Zinc(II)–Thiosemicarbazone Complexes Are Localized to the Lysosomal Compartment Where They Transmetallate with Copper Ions to Induce Cytotoxicity
作者:Alexandra E. Stacy、Duraippandi Palanimuthu、Paul V. Bernhardt、Danuta S. Kalinowski、Patric J. Jansson、Des R. Richardson
DOI:10.1021/acs.jmedchem.6b00238
日期:2016.5.26
imaging and live cell microscopy showed that the Zn(II) complex of our lead compound, di-2-pyridylketone 4-cyclohexyl-4-methyl-3-thiosemicarbazone (DpC), which is scheduled to enter clinical trials, was localized to lysosomes. Under lysosomal conditions, the Zn(II) complexes were shown to transmetallate with copper ions, leading to redox-active copper complexes that induced lysosomal membrane permeabilization
由于二-2-吡啶基酮硫代半碳酮(DpT)和2-乙酰基吡啶硫代半碳酮(ApT)系列在体内和体外均显示出强大的抗肿瘤活性,因此我们合成了它们的荧光锌(II)复合物以评估其在细胞内的分布。Zn(II)配合物通常在几种肿瘤细胞类型中显示出比单独的硫半脲高得多的细胞毒性。值得注意的是,特定的结构-活性关系证明了二-2-吡啶基药效团在其活性中的重要性。共聚焦荧光成像和活细胞显微镜检查表明,我们的先导化合物二-2-吡啶基酮4-环己基-4-甲基-3-硫代半碳酮(DpC)的Zn(II)配合物已定位在本地,已计划进入临床试验。溶酶体。在溶酶体情况下,Zn(II)配合物显示与铜离子发生金属转移,导致氧化还原活性的铜配合物诱导溶酶体膜通透性(LMP)和细胞毒性。这是第一个证明直接溶酶体靶向我们新型的Zn(II)-硫代半碳酸钠络合物的溶酶体靶向,该络合物通过与铜离子和LMP的重金属化介导其活性。