Understanding the Selectivity of a Multichannel Fluorescent Probe for Peroxynitrite Over Hypochlorite
作者:Quanjuan Zhang、Na Zhang、Yi-Tao Long、Xuhong Qian、Youjun Yang
DOI:10.1021/acs.bioconjchem.5b00396
日期:2016.2.17
Peroxynitrite is a prominent biological reactive nitrogen species from radical combination of nitric oxide and superoxide and fundamentally involved in broad spectrum physiological and pathological processes. Though redox-inert itself, peroxynitrite anion (OONO–) attacks various biological electrophiles to generate an array of potent 2-e– or 1-e– oxidants, which result in cell injuries. Development of fluorescent probes for peroxynitrite, free from interference from hypochlorite, has been an active endeavor of the chemical community. We previously reported a peroxynitrite probe (PN600), which could differentiate hypochlorite from peroxynitrite through a multichannel signaling mechanism. Herein, this intriguing selectivity was accounted for through a structure–reactivity relationship study. Also, this work, together with rich literature contributions, has allowed a qualitative guideline in the use of electron-rich aromatic moieties to design probes against peroxynitrite and/or hypochlorite. The viability of this guideline was further testified by development of another list of peroxynitrite selective probes.
过氧亚硝酸盐是一种显著的生物活性氮物种,源自一氧化氮和超氧化物的自由基结合,并根本参与广泛的生理和病理过程。虽然本身不具氧化还原惰性,但过氧亚硝酸盐阴离子(OONO–)攻击各种生物亲电体,生成一系列强效的2-电子或1-电子氧化剂,导致细胞损伤。开发不受次氯酸盐干扰的过氧亚硝酸盐荧光探针,一直是化学界的热门课题。我们此前报道了一种过氧亚硝酸盐探针(PN600),该探针通过多通道信号机制能区分次氯酸盐和过氧亚硝酸盐。在此,通过结构-反应性关系研究,解释了这种有趣的特异性。此外,这项工作结合丰富的文献贡献,提供了一个定性指导原则,即利用富电子芳香族基团设计针对过氧亚硝酸盐和/或次氯酸盐的探针。通过开发另一系列选择性过氧亚硝酸盐探针,进一步验证了该指导原则的可行性。