Modern medical research indicates that hypochlorous acid (HClO) and peroxynitrite (ONOO-) are important biomarkers of oxidative stress. However, the up- or down-regulation of HClO or ONOO- has been closely associated with the occurrence and development of various diseases. In order to investigate the intrinsic entanglement relationship between HClO and ONOO- and their relationship with the occurrence and development of inflammation, it is very valuable to develop fluorescent sensors that are capable of displaying different signals towards HClO, ONOO- and HClO/ONOO-. In this work, we rationally design and construct a novel robust small organic molecule fluorescent sensor (RhNp-ClO-ONOO) towards ONOO-, HClO and HClO/ONOO- with green, red, and green-red three different fluorescent signal outputs, respectively. RhNp-ClO-ONOO has fast responsive time for HClO (∼60 s) and ONOO- (∼20 s). Also it has markedly low detection limits for HClO (∼25.3 nM) and ONOO- (12.4 nM) respectively. In addition, RhNp-ClO-ONOO could be further shown to detect endogenous HClO/ONOO- in living cells, inflammatory tissues and rat model successfully. Therefore, this novel fluorescent sensor with double responsive moiety can offer a powerful tool for studying the role of HClO and ONOO- and the occurrence and development of inflammatory diseases.
Keywords: Double responsive sites; Fluorescent sensor; Hypochlorous acid (HClO); Inflammation; peroxynitrite (ONOO(–)).
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