Piperine and piperine-loaded albumin nanoparticles ameliorate adjuvant-induced arthritis and reduce IL-17 in rats.

AIM

Rheumatoid arthritis (RA) is one of the most common chronic, inflammatory, autoimmune diseases affecting mainly the joints. Piperine (PIP), an alkaloid found in black pepper, has anti-inflammatory properties and its use in drug delivery systems such as nanoparticles might be a treatment for RA. This study aims to evaluate the possible anti-inflammatory and anti-arthritic effects of PIP and its use in albumin nanoparticles as a possible approach for the treatment of Adjuvant-induced arthritis (AIA) rats.

METHODS

PIP-loaded Bovine Serum Albumin nanoparticles (PIP-BSA NPs) were prepared using a desolvation method. AIA rats were given intraperitoneal injections of either 40 mg PIP or 131 mg PIP-BSA NPs every two days until day 28 when animals were sacrificed. Clinical score, histopathology, X-ray radiography, and serum levels of pro-inflammatory cytokines such as IL-1β, IL-17, and TNF-α were evaluated.

RESULTS

PIP and PIP-BSA NPs significantly reduced clinical scores, and alleviated inflammation within the joints. PIP was superior to PIP-BSA NPs for the alleviation of fibrin deposition and periosteal reactions while bone inflammation and erosion were less severe in the case of PIP-BSA NPs. Besides, both of the treatments suppressed serum levels of IL-17 in AIA rats (p = 0.003 and p = 0.02; respectively).

CONCLUSIONS

PIP and PIP-BSA NPs effectively alleviate the severity of AIA and suppress inflammation. Due to the superiority of PIP in improving fibrin deposition and periosteal reactions and the efficacy of PIP-BSA NPs in suppressing bone inflammation and erosion, their simultaneous use might be investigated.