Avaliação das atividades antinociceptiva, antiinflamatória e antipirética do extrato hidroalcoólico bruto de Alternanthera CF brasiliana (L) Kuntze em ratos

Abstract

Medicinal plants have always been used by man to solve health problems. This treatment is based mainly on observation of behavior of animals and plants in the front passage of the customs of its use from generation to generation. Many herbal medicines are currently used in therapy after his action proved scientifically, validating its use and effectiveness. Considering the high investments implemented by large conglomerates in the development of new pharmaceutical drugs and the discovery of these relatively slow, the plants are certainly sources little used for this purpose since there are few studies compared the number of species of flora. The aim of this study was to evaluate the activities antiinflammatory, antipyretic and antinociceptive of the crude extract of Alternanthera brasiliana (EAB) in the model of paw edema induced by carrageenan, in the model of fever induced by substance pirogência, lipopolysaccharide-LPS and the type of pain induced by formalin in rats, respectively. The testing of antipyretic activity, inhibition of EAB in the concentration of 40mg/kg occurred in two intervals: 4.5 h, inhibition of 31.4% and 6h, 35.7% reduction. Already at a concentration of 80 mg / kg was only the 6th time, 42.8%. The dose of 160mg/kg significantly inhibited the fever, 30.6%, only around 4.5 h after injection of LPS. The doses of 640 and 1280 mg / kg shown to be effective in reducing fever mainly between the 2nd and 6th hours, where the peak of inhibition at the 3rd hour (47% for lower dose and 35.2% for a dose of 1280 mg) . In results for the inhibition of edema caused by carrageenan was observed that doses of 640 and 1280mg/kg were effective in reducing the swelling between the 3rd and 5th hours, with peak inhibition of 36.8% in the 3rd time for the dose of 1280 mg and a decrease of 36.2% in the 4th h for the lower dose, showing results similar to antiinflammatory drug used as positive control, the indomethacin. The administration of the EAB test nociception at doses of 640 and 1280mg, showed significant inhibition on the number of shaken to paw in rats, both the neurogenic phase, between 0 and 5 min, and in the inflammatory phase, 15- 20 min, where the range of maximum inhibition occurred between 15-19 min for a dose of 640 mg, 70.6% and between 20-24 min for a dose of 1280 mg, 54.4%. This study indicates that the plant studied presented anti-inflammatory activity, antinociceptive and antipyretic.