DEFAR - Departamento de Farmácia

URI permanente desta comunidadehttp://www.hml.repositorio.ufop.br/handle/123456789/530

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2013 - 20202

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Autor: search.filters.author.Estevam, Charles dos Santos

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    Antinociceptive and anti-inflammatory effect of Poincianella pyramidalis (Tul.) L.P. Queiroz.
    (2020) Moraes, Sabrina Zelice da Cruz de; Shan, Andrea Yu Kwan Villar; Melo, Marlange Almeida Oliveira; Silva, Juliane Pereira da; Passos, Fabiolla Rocha Santos; Graça, Ariel de Souza; Araújo, Brancilene Santos de; Quintans, Jullyana de Souza Siqueira; Quintans Júnior, Lucindo José; Barreto, Emiliano de Oliveira; Brandão, Geraldo Célio; Estevam, Charles dos Santos
    Ethnopharmacology relevance: Poncianella pyramidalis (Leguminosae) is a Caatinga plant used in folk medicine because of its pharmacological properties, which include anti-inflammatory action. However, chemical compounds re sponsible for this effect have not yet been identified. Aim of the study: This study aimed to evaluate the antioxidant, antinociceptive and anti-inflammatory effects of the ethyl acetate fraction from the inner bark of P. pyramidalis. Material and methods: Total phenol content (TP) was estimated using the Folin-Ciocalteu reagent, while in vitro antioxidant activity was determined by the 2,2-diphenyl-1-picrylhydrazyl (DPPH) free radical scavenging assay. Chemical identification was done using LC-PDA/MS and LC-ESI/MS/MS. In vivo antinociceptive and anti-in flammatory properties were investigated using formalin, mechanical hypernociception and carrageenan-induced pleurisy assays in mice. Results: TP was 525.08 ± 17.49 μg mg−1 gallic acid equivalent. The ethyl acetate fraction (EAF) inhibited 87.76% of the DPPH radical with an EC50 of 22.94 μg mL−1 and Antioxidant Activity Index of 1.74. LC-PDA/MS and LC-ESI/MS/MS identified 15 compounds that are mostly derived from gallic and ellagic acids. Regarding in vivo antinociceptive and anti-inflammatory activity, EAF (100 mg kg-1) significantly reduced the nociceptive response in the second phase of the formalin assay by 50% (p < 0.01) compared with the control group. In the hypernociception test, a significant (p < 0.001) anti-hyperalgesic effect of EAF (100 mg kg-1) was observed up to the third hour of evaluation (p < 0.001). In the carrageenan assay, EAF (100 mg kg-1) was shown to inhibit protein extravasation, increase total leukocytes and neutrophils, and inhibit mononuclear cells. Conclusion: These results demonstrate EAF from the inner bark of P. pyramidalis has strong in vitro antioxidant effect as well as in vivo antinociceptive and anti-inflammatory activities, which may be attributed to the bark being rich in phenolic compounds derived from gallic acid.
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    The positive inotropic effect of the ethyl acetate fraction from Erythrina velutina leaves on the mammalian myocardium : the role of adrenergic receptors.
    (2013) Passos, Amilton Gustavo da Silva; Gondim, Antônio Nei Santana; Campos, Danilo Roman; Cruz, Jader dos Santos; Garcia, Eduardo Antônio Conde; Araújo Neto, Vitor; Estevam, Charles dos Santos; Cerqueira, Sandra Valéria Santos; Brandão, Geraldo Célio; Oliveira, Alaíde Braga de; Vasconcelos, Carla Maria Lins de
    Objectives We studied the effects of ethyl acetate fraction (EAcF) obtained from Erythrina velutina leaves on mammalian myocardium. Methods The effect of EAcF on the contractility was studied using guinea-pig left atria mounted in a tissue bath (Tyrode’s solution, 29°C, 95% CO2, 5% O2) and electrically stimulated (1 Hz). Concentration-response curves of EAcF were obtained in the presence of propranolol (1 mm), nifedipine (1 mm) and in reserpinized animals (5 mg/kg). The involvement of l-type calcium current (ICa,L) on the EAcF effect was observed in cardiomyocytes of mice assessed using patch-clamp technique. Key findings EAcF (550 mg/ml) had a positive inotropic effect, increasing the atrial force by 164% (EC50 = 157 44 mg/ml, n = 6), but it was less potent than isoproterenol (EC50 = 0.0036 0.0019 mg/ml, n = 8). The response evoked by EAcF was abolished by propranolol or nifedipine. Reserpine did not alter the inotropic response of EAcF. Furthermore, an enhancement of the ICa,L peak (31.2%) with EAcF was observed. Chemical analysis of EAcF revealed the presence of at least 10 different flavonoid glycoside derivatives. Two were identified as vicenin II and isorhoifolin. Conclusions We conclude that EAcF increases the cardiac contractile force by increasing the l-type calcium current and activating the adrenergic receptor pathway.