Qingwen Hufei Granules Attenuate Lipopolysaccharide-Induced Acute Lung Injury by Suppressing NLRP3 Inflammasome-Dependent Pyroptosis.

BACKGROUND

Currently, clinical treatments for ALI include vasodilators, glucocorticoids, and mechanical ventilation; however, these therapies are associated with various adverse reactions. Therefore, there is a need to develop safer and more effective treatment options. Traditional Chinese Medicine (TCM), particularly Qingwen Hufei Granules (QHG), has demonstrated efficacy in treating respiratory disorders, including upper respiratory tract infections and influenza. However, the active components and mechanism of action of QHG remain unclear.

METHODS

Lipopolysaccharide (LPS) induced ALI mouse model. We analyzed the main pharmacodynamic components of QHG by HPLC, determined the effects of QHG on the cell viability and inflammatory factors of RAW264.7 cells, and recorded the body weight and lung tissue wet/dry (W/D) of ALI mice. Inflammatory factors in bronchoalveolar lavage fluid (BALF), serum, and lung tissue were determined using ELISA, and the protective effect of hematoxylin and eosin (H&E) staining of lung tissue was studied. Transcriptomic, qRT-PCR, Western blotting, immunohistochemistry, and immunofluorescence analyses were used to analyze QHG and explore the mechanism of ALI damage reduction.

RESULTS

The findings demonstrated that QHG effectively mitigated inflammatory cell invasion and pulmonary edema. Moreover, it diminished the concentrations of IL-6, TNF-α, and IL-1β in lung tissue, serum, and BALF. Furthermore, QHG notably decreased the levels of NO, reactive oxygen species(ROS), IL-6, IL-1β, and TNF-α in the supernatants of RAW264.7 cells. Transcriptomic analysis of the lung tissue revealed that QHG primarily enriched the NOD-like receptor (NLR) signaling pathway. qRT-PCR, Western blotting, immunohistochemistry, and immunofluorescence experiments confirmed that QHG mitigated ALI damage through the NLR signaling pathway. Furthermore, seven key components in QHG were determined by using HPLC.

CONCLUSION

Our study demonstrated that QHG effectively mitigated LPS-induced ALI, and provided preliminary insights into its mechanism of action and material basis.