A Dual-Modal Molecular Probe for Near-Infrared Fluorescence and Photoacoustic Imaging of Peroxynitrite
作者:Jianjian Zhang、Xu Zhen、Jianfeng Zeng、Kanyi Pu
DOI:10.1021/acs.analchem.8b01879
日期:2018.8.7
Peroxynitrite (ONOO–), a reactive and short-lived biological oxidant, is closely related with many pathological conditions such as cancer. However, real-time in vivo imaging of ONOO– in tumors remains to be challenging. Herein, we develop a near-infrared fluorescence (NIRF) and photoacoustic dual-modal molecular probe (CySO3CF3) composed of a water-soluble hemicyanine dye caged with a trifluoromethyl ketone moiety for in vivo imaging of ONOO–. The trifluoromethyl ketone moiety can undergo a series of ONOO–-induced cascade oxidation-elimination reactions, leading to sensitive and specific fluorescence and photoacoustic turn-on responses toward ONOO–; whereas, a zwitterionic structure of the hemicyanine component ensures good water-solubility. Thus, CySO3CF3 not only specifically detects ONOO– in solution and cells with the limit of detection down to 53 nM but also allows for NIRF and photoacoustic dual-modal imaging of ONOO– in the tumors of living mice.
过氧化亚硝酸盐(ONOO-)是一种活性短寿命生物氧化剂,与癌症等多种病理状况密切相关。然而,实时体内成像肿瘤中的ONOO-仍然具有挑战性。在此,我们开发了一种近红外荧光(NIRF)和光声双模分子探针(CySO3CF3),该探针由水溶性半胱氨酸染料和三氟甲基酮部分组成,用于体内成像ONOO-。三氟甲基酮部分可以发生一系列ONOO-诱导的级联氧化消除反应,从而对ONOO-产生敏感而特异的荧光和光声开启反应;而半胱氨酸成分的两性离子结构确保了良好的水溶性。因此,CySO3CF3不仅能够特异性检测溶液和细胞中的ONOO-,检测限低至53 nM,而且还可以对活体小鼠肿瘤中的ONOO-进行NIRF和光声双模成像。