Hyperoside exerts anti inflammatory and anti arthritic effects in LPS stimulated human fibroblast like synoviocytes in vitro and in mice with collagen induced arthritis
Aim:Hyperoside is a flavonol glycoside mainly found in plants of the genera Hypericum and Crataegus, which has shown anti oxidant, anti cancer and anti inflammatory activities. In this study, we investigated the effects of hyperoside on human rheumatoid fibroblast like synoviocytes (FLSs) in vitro and on mouse collagen induced arthritis (CIA) in vivo.Methods:FLSs were isolated from primary synovial tissues obtained from rheumatoid arthritis (RA) patients and exposed to LPS (1 mg/mL) Cell viability and proliferation were measured with MTT and BrdU assay. Cell migration was assessed using wound healing assay and Transwell assay. DNA binding of NF kB was measured using a TransAM NFkappaB kit. The localization of p65 subunit was detected with immunocytochemistry. CIA was induced in mice by primary immunization with Bovine Type II collagen (CII) emulsified in CFA, followed by a booster injection 3 weeks later. The arthritic mice were treated with hyperoside (25, 50 mg*kg 1*d 1, ip) for 3 weeks, and the joint tissues were harvested for histological analysis.Results:Hyperoside (10, 50, 100 mmol/L) dose dependently inhibited LPS induced proliferation and migration of human RA FLSs in vitro. Furthermore, hyperoside decreased LPS stimulated production of TNF a, IL 6, IL 1 and MMP 9 in the cells. Moreover, hyperoside inhibited LPS induced phosphorylation of p65 and IkBa, and suppressed LPS induced nuclear translocation of p65 and DNA biding of NF kB in the cells. Three week administration of hyperoside significantly decreased the clinical scores, and alleviated synovial hyperplasia, inflammatory cell infiltration and cartilage damage in mice with CIA.Conclusion:Hyperoside inhibits LPS induced proliferation, migration and inflammatory responses in human RA FLSs in vitro by suppressing activation of the NF kB signaling pathway, which contributes to the therapeutic effects observed in mice with CIA.
Acta Pharmacologica Sinica