On the use of peroxy-caged luciferin (PCL-1) probe for bioluminescent detection of inflammatory oxidants in vitro and in vivo – Identification of reaction intermediates and oxidant-specific minor products
作者:Jacek Zielonka、Radosław Podsiadły、Monika Zielonka、Micael Hardy、Balaraman Kalyanaraman
DOI:10.1016/j.freeradbiomed.2016.07.023
日期:2016.10
first used to image hydrogen peroxide in living systems (Van de Bittner et al., 2010 [9]). Recently this probe was shown to react with peroxynitrite more potently than with hydrogen peroxide (Sieracki et al., 2013 [11]) and was suggested to be a more suitable probe for detecting peroxynitrite under in vivo conditions. In this work, we investigated in detail the products formed from the reaction between
过氧笼式荧光素(PCL-1)探针首先用于在生物系统中对过氧化氢成像(Van de Bittner等人,2010 [9])。最近,该探针与过氧亚硝酸盐的反应比与过氧化氢的反应更有效(Sieracki等,2013 [11]),被认为是在体内条件下检测过氧亚硝酸盐的更合适的探针。在这项工作中,我们详细研究了PCL-1与过氧化氢,次氯酸盐和过氧亚硝酸盐之间的反应形成的产物。HPLC分析表明,过氧化氢与PCL-1反应缓慢,形成萤光素是唯一的产物。次氯酸盐与PCL-1的次氯酸盐反应产生的萤光素明显减少,因为次氯酸盐将萤光素氧化成氯化的萤光素。PCL-1与过氧亚硝酸盐之间的反应由主要途径和次要途径组成。主要途径产生萤光素,次要途径产生自由基介导的硝化萤光素。自由基中间体的特征是自旋俘获。我们得出的结论是,除了在体内进行生物发光外,对氯化和硝化产物的监测还将有助于确定负责源自PCL-1的生物发光的氧化剂的性质。