Bioreductively Activatable Prodrug Conjugates of Combretastatin A-1 and Combretastatin A-4 as Anticancer Agents Targeted toward Tumor-Associated Hypoxia
作者:Blake A. Winn、Laxman Devkota、Bunnarack Kuch、Matthew T. MacDonough、Tracy E. Strecker、Yifan Wang、Zhe Shi、Jeni L. Gerberich、Deboprosad Mondal、Alejandro J. Ramirez、Ernest Hamel、David J. Chaplin、Peter Davis、Ralph P. Mason、Mary Lynn Trawick、Kevin G. Pinney
DOI:10.1021/acs.jnatprod.9b00773
日期:2020.4.24
The natural products combretastatin A-1 (CA1) and combretastatin A-4 (CA4) function as potent inhibitors of tubulin polymerization and as selective vascular disrupting agents (VDAs) in tumors. Bioreductively activatable prodrug conjugates (BAPCs) can enhance selectivity by serving as substrates for reductase enzymes specifically in hypoxic regions of tumors. A series of CA1-BAPCs incorporating nor-methyl
天然产物康维他汀A-1(CA1)和康维他汀A-4(CA4)充当微管蛋白聚合的有效抑制剂和肿瘤中的选择性血管分裂剂(VDA)。可生物还原活化的前药偶联物(BAPC)可以通过充当还原酶的底物来增强选择性,特别是在肿瘤的低氧区域。戴维斯(Mol。Cancer Ther。2006,5(11),2886)先前报道了一系列结合了正甲基,单甲基和gem-二甲基硝基噻吩触发器的CA1-BAPC和相应的CA4-BAPC。为了比较。与其去甲基43和单甲基44同类物相比,CA4-gem-二甲基硝基噻吩BAPC 45证明是示例性的。它在磷酸盐缓冲液(pH 7.4,24 h)中稳定,被NADPH-细胞色素P450氧化还原酶(POR)裂解(25%,90分钟),作为微管蛋白聚合的抑制剂(IC50> 20μM)没有活性(期望的前药属性),并且在A549细胞系中表现出低氧选择性激活[低氧细胞毒性比(HCR)= 41.5]。