Analgesic activity of a triterpene isolated from Scoparia dulcis L. (vassourinha)

Memórias do Instituto Oswaldo Cruz

Sonia M. F. Freire²  Luce M. B. Torres¹  Nidia F. Roque¹  Caden Souccar¹  Antonio J. Lapa¹ 

[1] ,UFMA Departamento de Fisiologia São Luis,Brasil

关键词: Scoparia dulcis L;    analgesia;    anti-inflammatory;    medicinal plant;   

DOI  :  10.1590/S0074-02761991000600034

来源: SciELO

【 摘 要 】

Analgesic and anti-inflammatory activities of water (WE) and ethanolic (EE) extracts of Scoparia dulcis L. were investigated in rats and mice, and compared to the effects induced by Glutinol, a triterpene isolated by purification of EE. Oral adminsitration (p.o.) of either WE or EE(up to 2 g/Kg) did not alter the normal spontaneous activity of mice and rats. The sleeping time induced by sodium pentobarbital (50 mg/Kg, i.p.) was prolonged by 2 fold in mice pretreated with 0.5 g/Kg EE, p.o. Neither extract altered the tail flick response of mice in immersion test, but previous administration of EE (0.5 g/Kg, p.o.) reduced writhings induced by 0.8% acetic acid (0.1 ml/10 g, i.p.) in mice by 47% EE (0.5 and 1 g/Kg, p.o.) inhibited the paw edema induced by carrageenan in rats by respectively 46% and 58% after 2 h, being ineffective on the paw edema induced by dextran. No significant analgesic or anti-edema effects were detected in animals pretreated with WE (1 g/Kg, p.o.). Administration of Glutinol (30 mg/Kg, p.o.) reduced writhing induced by acetic acid in mice by 40% and the carrageenan induced paw edema in rats by 73%. The results indicate that the analgesic activity of S dulcis L. may be explained by explained by an anti-inflammatory activity probably related to the triterpene Glutinol.

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