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Objective To assess the effi cacy of human placental extract (HPE) in an animal model of rheumatoid arthritis (RA). Method We used (i) KRN C57BL/6 TCR transgenic x NOD mice (KBx/N) serum transfer arthritis and (ii) collageninduced arthritis (CIA) mice to evaluate the effi cacy of HPE (1 ul or 100 ul, intra-peritoneal, three times per week)on RA. Incidence, severity of arthritis, and hind-paw thickness were quantifi ed. Joint destruction was analyzed using modifi ed mammographic imaging. Histopathological analysis for infl ammation, cartilage, and osteoclasts was performed using Hematoxylin-eosin (H-E), safranin-O, and tartrate-resistant acidic phosphatase (TRAP). ELISAs were used for detection of various cytokines in serum and joint tissue. Results Th ere were no signifi cant diff erences in incidence of arthritis, clinical scores of arthritis, and hind-paw thickness between HPE-treated and vehicle-treated groups for up to 2 weeks in the KBx/N serum transfer arthritis model. Histopathological analysis also showed no diff erences 2 weeks after treatment. Levels of TNF-α, IL-1β, IL-6, IL-10, and RANKL in serum and joint tissues were similar in all groups. Furthermore, there were no diff erences in clinical, radiological, and histological parameters between HPE-treated and vehicle-treated group for 3 weeks in the CIA model. Conclusion Systemic treatment with HPE has no benefi cial eff ects on arthritis in animal models of RA. Th erefore,indiscreet use of HPE in RA should be forbidden.

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