Hydrogen sulfide (HS) is an important gasotransmitter. Although a large number of fluorescent probes for cellular HS have been reported, only a few can detect HS in mitochondria, a cellular organelle connecting HS with mitochondrial function and metabolic pathways. We hereby describe a novel near-infrared fluorescent probe, nimazide, by introducing sulfonyl azide to the core structure of a QSY-21 dark quencher. Nimazide responded quickly to HS, resulting in robust fluorescence turn-off changes. This conversion displayed high specificity and fast kinetics. More impressively, we observed a robust fluorescence decrease in live cells loaded with mitochondrial nimazide in response to extracellular addition of nanomolar HS, and successfully imaged biologically generated mitochondrial HS in live mammalian cells. Nimazide is one of the most sensitive fluorescent probes for mitochondrial HS.
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| http://dx.doi.org/10.1021/acssensors.8b00142 | DOI Listing |
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