Physiological behavioral changes induced by a fraction with antitumor cleronade diterpenes from an Atlantic forest Brazilian plant and computational intermolecular interactions with neuron receptors

Publication date: Available online 7 January 2017
Source:Journal of Ethnopharmacology
Author(s): Éverton José Ferreira de Araújo, Antônia Amanda Cardoso de Almeida, Oskar Almeida Silva, Iwyson Henrique Fernandes da Costa, Luis Mário Rezende Júnior, Francisco das Chagas Alves Lima, Luciano da Silva Lopes, Alberto José Cavalheiro, Paulo Michel Pinheiro Ferreira
Ethnopharmacological relevanceCasearia sylvestris is a medicinal plant traditionally used to treat snakebites, wounds, inflammation and gastric ulcers and scientific supports for have demonstrated its antitumor, antihyperlipidemic and antiparasitic properties.Aim of the studyTo assess the effects of a fraction with casearins (FC) on adult mice using classical experimental models of animal behavior and theoretical calculations to verify the interaction of Casearin X (Cas X) with neuron receptors.Materials and methodsAnimals divided in 6 groups (n=9/group) were intraperitoneally treated with vehicle (DMSO 4%), FC (2.5, 5, 10 and 25mg/kg/day) and diazepam (2mg/kg) for 7 days. Thirty minutes after the last dose of treatment, acute toxicity and behavioral experiments were performed.ResultsThe highest dose of FC (25mg/kg/day) caused diarrhea, weight loss and death of one animal. Elevated plus maze test showed that lower doses [2.5mg/kg/day (36.4 ± 5.1s) and 5mg/kg/day (43.9 ± 6.2s)] increased the time spent in open arms (TSOA). Open field test revealed reduction in the number of crossings (54.9, 51.1, 48 and 67.7% for 2.5, 5, 10 and 25mg/kg/day, respectively) in all doses of FC studied and decrease of rearings at 25mg/kg/day (p < 0.05). Computational calculations showed that the inhibition constant (Ki) for the Cas X-D1 complex is up to 1000-fold more favourable than the Cas X-GABAA complex. All ∆G° values obtained for Cas X-D1 complexes were more negative than those seen with Cas X-GABAA complexes.ConclusionsFindings indicate a probable anxiolytic action of the FC since it reduces the number of crossings and rearings and prolonged the time spent in open arms, without sedative and myorelaxant effects, probably due to the interaction of Cas X with dopaminergic system.

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