核PD-L1在DNA损伤时触发与瘤相关的炎症
Naoe T Nihira1, Wenwen Wu1, Mitsue Hosoi1
1Department of Translational Oncology, St. Marianna University Graduate School of Medicine, Kawasaki, 216-8511, Japan.
核PD-L1激活DNA损伤反应通路,增强瘤中的炎症. 这一发现揭示了PD-L1影响瘤微环境和免疫逃避的新机制.
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:
- 针对PD-1/PD-L1的免疫检查点抑制剂在热瘤 (如三阴性乳腺癌) 中有效.
- 这些瘤中的构成性DNA损伤促进炎症和PD-L1表达以逃避免疫.
- 在调节DNA损伤反应和炎症方面,PD-L1的确切作用仍然在很大程度上是未知的.
研究的目的:
- 研究PD-L1在DNA损伤反应 (DDR) 和炎症中的功能.
- 阐明PD-L1影响瘤微环境的分子机制.
- 确定核PD-L1是否在DDR和炎症信号传递中发挥作用.
主要方法:
- 研究了PD-L1与ATR的相互作用及其在Chk1激活和染色体结合中的作用.
- 利用PD-L1删除和ATR/Chk1抑制剂来评估它们对DNA损伤反应通路的影响.
- 研究了核PD-L1局部化的作用,使用突变和抑制剂,如Santacruzamate A和C646.
- 评估了在基因毒性压力时诱导促炎性化学细胞因子的作用.
主要成果:
- 核PD-L1激活ATR-Chk1通路,在基因毒性压力时诱导促炎性细胞因子.
- PD-L1直接与ATR相互作用,对Chk1激活和染色体结合至关重要.
- 删除PD-L1或ATR/Chk1抑制抑制晚期cGAS-STING和NF-κB激活以及随后的化学细胞因子诱导.
- 抑制PD-L1核局部化会降低化学细胞因子的诱导,而加速局部化会增强它.
结论:
- 核PD-L1作为DNA损伤反应和炎症的关键调节者.
- 通过调节瘤微环境,PD-L1增强了"热瘤"的特性.
- 针对核PD-L1定位或其与ATR-Chk1相互作用可能提供新的治疗策略.
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