PD1抑制细胞骨相关蛋白质的PKCθ依赖酸化和免疫突触形成
Daniela Chmiest1, Silvia Podavini1, Kalliopi Ioannidou2
1Department of Immunobiology, University of Lausanne, Epalinges, Switzerland.
Blood advances
|March 21, 2024
概括
编程细胞死亡蛋白1 (PD1) 抑制通过阻断蛋白激酶Cθ (PKCθ) 和维丁酸化,影响T细胞功能. 这表明维门丁酸化水平可以预测对基于PD1的癌症免疫疗法的反应.
科学领域:
- 免疫学 免疫学 免疫学
- 细胞生物学 细胞生物学
- 癌症研究 癌症研究
背景情况:
- 编程细胞死亡蛋白1 (PD1) 是癌症免疫疗法的关键标,但治疗反应各不相同.
- 了解PD1的细胞内机制对于开发更好的生物标志物至关重要.
- 目前对PD1下游信号通路的了解需要进一步阐明.
研究的目的:
- 为了研究受PD1参与人类T细胞影响的细胞内通路.
- 确定用于预测对基于PD1的癌症免疫疗法的反应的新生物标志物.
- 阐明蛋白激酶Cθ (PKCθ) 在PD1介导的T细胞抑制中的作用.
主要方法:
- 对初级人类T细胞的不偏见的蛋白质组分析.
- 评估PKCθ激活和免疫突触 (IS) 的形成.
- 对T细胞中维门丁酸化的分析和与肺癌中PD1配体 (PDL1) 水平的相关性.
主要成果:
- PD1触发了抑制的酸化和细胞骨蛋白与PKCθ的关联.
- 将PKCθ招募到IS的PD1阻断取决于SHP1/SHP2酸酶.
- 参与PD1导致突触酸化受损,IS形成较小.
- 由T细胞受体诱导的维门丁酸化被PD1抑制,这与肺癌中的PDL1水平相反相关.
结论:
- PKCθ及其基质维门丁是PD1-介导T细胞抑制的关键标.
- PD1信号破坏T细胞免疫突触的形成和功能.
- 维门丁酸化水平可以作为癌症患者PD1通路激活的预测生物标志物.
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