Anti-hyperalgesia effect of nanchelating based nano particle, RAc1, can be mediated via liver hepcidin expression modulation during persistent inflammation.

Rheumatoid arthritis (RA) is a chronic systemic inflammatory disorder accompanied with hyperalgesia, edema and pain. At least 30% of the patients failed to respond to the available treatments and medications, which yet have a lot of serious adverse effects on patients. So, using novel technologies to produce more efficient medications is needed. According to the role of iron manipulation in inflammatory process, we have synthetized RAc1 nano particle, which contains zinc and has iron chelating property. In the present study, we evaluated RAc1 nano particle effects on hyperalgesia and liver hepcidin and serum IL-1β and TNF-α expression levels during acute and chronic phases of adjuvant-induced inflammation in male rats and compared its effects with Deferoxamine.Complete Freund's adjuvant (CFA)-induced arthritis was caused by single subcutaneous injection of CFA into the rat's hind paw on day zero. RAc1 with 100, 200 and 400 ng/kg doses and deferoxamin with doses of 200 mg/kg after diluting in vehicles were administered daily (i.p.) during the 21 days of the study after CFA injection. Hyperalgesia, Edema, liver hepcidin and serum IL-1β and TNF-α expression levels were assessed on days 0, 7, 14 and 21 of the study.The results of this study indicated the role of RAc1 nano particle administration in reducing paw edema, thermal hyperalgesia, and liver hepcidin and serum IL-1β and TNF-α expression even in comparison with Deferoxamine during different phases of inflammation caused by CFA.It seems that RAc1 nano particle exerts its immune modulatory effects by decreasing liver hepcidin expression and serum IL-1β and TNF-α levels.