1,IFNB1和IFNAR1的相关性分析.
- 在体外实验中用IFNβ治疗髓状细胞系并评估PD-1表达.
- 基因淘汰研究 (IFNAR1) 确认IFNβ的作用.
- 在瘤携带小鼠中使用IFNβ编码等离子体的体内研究.
- 分子分析包括STAT1和IRF激活,染色体免疫沉 (ChIP) 和促进体分析.
- 在患者瘤样本中对STAT1,IRF2和PDCD1的相关性分析.
主要成果:
- 在人类结直肠癌中,PDCD1表达与IFNB1和IFNAR1正相关.
- 试验室内IFNβ治疗增加了骨髓细胞中的PD-1表达.
- 淘汰IFNAR1取消了IFNβ诱导的PD-1上调.
- IFNβ激活STAT1和IRF,导致IRF2与CD279 (PD-1) 促进体结合.
- STAT1与IRF2促进体结合,而IRF2与CD279促进体结合.
- 在结肠癌患者的瘤透髓状细胞中,STAT1,IRF2和PDCD1的表达正相关.
结论:
- IFNβ诱导骨髓状细胞中的PD-1表达,至少部分是通过自身隐性机制.
- 信号轴pSTAT1-IRF2对于IFNβ介导的PD-1在骨髓细胞中的上调至关重要.
- 这些发现揭示了瘤微环境中PD-1的新型调节途径.
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