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Evidence-Based Complementary and Alternative Medicine
Volume 2013, Article ID 616241, 10 pages
http://dx.doi.org/10.1155/2013/616241
Research Article

Antinociceptive and Anti-Inflammatory Effects of Orally Administrated Denatured Naja Naja Atra Venom on Murine Rheumatoid Arthritis Models

1Department of Pharmacology and Laboratory of Aging and Nervous Diseases, Soochow University School of Pharmaceutical Sciences, 199 Ren Ai Road, Suzhou 215123, China
2Department of Pharmacy, Wuxi People's Hospital Affiliated to Nanjing Medical University, Wuxi 214073, China
3Department of Pharmacology, Nantong University School of Medicine, Nantong 226001, China

Received 28 December 2012; Accepted 13 February 2013

Academic Editor: Pradeep Visen

Copyright © 2013 Kou-Zhu Zhu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

To investigate the antinociceptive and anti-inflammatory activities of the denatured Naja Naja atra venom (NNAV) in rheumatoid arthritis-associated models, the denatured NNAV (heat treated; 30, 90, 270 μg/kg), the native NNAV (untreated with heat; 90 μg/kg), and Tripterygium wilfordii polyglycoside (TWP, 15 mg/kg) were administrated orally either prophylactically or therapeutically. We measured time of licking the affected paw in formaldehyde-induced inflammatory model, paw volume in egg-white-induced inflammation, and granuloma weight in formalin-soaked filter paper-induced granuloma. For adjuvant-induced arthritis (AIA) rats, paw edema, mechanical withdrawal threshold, serum levels of TNF-α and IL-10, and histopathological changes of the affected paw were assessed. We found that the denatured NNAV (90, 270 μg/kg) significantly reduced time of licking paw, paw volume, and granuloma weight in above inflammatory models and also attenuated paw edema, mechanical hyperalgesia, and histopathology changes in AIA rats. Additionally, the increase in serum TNF-α and the decrease in serum IL-10 in AIA rats were reversed by the denatured NNAV. Although the native NNAV and TWP rendered the similar pharmacological actions on the above four models with less potency than that of the denatured NNAV, these findings demonstrate that oral administration of the denatured NNAV produces antinociceptive and anti-inflammatory activities on rheumatoid arthritis.