A smart mitochondria-targeting TP-NIR fluorescent probe for the selective and sensitive sensing of H2S in living cells and mice†
Abstract
Hydrogen sulfide (H2S) is one of the important gaseous signalling molecules, which plays key roles in various critical biological processes. In this work, we report a novel two-photon near-infrared (TP-NIR) fluorescent probe (MNIR-H2S) for the sensing of mitochondrial H2S in living cells, tissues, zebrafish and nude mice. Using a xanthene dye as a TP-excitation (810 nm) NIR-emission (668 nm) fluorophore, a well-known H2S response moiety with a robust intramolecular charger transfer (ICT) effect can quickly respond to H2S and effectively quench the fluorescence intensity, and an oxonium cation structure serves as a mitochondria-targeting site. Notably, MNIR-H2S displays high sensitivity, high selectivity, low cytotoxicity, powerful mitochondrial localization ability, deep tissue penetration, and a very minimal imaging background. Biological imaging results show the biological application of MNIR-H2S as a robust new tool for use in H2S imaging in biological systems.