Evaluating the Effect of Hydrogen Sulfide in the Idiopathic Pulmonary Fibrosis Model with a Fluorescent Probe.

Hydrogen sulfide (H2S), a gaseous signaling molecule, is involved in a wide range of physiological and pathological processes. H2S has been proven to play a beneficial role in lung diseases, and the relationship between perturbations in endogenous H2S synthesis and degree with idiopathic pulmonary fibrosis (IPF) has attacted increasing attention. However, the changes in endogenous lung H2S levels in the pathological progression of chronic pulmonary diseases remain unclear. To this end, we synthesized a fluorescent probe (Bcy-HS) for the selective imaging of H2S in living cells and mice. This probe was mainly used for in situ in vivo and cellular imaging as well as a systematic assessment of intrapulmonary H2S levels at different stages of IPF. In addition, we also discussed the potential of H2S supplementation in the treatment of pulmonary fibrotic diseases. Our results confirmed the key role of H2S in pulmonary fibrosis. In cellular and mice models of pulmonary fibrosis, intracellular H2S levels are reduced. However, the severity of oxidative damage and pulmonary fibrosis decreased after NaSH (H2S donor). Therefore, we concluded that increasing the H2S content in vivo may be a novel strategy for IPF treatment.