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Inhibitory effects of tubeimoside I on synoviocytes and collagen-induced arthritis in rats.
Journal of Cellular Physiology 2018 November
Advancements in rheumatoid arthritis (RA) therapies have shown considerable progresses in the comprehension of disease. However, the development of new potential medicines with relative safety and efficacy continues and natural compounds have been considered as alternatives or complementary agents to gain immense attractions. Tubeimoside I (TBMS I), a main triterpenoid saponin isolated from Bolbostemma paniculatum, has been reported to possess antiviral and anticancer effects. However, its effect on RA remains unknown. Here, we investigated the therapeutic effect of TBMS I in collagen-induced arthritis (CIA) rats and explored its underlying mechanism. Our results showed that TBMS I treatment efficaciously ameliorated inflammation and joint destruction of rats with CIA. In vitro studies revealed that TBMS I suppressed the production of pro-inflammatory cytokines including IL-1β, IL-6, IL-8 and TNFα, and downregulated the expression of MMP-9. In addition, TBMS I attenuated the destructive phenotypes of FLS of CIA rats including inhibiting proliferation and reducing migration rate. Further mechanistic analysis demonstrated that TBMS I suppressed TNFα-induced activations of NF-κB and MAPKs (p38 and JNK) leading to the downregulation of pro-inflammatory cytokines, which was beneficial to the anti-proliferative and anti-migratory activities of FLS cells. Taken together, TBMS I has a great potential to be developed into a novel therapeutic agent for the treatment of RA.
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