向复制叉处理与PARP抑制协同作用,以在同源重组熟练的卵巢癌中增强致命性
Ganesh Pai Bellare1,2, Kshama Kundu1, Papiya Dey1
1Bio-Organic Division, Bhabha Atomic Research Centre, Mumbai, 400085, India.
Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|March 16, 2025
概括
与多 (ADP-ribose) 聚合酶抑制剂 (PARPi) 结合的trans-4,4'-dihydroxystilbene (DHS) 显示出通过向复制应激和同源重组修复来治疗卵巢癌的前景. 这种组合有效地减少了瘤生长,毒性最小.
科学领域:
- 在瘤学瘤学.
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
背景情况:
- 用多 (ADP-ribose) 聚合酶抑制剂 (PARPi) 治疗同源重组 (HR) 缺乏癌症的合成致死性越来越多地与复制过程有关,而不仅仅是DNA修复.
- 将复制分叉处理与HR-downregulation一起定位为HR-proficient和PARPi-resistant瘤提供了一种策略.
- 众所周知,像白醇一样,斯蒂尔能调节复制和RAD51的表达.
研究的目的:
- 确定降低RAD51表达和同源重组 (HR) 修复的新型药物.
- 评估在卵巢癌模型中将一种新型stilbene,trans-4,4 - dihydroxystilbene (DHS),与PARPi结合的疗效.
- 阐明组合治疗的潜在作用机制.
主要方法:
- 使用GFP-reporter测试对一个stilbene库进行选,以识别影响RAD51表达和HR修复的化合物.
- 用DHS和talazoparib (PARPi) 治疗卵巢癌细胞的联合治疗.
- 对复制应激,单链DNA (ssDNA) 缺口,多ADP-ribosylation (PARylation) 和DNA双链断裂的评估.
- 在SCID小鼠中使用卵巢瘤异种移植的体内研究,以评估治疗疗效和毒性.
主要成果:
- 鉴定出trans-4,4 - dihydroxystilbene (DHS) 是一种强大的天然剂,可以降低RAD51表达和HR修复的调节.
- 在与talazoparib (PARPi) 结合时,DHS在卵巢癌中协同增强细胞死亡.
- 从机制上讲,DHS通过阻碍复制的进展和速度来诱导复制应激,导致ssDNA缺口和PARylation,这些缺口被PARPi强化,导致致命的双链断裂.
- 组合疗法显著抑制了卵巢瘤异体移植的生长,观察到的组织毒性最小.
结论:
- 变-4,4 - 二基乙烯 (DHS) 是一种强大的天然剂,可诱导复制应激并降低HR修复的调节.
- DHS和talazoparib (PARPi) 的组合在卵巢癌治疗中表现出显著的协同效果,向HR-proficient和潜在的PARPi抗性瘤.
- 这种组合疗法值得进一步研究,因为它是卵巢癌的新疗法策略,显示出有希望的疗效和有利的毒性概况.
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