Coumarin-based turn-on fluorescence probe with a large Stokes shift for detection of endogenous neutrophil elastase in live cells and zebrafish
作者:Qi Sun、Xiang Li、Yun Guo、Yuan Qiu、Xiaogang Luo、Genyan Liu、Yunfeng Han
DOI:10.1016/j.saa.2022.121563
日期:2022.11
Neutrophil elastase (NE), a serine proteinase, is a significant biomarker which is closely related to the progress of diseases. However, only few probes have been reported for detection of NE activity and cell imaging. And these probes have exhibited small Stokes shift, which leads to high fluorescence interferences. Furthermore, only one probe among them is able to image NE in vivo successfully. To
中性粒细胞弹性蛋白酶(NE)是一种丝氨酸蛋白酶,是与疾病进展密切相关的重要生物标志物。然而,只有少数探针被报道用于检测 NE 活性和细胞成像。并且这些探针表现出小的斯托克斯位移,这会导致高荧光干扰。此外,其中只有一种探针能够成功地在体内对 NE 进行成像。为了克服上述问题,我们设计了一种具有大斯托克斯位移的新型香豆素荧光探针HNCOU-NE,以可视化活细胞和斑马鱼中的 NE 活性。用于 NE的新探针HNCOU-NE包含作为报告基因的荧光团HNCOU和作为酶活性触发部分的五氟乙基。正如所料,HNCOU-NE表现出完美的NE传感检测性能,包括良好的水溶性、大的斯托克斯位移、高亲和力和宽线性响应浓度。此外,HNCOU-NE已成功用于不同活细胞的NE实时检测和成像,具有低细胞毒性和优异的生物相容性。最重要的是,内源性 NE 荧光成像实验表明,HNCOU-NE可以区分肝癌细胞(HepG2)和其他细胞(293T、HeLa