Exploring the Anti-Cancer Activity of Novel Thiosemicarbazones Generated through the Combination of Retro-Fragments: Dissection of Critical Structure-Activity Relationships
作者:Maciej Serda、Danuta S. Kalinowski、Nathalie Rasko、Eliška Potůčková、Anna Mrozek-Wilczkiewicz、Robert Musiol、Jan G. Małecki、Mieczysław Sajewicz、Alicja Ratuszna、Angelika Muchowicz、Jakub Gołąb、Tomáš Šimůnek、Des R. Richardson、Jaroslaw Polanski
DOI:10.1371/journal.pone.0110291
日期:——
Thiosemicarbazones (TSCs) are an interesting class of ligands that show a diverse range of biological activity, including anti-fungal, anti-viral and anti-cancer effects. Our previous studies have demonstrated the potent in vivo anti-tumor activity of novel TSCs and their ability to overcome resistance to clinically used chemotherapeutics. In the current study, 35 novel TSCs of 6 different classes were designed using a combination of retro-fragments that appear in other TSCs. Additionally, di-substitution at the terminal N4 atom, which was previously identified to be critical for potent anti-cancer activity, was preserved through the incorporation of an N4-based piperazine or morpholine ring. The anti-proliferative activity of the novel TSCs were examined in a variety of cancer and normal cell-types. In particular, compounds 1d and 3c demonstrated the greatest promise as anti-cancer agents with potent and selective anti-proliferative activity. Structure-activity relationship studies revealed that the chelators that utilized “soft” donor atoms, such as nitrogen and sulfur, resulted in potent anti-cancer activity. Indeed, the N,N,S donor atom set was crucial for the formation of redox active iron complexes that were able to mediate the oxidation of ascorbate. This further highlights the important role of reactive oxygen species generation in mediating potent anti-cancer activity. Significantly, this study identified the potent and selective anti-cancer activity of 1d and 3c that warrants further examination.
硫代氨基脲(TSCs)是一类有趣的配体,具有多种生物活性,包括抗真菌、抗病毒和抗癌作用。我们之前的研究已经证明,新型 TSCs 具有强大的体内抗肿瘤活性,并能克服临床使用的化疗药物的抗药性。在目前的研究中,我们利用在其他 TSCs 中出现的逆片段组合设计了 6 个不同类别的 35 种新型 TSCs。此外,通过加入基于 N4 原子的哌嗪或吗啉环,保留了 N4 原子末端的二取代,这在以前的研究中被认为是强效抗癌活性的关键。研究人员在多种癌症和正常细胞类型中考察了新型 TSCs 的抗增殖活性。其中,化合物 1d 和 3c 最有希望成为具有强效和选择性抗增殖活性的抗癌剂。结构-活性关系研究表明,利用氮和硫等 "软 "供体原子的螯合剂具有很强的抗癌活性。事实上,N,N,S 供体原子组对形成具有氧化还原活性的铁络合物至关重要,这种络合物能够介导抗坏血酸的氧化。这进一步凸显了活性氧生成在介导强效抗癌活性方面的重要作用。值得注意的是,这项研究发现了 1d 和 3c 的强效选择性抗癌活性,值得进一步研究。