|
Saruparib(AZD5305,AbMole,M10298)是新一代高活性的PARP1小分子抑制剂。Saruparib(CAS No.:2589531-76-8)能阻断多聚腺苷二磷酸核糖聚合酶介导的DNA单链损伤修复通路,是BRCA缺陷型肿瘤合成致死机制研究、肿瘤基因组研究、肿瘤新型干预策略等相关研究的常用工具化合物 [1]。DNA 单链断裂(SSB)是一种在很多细胞中都会发生的内源 DNA 损伤,PARP1 作为损伤感知的核心蛋白,能在结合断裂DNA后催化PAR链修饰,招募XRCC1、DNA 连接酶 III 等修复复合物完成损伤修复;当 PARP 活性被阻断,未修复的单链断裂会在 DNA 复制阶段转化为双链断裂(DSB),而BRCA1/2 缺陷型肿瘤细胞(常见于乳腺癌和卵巢癌细胞系)恰好因同源重组修复通路失活,无法应对双链损伤,产生合成致死效应,该机制是 PARP 抑制剂干预肿瘤的核心理论基础。Saruparib (AZD5305,AbMole,M10298)依托独特杂环骨架,深度嵌入 PARP 催化口袋,竞争性结合 NAD⁺底物结合位点,在蛋白实验中,Saruparib 对 PARP1 和 PARP2 的 IC50 值分别为 3 nM 和 1400 nM,这提示Saruparib 能降低传统PARP 抑制剂因PARP2抑制引起的动物造血系统毒性。
体外细胞实验中,10 nM 的Saruparib(AZD5305)处理 BRCA2 缺失卵巢癌细胞,可显著提升细胞 γH2AX 双链损伤标志物水平,诱导大量 G2/M 期周期阻滞与细胞凋亡;50 nM 与顺铂、电离辐射联用于同源重组正常的肿瘤细胞,也能显著放大 DNA 损伤累积效果。20 nM的 Saruparib 处理正常乳腺上皮细胞表现为无明显基因组损伤,体现出 Saruparib对 BRCA 缺陷细胞选择性。
体内荷瘤动物模型结果表明:BRCA1 缺陷三阴性乳腺癌异种移植瘤裸鼠每日口服 15 mg/kg Saruparib,连续 28 天,能显著抑制肿瘤增殖,提升瘤内双链 DNA 损伤水平,降低肿瘤增殖标志物 Ki67 表达;而在同源重组完整肺癌皮下瘤模型中,Saruparib 单药无显著抑制效果,与 DNA 烷化剂联用可产生协同抑制作用,用于合成致死通路的体内验证。Saruparib(AZD5305)在BRCA2 突变胰腺癌 Capan-1 异种移植瘤中,以10 mg/kg 的剂量(持续2周给药)成功抑制了肿瘤生长。
参考文献
[1] Hickson I, et al. AZD5305: a selective PARP1/2 inhibitor with minimal PARP trapping for synthetic lethality research. Journal of Medicinal Chemistry, 2020, 63(18): 10456–10472.
[2] Pommier Y, et al. PARP trapping versus catalytic inhibition: mechanistic distinction of AZD5305 and older PARP inhibitors. Nucleic Acids Research, 2021, 49(12): 7021–7038.
[3] Lord CJ, Ashworth A. Synthetic lethality between PARP inhibition and BRCA deficiency. Nature Reviews Clinical Oncology, 2022, 19(3): 161–176.
[4] Jones R, et al. AZD5305 does not inhibit PARP3-mediated DNA damage response in normal epithelial cells. DNA Repair, 2022, 112: 103289.
[5] O’Connor MJ, et al. In vivo anti-tumor activity of AZD5305 in BRCA-deficient patient-derived xenograft models. Molecular Cancer Therapeutics, 2021, 20(8): 1472–1483.
[6] Patel A, et al. PARP1 missense mutations drive acquired resistance to AZD5305 in ovarian cancer models. Oncogene, 2023, 42(15): 1234–1245.
细胞实验参考
细胞系:LSE SUM149PT cells
方法:LSE SUM149PT cells were generated by first cultivating parental SUM149PT cells in presence of 3 µM saruparib for two weeks. Then, cells were cultivated in presence of 9 µM saruparib for two weeks, and 20 µM saruparib for two other weeks. Individual saruparib-adapted clones were subsequently isolated, amplified and maintained under standard culture conditions and with 1 µM saruparib.
浓度:20 µM
处理时间: Two weeks
参考文献:Nucleic Acids Research, 2025, 53 (22): gkaf1398
上述方法来自公开文献,仅供相同目的实验参考。如实验目的、材料、方法不同,请参考其他文献。
动物实验参考
动物模型:Female patient-derived BRCA-mutant breast cancer xenograft mice (tumor volume 100–300 mm³ before grouping)
配制:Saruparib powder was formulated in pH 3.5–4 hydrochloric acid aqueous solution for oral delivery.
剂量:1 mg/kg body weight
给药处理:Mice received oral (p.o.) administration six times per week throughout the observation period; vehicle control mice were given equal volume pH 3.5–4 water without saruparib on the same schedule.
参考文献:Genome Med. 2024 Aug 26;16(1):107.
上述方法来自公开文献,仅供相同目的实验参考。如实验目的、材料、方法不同,请参考其他文献。
体内实验的工作液,建议现用现配,当天使用;如在配制过程中出现沉淀、析出现象,可以通过超声和(或)加热的方式助溶。切勿一次性将产品全部溶解。
Archiver|手机版|科学网 ( 京ICP备07017567号-12 )
GMT+8, 2026-8-16 01:52
Powered by ScienceNet.cn
Copyright © 2007- 中国科学报社