Many inflammatory processes are associated with an increase in the production of reactive
oxygen species (ROS). Chemical probes that specifically detect ROS are potentially useful tools for
the early diagnosis of inflammatory diseases as well as cancer. Herein we have developed a library of
coumarin hybrids by condensation of various heterocyclic quaternary salts to a 7-hydroxycoumarin
scaffold. From our library we identified one benzothiazole-coumarin hybrid as a red-fluorescent
compound with emission maxima around 620 nm and a strong fluorogenic response. Furthermore, we
proved that this scaffold is suitable for the preparation of activatable probes, such as by modification with a boronate
group for selective sensing of hydrogen peroxide (H2O2). In vitro assays confirmed the reactivity and subsequent emission
of our probe upon incubation with H2O2 with good selectivity over different ROS and reactive nitrogen species (RNS) as
well as minimal toxicity in cells. Finally cell imaging experiments were performed in murine macrophages and validated
the utility of the activatable probe for the detection of H2O2 in living cells.
许多炎症过程都与活性氧(ROS)的产生增加有关。特异性检测 ROS 的
化学探针是早期诊断炎症性疾病和癌症的潜在有用工具。在这里,我们通过将各种杂环季盐缩合到 7-羟基
香豆素支架上,开发了一个
香豆素杂交化合物库。从我们的化合物库中,我们发现了一种
苯并噻唑-
香豆素杂化物,它是一种红色荧光化合物,最大发射波长在 620 纳米左右,具有很强的致荧光反应。此外,我们还证明了这种支架适用于制备可激活的探针,例如通过
硼酸基团的修饰来选择性地感知
过氧化氢(
H2O2)。体外实验证实了我们的探针在与 培养后的反应性和随后的发射性,对不同的 ROS 和活性氮物种 (RNS) 具有良好的选择性,而且对细胞的毒性极小。最后,在小鼠巨噬细胞中进行了细胞成像实验,验证了可激活探针在活细胞中检测 的实用性。