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首页> 外文期刊>Journal of Inorganic Biochemistry: An Interdisciplinary Journal >Identification of differential anti-neoplastic activity of copper bis(thiosemicarbazones) that is mediated by intracellular reactive oxygen species generation and lysosomal membrane permeabilization
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Identification of differential anti-neoplastic activity of copper bis(thiosemicarbazones) that is mediated by intracellular reactive oxygen species generation and lysosomal membrane permeabilization

机译:鉴定由细胞内活性氧物种产生和溶酶体膜通透性介导的双(硫代半氨基咔唑)铜的不同抗肿瘤活性

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Bis(thiosemicarbazones) and their copper (Cu) complexes possess unique anti-neoplastic properties. However, their mechanism of action remains unclear. We examined the structure-activity relationships of twelve bis(thiosemicarbazones) to elucidate factors regarding their anti-cancer efficacy. Importantly, the alkyl substitutions at the diimine position of the ligand backbone resulted in two distinct groups, namely, unsubstituted/monosubstituted and disubstituted bis(thiosemicarbazones). This alkyl substitution pattern governed their: (1) Cu-II/I redox potentials; (2) ability to induce cellular Cu-64 release; (3) lipophilicity; and (4) anti-proliferative activity. The potent anti-cancer Cu complex of the unsubstituted bis(thiosemicarbazone) analog, glyoxal bis(4-methyl-3-thiosemicarbazone) (GTSM), generated intracellular reactive oxygen species (ROS), which was attenuated by Cu sequestration by a non-toxic Cu chelator, tetrathiomolybdate, and the anti-oxidant, N-acetyl-L-cysteine. Fluorescence microscopy suggested that the anti-cancer activity of Cu(GTSM) was due, in part, to lysosomal membrane permeabilization (LMP). For the first time, this investigation highlights the role of ROS and LMP in the anti-cancer activity of bis(thiosemicarbazones). (C) 2015 Elsevier Inc. All rights reserved.
机译:双(硫代半脲)及其铜(Cu)配合物具有独特的抗肿瘤特性。但是,它们的作用机理仍不清楚。我们检查了十二个双(硫代半氨基甲酮)的结构活性关系,以阐明有关其抗癌功效的因素。重要的是,在配体主链的二亚胺位置上的烷基取代产生两个不同的基团,即未取代/单取代和二取代的双(硫代半咔唑酮)。这种烷基取代模式控制着它们:(1)Cu-II / I氧化还原电势; (2)诱导细胞Cu-64释放的能力; (3)亲脂性; (4)抗增殖活性。未取代的双(硫代半碳zone酮)类似物乙二醛双(4-甲基-3-硫代半碳zone酮)(GTSM)的强效抗癌铜络合物可生成细胞内活性氧(ROS),并通过非螯合的铜螯合作用减弱有毒的铜螯合剂四硫代钼酸盐和抗氧化剂N-乙酰基-L-半胱氨酸。荧光显微镜显示,Cu(GTSM)的抗癌活性部分归因于溶酶体膜通透性(LMP)。这项研究首次强调了ROS和LMP在双(硫代半脲酮)的抗癌活性中的作用。 (C)2015 Elsevier Inc.保留所有权利。

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