Thiazolidine Prodrugs as Protective Agents against γ-Radiation-Induced Toxicity and Mutagenesis in V79 Cells
作者:Britta H. Wilmore、Pamela B. Cassidy、Raymond L. Warters、Jeanette C. Roberts
DOI:10.1021/jm010162l
日期:2001.8.1
thiazolidine prodrugs exhibited less toxicity than their parent thiolamines, sometimes dramatically so. Protection against radiation-induced cell death was observed for the 2-alkylthiazolidine, 2(R,S)-D-ribo-(1',2',3',4'-tetrahydroxybutyl)thiazolidine (RibCyst), which produced a protection factor at 8 Gy of 1.8; the cysteine analogue, 2(R,S)-D-ribo-(1',2',3',4'-tetrahydroxybutyl)thiazolidine-4(R)-carboxylic
众所周知的辐射防护剂 L-半胱氨酸、半胱胺和 2-[(氨基丙基)氨基]乙硫醇 (WR-1065) 的两类噻唑烷前药形式的代表是通过将母体硫醇胺与合适的羰基供体缩合而合成的。使用克隆形成存活试验在 V79 细胞中评估前药的固有毒性。在暴露于 0--8 Gy 伽马 ((137) Cs) 辐射后,类似地测量了对辐射诱导的细胞死亡的保护。在次黄嘌呤鸟嘌呤磷酸核糖转移酶 (HGPRT) 位点测定抗诱变活性。所有噻唑烷前药的毒性均低于其母体硫胺素,有时毒性更大。观察到 2-烷基噻唑烷、2(R,S)-D-核糖-(1',2',3',4') 对辐射诱导的细胞死亡的保护作用 -四羟基丁基)噻唑烷 (RibCyst),其在 8 Gy 处产生的保护系数为 1.8;半胱氨酸类似物 2(R,S)-D-核糖-(1',2',3',4'-四羟基丁基)噻唑烷-4(R)-羧酸 (RibCys) 活性较低。RibCyst 还表现出优异的抗突变活性,可与