Abstract
Ulcerative colitis, a chronic inflammatory condition affecting the rectum and colon to varying degrees, is linked to a dysregulated immune response and the microbiota. Sodium (aS,9R)-3-hydroxy-16,17-dimethoxy-15-oxidotricyclo[12.3.1.12,6]nonadeca-1(18),2,4,6(19),14,16-hexene-9-yl sulfate hydrate (SDH) emerges as a novel diarylheptane compound aimed at treating inflammatory bowel diseases. However, the mechanisms by which SDH modulates these conditions remain largely unknown. In this study, we assessed SDH's impact on the clinical progression of dextran sodium sulfate (DSS)-induced ulcerative colitis. Our results demonstrated that SDH significantly mitigated the symptoms of DSS-induced colitis, reflected in reduced disease activity index scores, alleviation of weight loss, shortening of the colorectum, and reduction in spleen swelling. Notably, SDH decreased the proportion of Th1/Th2/Th17 cells and normalized inflammatory cytokine levels in the colon. Furthermore, SDH treatment modified the gut microbial composition in mice with colitis, notably decreasing Bacteroidetes and Proteobacteria populations while substantially increasing Firmicutes, Actinobacteria, and Patescibacteria. In conclusion, our findings suggest that SDH may protect the colon from DSS-induced colitis through the regulation of Th1/Th2/Th17 cells and gut microbiota, offering novel insights into SDH's therapeutic potential.
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