Rational design of a reversible fluorescent probe for sensing GSH in mitochondria

Glutathione (GSH) is the most abundant biological thiol in cells. It can participate in metabolic processes, regulate the body's oxidation level and is essential for various cell functions. An abnormal concentration of glutathione in the cell is directly related to some diseases. Therefore, it is very important to develop fast, sensitive and reversible detection methods for GSH. Herein, we designed a reversible fluorescent probe (named GeP) for sensing GSH based on the nucleophilic addition and dissociation of intracellular GSH to GeP. The probe GeP showed a fast response time and a 20-fold fluorescence change toward GSH. It exhibited excellent mitochondrialtargeted performance and could be used to monitor GSH in mitochondria. Importantly, GeP could also enable superresolution fluorescence imaging of mitochondria through stochastic optical reconstruction microscopy.

Automated summary

In this study, a reversible fluorescent probe GeP was designed for detecting intracellular glutathione. The probe exhibited fast response and high fluorescence change, and could target mitochondria. Additionally, GeP enabled superresolution fluorescence imaging of mitochondria.