| Autor: |
Inocêncio Leite LH; Programa de Pós-Graduação em Bioprospecção Molecular, Universidade Regional do Cariri, 63105-000 Crato, CE, Brazil., Leite Gde O; Programa de Pós-Graduação em Bioprospecção Molecular, Universidade Regional do Cariri, 63105-000 Crato, CE, Brazil., Silva Coutinho T; Programa de Pós-Graduação em Bioprospecção Molecular, Universidade Regional do Cariri, 63105-000 Crato, CE, Brazil., de Sousa SD; Programa de Pós-Graduação em Bioprospecção Molecular, Universidade Regional do Cariri, 63105-000 Crato, CE, Brazil., Sampaio RS; Programa de Pós-Graduação em Bioprospecção Molecular, Universidade Regional do Cariri, 63105-000 Crato, CE, Brazil., da Costa JG; Programa de Pós-Graduação em Bioprospecção Molecular, Universidade Regional do Cariri, 63105-000 Crato, CE, Brazil., de Menezes IR; Programa de Pós-Graduação em Bioprospecção Molecular, Universidade Regional do Cariri, 63105-000 Crato, CE, Brazil., Campos AR; Universidade de Fortaleza, Avenida Washington Soares 1321, 60811-905 Fortaleza, CE, Brazil. |
| Abstrakt: |
This study aimed to assess the possible topical antinociceptive activity of Vanillosmopsis arborea Baker essential oil (EOVA) and to clarify the underlying mechanism, using the acute model of chemical (eye wiping) nociception in mice. EOVA (25 to 200 mg/kg; p.o. and topical) evidenced significant antinociception against chemogenic pain in the test model of formalin-induced neuroinflammatory pain. Local application of 5 M NaCl solution on the corneal surface of the eye produced a significant nociceptive behavior, characterized by eye wiping. The number of eye wipes was counted during the first 30 s. EOVA (25, 50, 100, and 200 mg/kg; p.o. and topical) significantly decreased the number of eye wipes. Naloxone, yohimbine, L-NAME, theophylline, glibenclamide, and ruthenium red had no effect on the antinociceptive effect of EOVA. However, ondansetron, p-chlorophenylalanine methyl ester (PCPA), capsazepine, prazosin, and atropine prevented the antinociception induced by EOVA. These results indicate the topical antinociceptive effect of EOVA and showed that 5-HT, α 1, TRPV1, and central muscarinic receptors might be involved in the antinociceptive effect of EOVA in the acute corneal model of pain in mice. |
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