瘤细胞中的IFN I反应是由PARP7-p300/CBP相互作用通过明显的功能丧失和功能获取机制形成的
bioRxiv : the preprint server for biology
|July 9, 2025
概括
聚 (ADP-ribose) 聚合酶7 (PARP7) 通过修改共激活剂p300和CBP来调节I型干扰素 (IFN-β). PARP7 抑制剂通过双重机制诱导 IFN-β,包括功能丧失和功能增益效应.
科学领域:
- 在瘤学瘤学.
- 免疫学 免疫学 免疫学
- 分子生物学分子生物学
背景情况:
- 多 (ADP-ribose) 聚合酶7 (PARP7) 是一种单-ADP-ribosyl (MAR) 转移酶,可以抑制瘤细胞中的I型干扰素 (IFN-β).
- PARP7是经过验证的药物标,其抑制剂增加IFN-β的表达,但由于未知的基质,确切的机制尚不清楚.
研究的目的:
- 确定PARP7的核基质,并阐明PARP7抑制剂调节IFN-β表达的机制.
主要方法:
- 利用一种优化模拟敏感化学遗传 (ASCG) 方法来识别PARP7基质.
- 使用生物化学和细胞分析研究了PARP7,p300和CBP之间的相互作用.
- 评估了破坏PARP7-p300/CBP相互作用对结直肠癌细胞IFN-β表达的影响.
主要成果:
- 确定了p300和CBP作为核PARP7基质的联合激活剂.
- 在PARP7中发现了一个α-螺旋域,对于p300/CBP相互作用,MARylation和蛋白酶体降解至关重要.
- 证明破坏PARP7-p300/CBP相互作用可以抑制PARP7抑制IFN-β的作用.
- 观察到PARP7抑制剂以p300/CBP依赖的方式更有效地诱导IFN-β,而不是PARP7淘汰.
结论:
- PARP7通过MARylating p300/CBP调节IFN-β,这种相互作用对于抑制癌细胞中的IFN-β至关重要.
- PARP7 抑制剂通过双重机制诱导 IFN-β:抑制p300/CBP MARylation (功能丧失) 和稳定PARP7-p300/CBP复合体 (功能增加).
- 这些发现为PARP7抑制剂的机制及其在癌症免疫治疗中的潜力提供了新的见解.
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