The anticonvulsant effect of cyano-carvone, a monoterpene monocyclic, was investigated in epilepsy model induced by pilocarpine. Cyano-carvone at doses of 25, 50 or 75 mg/kg promoted a reduction of 16.7, 33 and 66.7%, respectively, against pilocarpine-induced seizures, and it was efficacious in increasing both the latency to first seizures and the survival percentage, resulting in 33.3, 67 and 91.7% of protection against death induced by seizures, respectively (P < 0.05). The reference drug atropine (25 mg/kg) also produced a significant protection (100%). Its monoterpene, at 25, 50 and 75 mg/kg, was also capable to increase the latency for installation of status epilepticus induced by pilocarpine, and presented a significant protection against lipid peroxidation and nitrite formation in mice hippocampus (P < 0.05). In addition, it was observed that the cyano-carvone pretreatment increased the acetylcholinesterase activity in mice hippocampus after pilocarpine-induced seizures. The present results clearly indicate the anticonvulsant ability of cyano-carvone, which can be, at least in part, explained by the increased activity of the acetylcholinesterase enzyme. Our data suggest that the action mechanism can also be due to a direct activation of the antioxidant enzymes that could be associated with a reduction observed in oxidative stress in mice hippocampus, probably involving an inhibition of free radical production.
. Doutor e Professor do Programa de Pós-Graduação em Ciências Farmacêuticas da Universidade Federal do Piauí (UFPI), Teresina/PI, Brasil. RESUMOObjetivo: Avaliar a segurança da ciano-carvona por meio de estudos de toxicidade aguda e o seu potencial ansiolítico. Material e Métodos: Camundongos Swiss machos foram tratados com ciano-carvona (v.o) em doses crescentes de 25 a 2000 mg/kg e observados durante 14 dias em relação às alterações comportamentais e taxa de mortalidade. Posteriormente foram realizados exames hematológicos, bioquímicos e análise macroscópica dos principais órgãos. Além disso, outros grupos de animais foram tratados com as doses de 25, 50 e 75 mg/kg, para avaliação da atividade locomotora, do efeito ansiolítico e da coordenação motora. Resultados: No teste hipocrático, devido à ausência de mortalidade, a DL 50 não foi determinada. Os sinais clínicos foram discretos, reversíveis e observados apenas nas maiores doses. Dessa forma, em relação às análises hematológicas e bioquímicas não foram verificadas alterações significativas. Nos estudos comportamentais verificou-se uma redução da atividade locomotora, um maior número de entradas nos braços abertos, bem como um maior tempo de permanência nos braços abertos, sugerindo um possível efeito ansiolítico. Em relação ao teste do rota rod não foi verificada alteração no tempo de permanência na barra giratória, bem como não foi detectado mudanças no número de quedas. Conclusão: Este estudo demonstrou que a cianocarvona não apresenta toxicidade aguda, sugerindo um efeito ansiolítico que precisa ser melhor investigado para a elucidação do seu mecanismo de ação. DESCRITORESAnsiedade. Monoterpeno. Toxicidade Aguda. Sistema Nervoso Central. SUMMARY Objective:To evaluate the safety of cyano-carvone by means of acute toxicity studies and to investigate its anxiolytic potential. Material and Methods: Swiss male mice were treated with cyano-carvone (v.o) in escalating doses from 25 to 2000 mg/kg and observed for 14 days as regards behavioral changes and mortality rate. After this time period, hematological, biochemical and morphological analyses of the main macroscopic organs were carried out. In addition, other groups of animals were treated with doses of 25, 50 and 75 mg/kg in order to assess locomotor activity, anxiolytic effect and motor coordination. Results: In the Hippocratic test, the compound did not cause any deaths among the mice, thus the LD 50 was not determined and clinical signs that emerged were discrete, reversible and observed only in higher doses. Accordingly, hematological and biochemical analyses did not show significant alterations. In the behavioral analysis, it was found a reduction of locomotor activity and a greater number of entries in open arms, as well as a longer time spent with open arms, suggesting an anxiolytic effect. In the Rota-rod test it was observed no change in the permanence time on the spinning rod, as well as no changes were detected for the number of falls. Conclusion: This study demonstrated that cyano-carvone has no...
Compounds classified as antioxidants act by inhibiting or reducing the effects caused by free radicals. Several methods have been developed to obtain an evaluation, it is qualitative or quantitative, the antioxidant capacity of various compounds, both by chemical tests or by using biological tests. In this context, this study aimed to evaluate the stability of the antioxidant potential of the juice and the dry material of cashew ((Anacardium ocidentale Linn) before and after spray-drying technique in yeast Saccharomyces cerevisiae proficient and deficient in antioxidant defenses. The juice of A. occidentale L reduced the growth inhibition in all strains of tested, demonstrating its antioxidant potential. Among all four strains of yeast, the variants SOD2Δ WT and SOD showed higher percentages of reduction in growth inhibition before and after drying. Since the mutants SOD1Δ/SOD2Δ and SOD1Δ the substance tested had low antioxidant activity. The juice of pseudofruit of A. occidentale L showed antioxidant potential by increasing the survival of yeast, verified in the reduction of damage caused by hydrogen peroxide, before and after spray drying, which shows that the technique of spray drying did not alter the antioxidant potential of the material analyzed.
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