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ORIGINAL ARTICLE
Year : 2016  |  Volume : 12  |  Issue : 46  |  Page : 147-151

Protective effect of high molecular weight protein sub-fraction of Calotropis procera Latex in Monoarthritic Rats


1 Department of Plant Molecular Biology, Delhi University South Campus, Benito Juarez Road, Dhaula Kuan; Department of Pharmacology, All India Institute of Medical Sciences, Ansari Nagar, New Delhi, India
2 Department of Biochemistry and Molecular Biology, Federal University of Ceará, 60451-970 Fortaleza, CE, Brazil
3 Federal Institute of Education of Ceará State, Baturité-Ce CEP 62760-000, Brazil
4 Department of Pharmacology, All India Institute of Medical Sciences, Ansari Nagar, New Delhi, India

Correspondence Address:
Vijay L Kumar
Department of Pharmacology, All India Institute of Medical Sciences, Ansari Nagar, New Delhi - 110 029
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0973-1296.182151

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Background: Proteins present in the latex of Calotropis procera have been shown to produce anti-inflammatory effect and to afford protection in various disease models. Objectives: To determine the efficacy of high molecular weight protein sub-fraction (LPPI) of latex of C. procera in ameliorating joint inflammation and hyperalgesia in a preclinical model of arthritis. Materials and Methods: Monoarthritis was induced in rats by intra-articular injection of Freund's complete adjuvant (FCA) and the effect of two doses of LPPI (5 and 25 mg/kg) and diclofenac (5 mg/kg) was evaluated on joint swelling, stair climbing ability, motility, and dorsal flexion pain on day 3. The rats were sacrificed on day 3 to measure tissue levels of reduced glutathione (GSH) and thiobarbituric acid reactive substances (TBARS). Evaluation of joint histology was also made. Results: Intra-articular injection of FCA produced joint swelling and difficulty in stair climbing ability, motility, and pain on flexion of the joint as revealed by scores obtained for these functional parameters. LPPIproduced a dose-dependent decrease in joint swelling and improved joint functions. Arthritic rats also revealed altered oxidative homeostasis where joint tissue GSH levels were decreased and TBARS levels were increased as compared to normal rats. The levels of these oxidative stress markers were near normal in arthritic rats treated with LPPI. Moreover, treatment with LPPIalso maintained the structural integrity of the joint. The protective effect of LPPIwas comparable to the standard anti-inflammatory drug, diclofenac. Conclusion: The findings of the present study show that LPPIfraction comprising high molecular weight proteins could be used for the alleviation of arthritic symptoms. SUMMARY
  • High molecular weight protein sub.fraction of latex of Calotropis procera.(LPPI) reduced joint swelling and hyperalgesia in arthritic rats
  • LPPI produced a significant improvement in stair climbing ability and motility in arthritic rats
  • LPPI normalized the levels of oxidative stress markers in the arthritic joints
  • Treatment with LPPI reduced neutrophil influx and edema in the arthritic joints
Abbreviations used:FCA: Freund's complete adjuvant, GSH: Glutathione, TBARS: Thiobarbituric acid reactive substances, TBA: Thiobarbituric acid, MDA: Malondialdehyde, LPPI: Latex protein fraction PI.


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