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-