Characterization of Radicals Formed Following Enzymatic Reduction of 3-Substituted Analogues of the Hypoxia-Selective Cytotoxin 3-Amino-1,2,4-Benzotriazine 1,4-Dioxide (Tirapazamine)
作者:Sujata S. Shinde、Andrej Maroz、Michael P. Hay、Adam V. Patterson、William A. Denny、Robert F. Anderson
DOI:10.1021/ja908689f
日期:2010.3.3
N-tert-butyl-alpha-phenylnitrone and observed using EPR. The highly oxidizing oxymethyl radical, from compound 5, was identified, and experimental spectra obtained for compounds 1, 2, 3, and 7 were well simulated after the inclusion of aryl radicals. The identification of a range of oxidizing radicals in the metabolism of the BTO compounds gives a new insight into the mechanism by which these HSPs can cause a wide
通过稳态辐射分解、脉冲辐射分解 (PR) 研究了 1,2,4-苯并三嗪 1,4-二氧化物 (BTO) 类生物还原性缺氧选择性前药 (HSP) 形成杀死癌细胞的反应性自由基的机制)、电子顺磁共振 (EPR) 和密度泛函理论 (DFT) 计算。Tirapazamine (TPZ, 3-amino BTO, 1) 和一系列 3-取代的类似物,-H (2)、-甲基 (3)、-乙基 (4)、-甲氧基 (5)、-乙氧基甲氧基 (6)、和-苯基(7)在厌氧稳态辐解条件下在水溶液中被还原,并且发现它们的自由基在甲酸离子存在下通过不同长度的短链反应去除底物。多个以碳为中心的自由基中间体,将化合物与富含细胞色素 P(450) 还原酶的微粒体厌氧培养后产生的 β 颗粒被 N-叔丁基-α-苯基硝酮捕获并使用 EPR 观察。鉴定了来自化合物 5 的高氧化性氧甲基自由基,并在包含芳基自由基后很好地模拟了化合物 1、2、3