在低氧性癌细胞中选择性降解BRD4
Marta Serafini1, Sophie A Twigger2, George Delfas1
1Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K.
Journal of the American Chemical Society
|September 25, 2025
概括
科学家开发了低氧激活的PROTACs (HAP-TACs),用于向蛋白质降解. 这些新型分子在低氧瘤环境中被选择性地激活,减少潜在的毒性并使精确的癌症治疗成为可能.
科学领域:
- 药物发现
- 化学生物学
- 癌症学
背景情况:
- 化向基因组 (PROTACs) 使用近距离诱导进行向蛋白质降解.
- 由于非特异性蛋白质降解,目前的PROTAC应用面临剂量限制毒性的挑战.
- 环境依赖激活对于更安全,更有效的PROTAC疗法至关重要.
研究的目的:
- 在固体瘤中开发低氧激活的PROTACs (HAP-TACs).
- 设计在正常条件下不活跃的PROTAC,并通过低氧激活.
- 证明使用生物降解组进行条件激活的可行性.
主要方法:
- 在PROTAC的VHL或cereblon结合成分上附加了一个印乐基生物降解组.
- 这种修改降低了E3连接酶的亲和力,使PROTAC变得不活跃.
- 概念验证研究使用BRD4降解作为在不同氧气条件下的模型系统.
主要成果:
- 在低氧条件下选择性地降低了印乐基组.
- 这种减少释放了活性PROTAC,导致向蛋白质降解.
- 特别是在低毒环境中观察到BRD4降解,证明了HAP-TAC的有效性.
结论:
- 低氧激活的PROTACs (HAP-TACs) 在低氧固体瘤中提供了针对蛋白质降解的新策略.
- 这种方法可以使PROTAC的激活取决于环境,并可能减轻剂量限制的毒性.
- 该HAP-TAC平台可适应使用VHL或cereblon E3链酶的各种PROTAC.
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