Evaluation of anti-arthritic potential of Leonotis nepetifolia (L.)R.Br. against Freund’s adjuvant induced arthritis

Abstract

Background: Leonotis nepetifolia (L.)R.Br. (LN) belonging to Lamiaceae family is a tall erect annual weed native to Southern India and tropical Africa used by tribals and folklore traditions in India for cough, fever, stomach ache, skin ailments, kidney diseases, rheumatism and dysmenorrhoea. The purpose of the study is to evaluate the anti-arthritic activity of the traditional dosage form( decoction) as used by the tribals in comparison to a modified dosage form(dry aqueous extract ) of whole plant of LN in experimental animal models. Materials and Methods: Thirty wistar strain albino rats were selected and randomly divided into five groups. Arthritis was induced by Freund’s complete adjuvant (FCA) and then treated with either the decoction of whole plant of LN or the dry aqueous extract for 30 days.The various parameters like paw volume, ponderal changes, serum biochemical parameters and histopathological changes were assessed. The data was analyzed by employing one-way ANOVA followed by Dunnet’s multiple‘t’ test for unpaired data to determine significant difference between groups at P>0.05. Results: In the present study it was observed that dry aqueous extract form of the test drug is having weak activity against primary oedema whereas decoction form did not show any effect on primary oedema. Both forms of test drug have comparable values as standard drug on 25th day in secondary oedema. Conclusion: The findings suggest the beneficial effect of the drug against chronic inflammation and inhibition of periarthritis and osteogenic activity.