Cellular Fates of Manganese(II) Pentaazamacrocyclic Superoxide Dismutase (SOD) Mimetics: Fluorescently Labeled MnSOD Mimetics, X-ray Absorption Spectroscopy, and X-ray Fluorescence Microscopy Studies
作者:Claire M. Weekley、Isabell Kenkel、Rainer Lippert、Shengwei Wei、Dominik Lieb、Tiffanny Cranwell、Jason L. Wedding、Annika S. Zillmann、Robin Rohr、Milos R. Filipovic、Ivana Ivanović-Burmazović、Hugh H. Harris
DOI:10.1021/acs.inorgchem.6b03073
日期:2017.6.5
SOD-active manganese(II) phosphate. Higher phosphate binding constants, determined from the effect of the phosphate concentration on in vitro SOD activity, were associated with more extensive metabolism of the amine-based MnPAMs to manganese(II) phosphate. In contrast, the imine-based manganese(II) pydiene complex that is prone to hydrolysis was entirely decomposed after uptake and free manganese(II) was
锰(II)五氮杂大环配合物(MnPAMs)可以用作锰超氧化物歧化酶(MnSOD)的小分子模拟物,在与氧化应激有关的疾病中具有潜在的治疗应用。以前,已经确定了体外作用机制,已经在细胞中证明了它们的活性,并且这类MnSOD模拟物的一些代表已经进入临床试验。但是,MnPAM在细胞中的吸收,分布和代谢在很大程度上尚不清楚。因此,我们已经使用X射线荧光显微镜(XFM)和X射线吸收光谱(XAS)来研究许多MnPAM的细胞命运。我们还合成和表征荧光标记(芘和罗丹明)锰(II)pyane [锰(II)反-2,13-二甲基-3,6,9,12,18-五氮杂双环[12.3.1] octadeca-1(18),14,16-三烯]衍生物,并研究了其在MnPAMs细胞成像中的用途。它们的SOD活性是通过直接停止流技术确定的。XFM实验表明,与对照细胞中锰的生理水平相比,用胺基锰(II)吡喃型五氮杂大环化合物处理可使总