Fluorescent gallium and indium bis(thiosemicarbazonates) and their radiolabelled analogues: Synthesis, structures and cellular confocal fluorescence imaging investigations
Oxidative Release of Copper from Pharmacologic Copper Bis(thiosemicarbazonato) Compounds
作者:John J. Sirois、Lillian Padgitt-Cobb、Marissa A. Gallegos、Joseph S. Beckman、Christopher M. Beaudry、James K. Hurst
DOI:10.1021/acs.inorgchem.8b00853
日期:2018.8.6
2-Pyridylazoresorcinol complexation was used to demonstrate that Cu(II) release by reaction with peroxynitrite species involved rate-limiting homolysis of the peroxy O–O bond to generate secondary oxidizing radicals (NO2•, •OH, and CO3•–). Because the potentials for CuII(btsc) oxidation and reduction are ligand-dependent, varying by as much as 200 mV, it is clearly advantageous in designing therapeutic methodologies
从铜-双-硫代嘧啶铜氮杂铜络合物向细胞内递送治疗性或分析性铜的机制通常涉及内源性还原剂将单电子还原为Cu(I)类似物的机制,从而使金属离子不稳定且与bis--不牢固地配位。硫半脲(btsc)配体。但是,本文所述的电化学和光谱研究表明,Cu II(btsc)和Zn II ATSM(btsc =二乙酰基-双(4-甲基硫代半碳氮杂))复合物的单电子氧化在生理氧化剂范围内发生,导致还存在未被认可的铜释放的氧化途径。H 2 O 2氧化Cu II(btsc)由髓过氧化物酶或辣根过氧化物酶,HOCl和牛磺酸氯胺(它们主要是由MPO催化反应在活化的中性粒细胞中产生的氯化剂)以及过氧化亚硝酸盐类(ONOOH,ONOOCO 2 –)催化的被证明。与还原不同,氧化反应通过不可逆的配体氧化进行,最终释放出Cu(II)。2-吡啶基偶氮间苯二酚络合物用于证明通过与过氧亚硝酸盐类物质反应释放Cu(II)涉及限速过氧O-
Radical-Trapping Antioxidant Activity of Copper and Nickel Bis(Thiosemicarbazone) Complexes Underlies Their Potency as Inhibitors of Ferroptotic Cell Death
作者:Omkar Zilka、Jia-Fei Poon、Derek A. Pratt
DOI:10.1021/jacs.1c08254
日期:2021.11.17
inhibitor of (phospho)lipid peroxidation. In THF autoxidations, CuATSM reacts with THF-derived peroxyl radicals with kinh = 2.2 × 106 M–1 s–1─roughly 10-fold greater than α-tocopherol (α-TOH), Nature’s best RTA. Mechanistic studies reveal no H/D kinetic isotope effects and a lack of rate-suppressing effects from H-bonding interactions, implying a different mechanism from α-TOH and other canonical RTAs, which
在此我们证明了铜 (II)-二乙酰-双 ( N 4 -甲基氨基硫脲) (CuATSM) 是治疗 ALS 和帕金森病的临床候选药物,是一种高效的自由基捕获抗氧化剂 (RTA) 和 (phospho) 的抑制剂脂质过氧化。在 THF 自动氧化中,CuATSM 与 THF 衍生的过氧自由基反应,k inh = 2.2 × 10 6 M –1 s –1─大约是自然界最好的 RTA α-生育酚 (α-TOH) 的 10 倍。机理研究表明,没有 H/D 动力学同位素效应,并且缺乏 H 键相互作用的速率抑制效应,这意味着与 α-TOH 和其他典型 RTA 的机制不同,后者通过 H 原子转移 (HAT) 反应。对于相应的 Ni 2+络合物和 Cu 2+和 Ni 2+的络合物,观察到类似的反应性与其他双(氨基硫脲)配体。计算证实了限速 HAT 不能解释观察到的 RTA 活性的实验发现,而是表明可逆地向双(氨
Identification of differential anti-neoplastic activity of copper bis(thiosemicarbazones) that is mediated by intracellular reactive oxygen species generation and lysosomal membrane permeabilization
作者:Christian Stefani、Zaynab Al-Eisawi、Patric J. Jansson、Danuta S. Kalinowski、Des R. Richardson
DOI:10.1016/j.jinorgbio.2015.08.010
日期:2015.11
and disubstituted bis(thiosemicarbazones). This alkyl substitution pattern governed their: (1) CuII/I redox potentials; (2) ability to induce cellular 64Cu release; (3) lipophilicity; and (4) anti-proliferative activity. The potent anti-cancer Cu complex of the unsubstituted bis(thiosemicarbazone) analog, glyoxalbis(4-methyl-3-thiosemicarbazone) (GTSM), generated intracellular reactive oxygen species
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64的能力铜释放;(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)的有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而减弱有毒的铜螯合剂四硫代钼酸盐和抗氧化剂N-乙酰-1-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)。这项研究首次凸显了ROS和LMP在双(硫代半脲酮)的抗癌活性中的作用。
Unravelling the antitumoral potential of novel bis(thiosemicarbazonato) Zn(II) complexes: structural and cellular studies
作者:Elisa Palma、Hugo M. Botelho、Goreti Ribeiro Morais、Inês Rodrigues、Isabel Cordeiro Santos、Maria Paula Cabral Campello、Paula Raposinho、Ana Belchior、Susana Sousa Gomes、Maria Fátima Araújo、Isabel Correia、Nadia Ribeiro、Sofia Gama、Filipa Mendes、António Paulo
DOI:10.1007/s00775-018-1629-6
日期:2019.2
compounds based on bis(thiosemicarbazones) (BTSC) and on their coordination to metal centers constitutes a promising field of research. We have recently explored this class of ligands and their Cu(II) complexes for the design of cancer theranostics agents with enhanced uptake by tumoral cells. In the present work, we expand our focus to aliphatic and aromatic BTSC Zn(II) complexes bearing piperidine/morpholine
Modification of the chelate ring structure of technetium-99m(99mTc) dithiosemicarbazone (DTS) chelate was carried out in pursuit of a more stable and lipophilic compound. A new DTS chelating molecule, pentane-2, 4-dione bis(N-methylthiosemicarbazone) (PETS), with a 5-6-5 membered chelate ring stracture, was synthesized and labeled with 99mTc. PETS generated two 99mTc compounds as major products. Both had much higher stability and lipophilicity than a 5-5-5 membered 99mTc DTS compound, as well as great stability in plasma. Both 99mTc-PETS compounds were rapidly extracted by the brain and heart when injected into mice. Thus, the modified chelate ring structure afforded a preferable characteristics to DTS chelate as for the chelating site for technetium radiopharmaceuticals.