Novel ATR/PARP1 Dual Inhibitors Demonstrate Synergistic Antitumor Efficacy in Triple‐Negative Breast Cancer Models

作者：Yuan Gao, Jiawei Zhou, Chenchen Wang, Zong‐Hao Wang, Nian‐Dong Mao, Ming He, Pengpeng Zhang, Huang Ping, G.H. Ye, Yuqing Zhang, Feng‐Hui Tang, Hang Zhang, Tian Xie, Xiang‐Yang Ye · 发表于：Advanced Science · 年份：2025 · DOI：10.1002/advs.202501916 · 被引用次数：12 · 研究领域：PARP inhibition in cancer therapy、DNA Repair Mechanisms、Cell death mechanisms and regulation

Abstract Concomitant inhibition of ataxia telangiectasia and Rad3‐related protein (ATR) and poly ADP‐ribose Polymerase (PARP) pathways is a promising strategy in cancer therapy, potentially expanding the clinical utility of ATR inhibitor (ATRi) and PARP inhibitor (PARPi). A novel series of ATR/PARP1 dual inhibitors is developed through the pharmacophore fusion of AZD6738 and Olaparib. Among them, B8 emerges as the most promising candidate, exhibiting potent ATR (IC 50 : 17.3 nM) and PARP1 (IC 50 : 0.38 nM) inhibition. B8 effectively reduced cell viability, induced apoptosis, and caused G2/M cell cycle arrest in TNBC cells. Additionally, B8 significantly impaired TNBC colony formation, migration, and invasion. Mechanistically, B8 induces DNA damage, evidenced by increased γ H2AX levels. In in vivo studies, B8 suppressed tumor growth more effectively than the combination in MDA‐MB‐468 xenografted mice, with no significant body weight loss. B8 also enhanced γ H2AX expression in tumor tissues. These findings confirm the synergistic effects of ATR/PARP1 co‐inhibition and highlight the potential of this novel inhibitor class for TNBC therapy.