Da-Yuan-Yin decoction suppresses NETs formation, inhibits the IL-23/JAK2/STAT3 signalling pathway, and modulates metabolic profiles and gut microbiota composition in damp-heat syndrome

Abstract Background: Da-Yuan-Yin Decoction (DYY), used since the early Qing Dynasty in China for damp-heat syndrome, was evaluated for its comprehensive protective effects. Materials and methods: Rats received a high-fat/high-sugar diet for 14 days, then daily exposure to high temperature/humidity (31.0 ± 0.5°C, 85%-95%) for 10 hours over 14 days. Damp-heat syndrome was induced on day 29 via intraperitoneal lipopolysaccharide (LPS) injections (1 mg/kg and 0.5 mg/kg after 4 hours). Two hours post-modeling, rats received DYY (400 or 800 mg/kg/day)