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Springer, Revista Brasileira de Farmacognosia, 3(18), p. 344-349, 2008

DOI: 10.1590/s0102-695x2008000300006

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Evaluation of antinociceptive and antiinflammatory effects of Croton pullei var. glabrior Lanj. (Euphorbiaceae)

This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

Croton pullei var. glabrior Lanj. (Euphorbiaceae) ? uma liana, amplamente distribu?da na Floresta Amaz?nica. Na medicina popular, diversas plantas do g?nero Croton t?m sido utilizadas com fins terap?uticos em patologias que envolvem dor e inflama??o, o que justifica este trabalho. O objetivo deste estudo foi investigar as atividades antinociceptiva e do extrato metan?lico das folhas de C. pullei (MECP). O MECP reduziu, de forma dose-dependente, o n?mero de contor??es abdominais (1,2 %) em camundongos, sugerindo uma atividade antinociceptiva da planta. Por outro lado, o MECP n?o alterou significativamente a reatividade ao est?mulo t?rmico no teste da placa quente e a reatividade ? estimula??o qu?mica na primeira fase do teste da formalina, indicando um mecanismo n?o-opioid?rgico. O MECP reduziu a nocicep??o na segunda fase do teste da formalina, inibiu o edema de orelha induzido pelo ?leo de croton e reduziu a migra??o leucocit?ria no teste da peritonite induzida por carragenina, indicando uma atividade antiinflamat?ria. Apesar dos mecanismos respons?veis pelos efeitos da planta ainda n?o estarem completamente esclarecidos, estes resultados parecem justificar o uso medicinal potencial de Croton pullei var. glabrior Lanj. em patologias que envolvam dor e inflama??o. ; ABSTRACT: Croton pullei var. glabrior Lanj. (Euphorbiaceae) is a liana, vastly distributed in the Amazonian Forest. In the folk medicine, several plants of the Croton genus have been used with therapeutic purposes in pathologies that involve painful and inflammatory diseases which justify this work. The aim of this study was to investigate the antinociceptive and antiinflammatory activities of the C. pullei leaves methanol extract (MECP). MECP reduced in a dose-dependent manner the number of acetic acid-induced abdominal writhing (1.2%) in mice, suggesting an antinociceptive activity of the plant. On the other hand, MECP did not significantly modify the reactivity to the thermal stimulation in the hot-plate test and the reactivity to the chemical stimulation in the formalin test first phase, indicating a non-opioid mechanism. MECP reduced the formalin-induced nociception in the second phase, inhibited the croton oil-induced ear edema and reduced the leukocytes migration in the test of the carrageenan-induced peritonitis, indicating an antiinflammatory activity. Although the mechanisms that underlie these plant effects are not completely elucidated, these results appear to support the potential medicinal use of Croton pullei var. glabrior Lanj. against painful and inflammatory diseases.