Journal of ethnopharmacology · 2026
Ganoderic Acid A alleviates ulcerative colitis by inhibiting the interleukin17 signaling pathway via targeting retinoic acid-related orphan receptor alpha.
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Ye Yifei, Chen Yinni, Cao Yiyang, Liu Tongzhan, Hu Yu, Chen Xi, Han Xiangnuo, Yang Shu, Li Shun, Chen Yuanli, Jiang Meixiu
Аннотация
ETHNOPHARMACOLOGICAL RELEVANCE: Ulcerative colitis (UC), a chronic inflammatory bowel disease, poses a significant global public health burden, a challenge compounded by the limited availability of effective treatments. Ganoderic acid A (GAA), which is a unique secondary metabolite in Ganoderma lucidum, has demonstrated anti-inflammatory, anti-tumor, antioxidant, and lipid-lowering activities. However, the role and mechanism of GAA in UC are not fully understood.
AIM OF THE STUDY: In this study, we aimed to explore the role and involved mechanisms of GAA in UC.
MATERIALS AND METHODS: We established a dextran sulfate sodium (DSS)-induced UC mouse model to investigate the therapeutic efficacy of GAA in mitigating inflammation and UC.
RESULTS: We found that GAA treatment significantly reduced DSS-induced weight loss, colon weight and length reduction, and decreased inflammatory cytokines, while repairing the intestinal epithelial barrier by increasing the expression of tight junction proteins (zonula occludens-1, occludin) and adherent junction protein (α-catenin), suggesting that GAA attenuated DSS-induced UC. Mechanistically, transcriptome sequencing analysis, along with in vivo and in vitro experiments have shown that GAA inhibited the interleukin (IL)-17 signaling pathway. Moreover, we have identified retinoic acid-related orphan receptor alpha (RORA) as a target of GAA through website prediction, molecular docking, and cell thermal shift assay experiments, and further confirmed that GAA inhibited Th17 cells from secreting IL-17 and reduced the polarization of macrophages towards M1 type by decreasing RORA expression.
CONCLUSIONS: Our findings disclose that GAA alleviated DSS-induced UC by inhibiting the IL-17 signaling pathway via targeting RORA to reduce inflammation. Our study suggests that GAA holds potential as a nutritional intervention for the prevention and treatment of UC.
AIM OF THE STUDY: In this study, we aimed to explore the role and involved mechanisms of GAA in UC.
MATERIALS AND METHODS: We established a dextran sulfate sodium (DSS)-induced UC mouse model to investigate the therapeutic efficacy of GAA in mitigating inflammation and UC.
RESULTS: We found that GAA treatment significantly reduced DSS-induced weight loss, colon weight and length reduction, and decreased inflammatory cytokines, while repairing the intestinal epithelial barrier by increasing the expression of tight junction proteins (zonula occludens-1, occludin) and adherent junction protein (α-catenin), suggesting that GAA attenuated DSS-induced UC. Mechanistically, transcriptome sequencing analysis, along with in vivo and in vitro experiments have shown that GAA inhibited the interleukin (IL)-17 signaling pathway. Moreover, we have identified retinoic acid-related orphan receptor alpha (RORA) as a target of GAA through website prediction, molecular docking, and cell thermal shift assay experiments, and further confirmed that GAA inhibited Th17 cells from secreting IL-17 and reduced the polarization of macrophages towards M1 type by decreasing RORA expression.
CONCLUSIONS: Our findings disclose that GAA alleviated DSS-induced UC by inhibiting the IL-17 signaling pathway via targeting RORA to reduce inflammation. Our study suggests that GAA holds potential as a nutritional intervention for the prevention and treatment of UC.