Discovery of a Redox-Activatable Chemical Probe for Detection of Cyclooxygenase-2 in Cells and Animals.

Discovery of a Redox-Activatable Chemical Probe for Detection of Cyclooxygenase-2 in Cells and Animals.
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DOI:
10.1021/acschembio.1c00961
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发表时间:
2022-07-15
影响因子:
4
通讯作者:
Marnett LJ
Marnett LJ
中科院分区:
生物学2区
文献类型:
--
作者:
Uddin MJ;Lo JH;Oltman CG;Crews BC;Huda T;Liu J;Kingsley PJ;Lin S;Milad M;Aleem AM;Asaduzzaman A;McIntyre JO;Duvall CL;Marnett LJ

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环氧合酶-2 (COX-2) 表达在炎症组织和许多癌前和恶性肿瘤中上调。因此,体内 COX-2 蛋白的评估有望成为在复杂疾病环境中区分病理细胞与正常细胞的有力策略。在此,我们报告了第一个可氧化还原激活的 COX-2 探针氟考昔 Q (FQ),用于发病机制的体内分子成像。 FQ 在纯化酶和基于细胞的检测中选择性抑制 COX-2。 FQ 表现出极低的荧光,并在暴露于氧化还原环境时显示出时间和浓度依赖性的荧光增强。 FQ 自由进入细胞并与 COX-2 酶结合。 FQ 表现出高循环半衰期和代谢稳定性,足以在靶位点积累,并显示出 COX-2 靶向摄取并保留在癌细胞和病理组织中。一旦被吸收,它就会经历氧化还原介导的转化为荧光化合物 (FQ-H),从而产生高信噪比,并区分病理组织和非病理组织,以进行实时体内成像。
Cyclooxygenase-2 (COX-2) expression is up-regulated in inflammatory tissues and many premalignant and malignant tumors. Assessment of COX-2 protein in vivo, therefore, promises to be a powerful strategy to distinguish pathologic cells from normal cells in a complex disease setting. Herein, we report the first redox-activatable COX-2 probe, fluorocoxib Q (FQ), for in vivo molecular imaging of pathogenesis. FQ inhibits COX-2 selectively in purified enzyme and cell-based assays. FQ exhibits extremely low fluorescence and displays time- and concentration-dependent fluorescence enhancement upon exposure to a redox environment. FQ enters the cells freely and binds to COX-2 enzyme. FQ exhibits high circulation half-life and metabolic stability sufficient for target site accumulation and demonstrates COX-2-targeted uptake and retention in cancer cells and pathologic tissues. Once taken up, it undergoes redox-mediated transformation into a fluorescent compound (FQ-H) that results in high signal-to-noise contrast and differentiates pathologic tissues from non-pathologic tissues for real time in vivo imaging.
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