<scp>l</scp>-Selenomethionine reduces platinum(<scp>iv</scp>) anticancer model compounds at strikingly faster rates than<scp>l</scp>-methionine
作者:Shuying Huo、Jingran Dong、Shigang Shen、Yanli Ren、Changying Song、Jianzhong Xu、Tiesheng Shi
DOI:10.1039/c4dt01528b
日期:——
interactions with Pt(II) anticancer drugs have been characterized, but its redox reactions with platinum(IV) anticancer prodrugs have not been exploited. In this work, the oxidation of SeMet by Pt(IV) anticancer model compounds trans-[PtX2(CN)4]2− (X = Cl, Br) was characterized. A stopped-flow spectrometer was used to record the rapid scan spectra and to follow the reaction kinetics over a wide pH range. An overall
L-硒蛋氨酸(SeMet)是人类从饮食中获取的硒的主要形式,已被用作补充品,并表现出一些重要的功能,例如癌症预防和抗氧化防御。其与Pt(II)抗癌药的相互作用已被表征,但尚未开发出与Pt(IV)抗癌前药的氧化还原反应。在这项工作中,SeMet被Pt(IV)抗癌模型化合物的反式-[PtX 2(CN)4 ] 2-氧化(X = Cl,Br)被表征。停流光谱仪用于记录快速扫描光谱,并在较宽的pH范围内跟踪反应动力学。得出了整体的二级速率定律:-d [Pt(IV)] / d t = k '[Pt(IV)] [SeMet],其中k '属于观察到的二级速率常数。所述ķ '-pH概貌显示ķ '即使溶液的pH从0.25变化到10.5仅增加约6倍。氧化还原化学计量被确定为Δ[Pt(IV)] /Δ[SeMet] = 1:(1.07±0.07),表明SeMet被氧化为硒代蛋氨酸亚硒酸酯。通过高分辨率质谱分析明确鉴