Frontiers in pharmacology · 2026
Prim-O-glucosylcimifugin ameliorates DSS-induced ulcerative colitis via suppressing NLRP3 inflammasome activation.
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Wang Fuqian, Xiong Xin, Ruan Qingfeng, Zhang Dan, Huang Chuanqi, Xie Tingting, Cheng Lu
Аннотация
BACKGROUND: Ulcerative colitis (UC) is a chronic and relapsing inflammatory bowel disease (IBD), that lacks specific therapeutic drugs. Prim-O-glucosylcimifugin (POG), a furanochromone glycoside derived from Saposhnikovia divaricata, exhibits anti-inflammatory, antioxidant, and anti-inflammasome activities. It has also been shown to inhibit the activation of the NLR family pyrin domain containing 3 (NLRP3) inflammasome. Given that ulcerative colitis (UC) is a chronic inflammatory bowel disease characterized by intestinal barrier dysfunction and NLRP3 activation, this study aims to investigate the therapeutic effects and underlying mechanisms of POG in a murine model of UC induced by dextran sulfate sodium (DSS), and to evaluate its potential translational significance for UC intervention.
METHODS: A DSS-induced UC mouse model was employed to evaluate POG's therapeutic efficacy. Disease activity index, colon length, spleen index, and histopathological alterations of the colonic mucosa were assessed by H&E and AB-PAS staining, transmission electron microscopy, and immunofluorescence. Proinflammatory cytokines (TNF-α, IL-6, IL-18, IL-1β) were measured by ELISA, and NLRP3 inflammasome-related proteins were analyzed by Western blot.
RESULTS: POG treatment alleviated weight loss, colon shortening, splenomegaly, and inflammatory infiltration. It also restored goblet cell mucin droplets and tight junction proteins (Occludin, ZO-1, Claudin-1, MUC2), and reduced villi exfoliation. Serum levels of TNF-α, IL-6, IL-1β, and IL-18 were decreased. Western blot and ELISA revealed that POG suppressed NLRP3 inflammasome formation, inhibited GSDMD activation, and reduced cleavage and release of IL-1β and IL-18. Collectively, these findings indicate that POG not only attenuates inflammatory injury but also protects epithelial barrier structure and function, supporting its potential value in mechanism-based UC therapy development.
CONCLUSION: POG ameliorates experimental UC by inhibiting NLRP3 inflammasome activation, thereby mitigating colonic inflammation, preserving mucosal barrier integrity, and blocking downstream inflammatory responses. POG shows promise as a therapeutic agent for UC and provides a rationale for further preclinical optimization and future clinical translation.
METHODS: A DSS-induced UC mouse model was employed to evaluate POG's therapeutic efficacy. Disease activity index, colon length, spleen index, and histopathological alterations of the colonic mucosa were assessed by H&E and AB-PAS staining, transmission electron microscopy, and immunofluorescence. Proinflammatory cytokines (TNF-α, IL-6, IL-18, IL-1β) were measured by ELISA, and NLRP3 inflammasome-related proteins were analyzed by Western blot.
RESULTS: POG treatment alleviated weight loss, colon shortening, splenomegaly, and inflammatory infiltration. It also restored goblet cell mucin droplets and tight junction proteins (Occludin, ZO-1, Claudin-1, MUC2), and reduced villi exfoliation. Serum levels of TNF-α, IL-6, IL-1β, and IL-18 were decreased. Western blot and ELISA revealed that POG suppressed NLRP3 inflammasome formation, inhibited GSDMD activation, and reduced cleavage and release of IL-1β and IL-18. Collectively, these findings indicate that POG not only attenuates inflammatory injury but also protects epithelial barrier structure and function, supporting its potential value in mechanism-based UC therapy development.
CONCLUSION: POG ameliorates experimental UC by inhibiting NLRP3 inflammasome activation, thereby mitigating colonic inflammation, preserving mucosal barrier integrity, and blocking downstream inflammatory responses. POG shows promise as a therapeutic agent for UC and provides a rationale for further preclinical optimization and future clinical translation.