PD-1的拼接异型促进瘤进展,作为潜在的免疫检查点
Xuetong Wang1,2,3, Tongfeng Liu3,4, Yifei Li3,5
1School of Biomedical Engineering (Suzhou), Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, China.
Nature communications
|October 22, 2024
概括
一种新发现的编程细胞死亡1 (PD-1) 拼接异型,PD-1^28,抑制T细胞功能. 这种免疫检查点可能会驱动癌症的免疫逃生和对当前疗法的抵抗力.
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1 (PD-1) 是一个关键的免疫检查点受体,它调节T细胞反应,在癌症免疫逃避中至关重要.
- 在癌症免疫和免疫逃生中,PD-1的替代拼接异型的作用仍然在很大程度上未被探索.
研究的目的:
- 确定和描述参与免疫调节的新型PD-1拼接异型.
- 研究一种新发现的PD-1异型 (PD-1^28) 在T细胞功能和瘤生长中的功能作用.
主要方法:
- 使用分子生物学技术识别PD-1拼接异型.
- 对T细胞和瘤透淋巴细胞中PD-1^28表达的分析.
- 实验室功能测试以评估PD-1^28对T细胞增殖,细胞因子产生和细胞毒性活性的影响.
- 在体内研究中,使用合成的小鼠瘤模型和人性化的NOG小鼠来评估PD-1^28对瘤生长的影响.
主要成果:
- 鉴定出一种称为PD-1^28的人类PD-1的替代拼接异型,该异型具有从内子2的28个基对延伸.
- PD-1^28在外围T细胞和瘤透性淋巴细胞中表达,其表达因T细胞激活而诱导,并由TAF15调节.
- 在体外,PD-1^28显著抑制了T细胞的增殖,细胞因子的产生和瘤细胞的杀死.
- 在体内,PD-1^28的T细胞特异表达促进了小鼠模型中的瘤生长,包括那些具有人类肺癌细胞的小鼠模型.
结论:
- 该PD-1^28异形作为免疫检查点,抑制T细胞介导的抗瘤免疫力.
- PD-1^28可能代表癌症免疫逃逸的新机制.
- 这种异型可能有助于抵抗现有的免疫检查点阻塞疗法,建议它作为治疗点.
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