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Vicente-Silva W, Silva-Freitas FR, Beserra-Filho JIA, Cardoso GN, Silva-Martins S, Sarno TA, Silva SP, Soares-Silva B, Dos Santos JR, da Silva RH, Prado CM, Ueno AK, Lago JHG, Ribeiro AM. Sakuranetin exerts anticonvulsant effect in bicuculline-induced seizures. Fundam Clin Pharmacol 2022; 36:663-673. [PMID: 35156229 DOI: 10.1111/fcp.12768] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2021] [Revised: 02/10/2022] [Accepted: 02/11/2022] [Indexed: 01/07/2023]
Abstract
Epilepsy is a chronic neurological disorder characterized by an abnormal, spontaneous, and synchronized neuronal hyperactivity. Therapeutic approaches for controlling epileptic seizures are associated with pharmacoresistance and side effects burden. Previous studies reported that different natural products may have neuroprotector effects. Sakuranetin (SAK) is a flavanone with antiparasitic, anti-inflammatory, antimutagenic, antiallergic, and antioxidant activity. In the present work, the effect of SAK on seizures in a model of status epilepticus induced by bicuculline (BIC) in mice was evaluated. Male Swiss mice received an intracerebroventricular injection (i.c.v.) of SAK (1, 10, or 20 mg/kg-SAK1, SAK10, or SAK20). Firstly, animals were evaluated in the open field (OF; 20 min), afterwards in the elevated plus maze (EPM) test (5 min). Next, 30 min prior the administration of BIC (1 mg/kg), mice received an injection of SAK (1 or 10 mg/kg, i.c.v.) and were observed in the OF (20 min) for seizures assessment. After behavioral procedures, immunohistochemical analysis of c-Fos was performed. Our main results showed that the lowest doses of SAK (1 and 10 mg/kg) increased the total distance traveled in the OF, moreover protected against seizures and death on the BIC-induced seizures model. Furthermore, SAK treatment reduced neuronal activity on the dentate gyrus of the BIC-treated animals. Taken together, our results suggest an anticonvulsant effect of SAK, which could be used for the development of anticonvulsants based on natural products from herbal source.
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Affiliation(s)
- Wilson Vicente-Silva
- Department of Biosciences, Federal University of São Paulo, Santos, São Paulo, Brazil
| | | | | | | | - Suellen Silva-Martins
- Department of Biosciences, Federal University of São Paulo, Santos, São Paulo, Brazil
| | - Tamires Alves Sarno
- Department of Biosciences, Federal University of São Paulo, Santos, São Paulo, Brazil
| | - Sara Pereira Silva
- Department of Biosciences, Federal University of São Paulo, Santos, São Paulo, Brazil
| | - Beatriz Soares-Silva
- Department of Biosciences, Federal University of São Paulo, Santos, São Paulo, Brazil
| | | | - Regina Helena da Silva
- Department of Pharmacology, Federal University of São Paulo, São Paulo, São Paulo, Brazil
| | - Carla Máximo Prado
- Department of Biosciences, Federal University of São Paulo, Santos, São Paulo, Brazil
| | - Anderson Keity Ueno
- Department of Biosciences, Federal University of São Paulo, Diadema, São Paulo, Brazil
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Nôga DAMF, Brandão LEM, Cagni FC, Silva D, de Azevedo DLO, Araújo A, Dos Santos WF, Miranda A, da Silva RH, Ribeiro AM. Anticonvulsant Effects of Fractions Isolated from Dinoponera quadriceps (Kempt) Ant Venom (Formicidae: Ponerinae). Toxins (Basel) 2016; 9:toxins9010005. [PMID: 28025529 PMCID: PMC5308238 DOI: 10.3390/toxins9010005] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2016] [Revised: 10/24/2016] [Accepted: 11/01/2016] [Indexed: 12/13/2022] Open
Abstract
Natural products, sources of new pharmacological substances, have large chemical diversity and architectural complexity. In this context, some toxins obtained from invertebrate venoms have anticonvulsant effects. Epilepsy is a neurological disorder that affects about 65 million people worldwide, and approximately 30% of cases are resistant to pharmacological treatment. Previous studies from our group show that the denatured venom of the ant Dinoponera quadriceps (Kempt) protects mice against bicuculline (BIC)-induced seizures and death. The aim of this study was to investigate the anticonvulsant activity of compounds isolated from D. quadriceps venom against seizures induced by BIC in mice. Crude venom was fractionated by high-performance liquid chromatography (HPLC) resulting in six fractions referred to as DqTx1-DqTx6. A liquid chromatography-mass spectrometry (LC/MS) analysis revealed a major 431 Da compound in fractions DqTx1 and DqTx2. Fractions DqTx3 and DqTx4 showed a compound of 2451 Da and DqTx5 revealed a 2436 Da compound. Furthermore, the DqTx6 fraction exhibited a major component with a molecular weight of 13,196 Da. Each fraction (1 mg/mL) was microinjected into the lateral ventricle of mice, and the animals were observed in an open field. We did not observe behavioral alterations when the fractions were given alone. Conversely, when the fractions were microinjected 20 min prior to the administration of BIC (21.6 nM), DqTx1, DqTx4, and DqTx6 fractions increased the latency for onset of tonic-clonic seizures. Moreover, all fractions, except DqTx5, increased latency to death. The more relevant result was obtained with the DqTx6 fraction, which protected 62.5% of the animals against tonic-clonic seizures. Furthermore, this fraction protected 100% of the animals from seizure episodes followed by death. Taken together, these findings indicate that compounds from ant venom might be a potential source of new anticonvulsants molecules.
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Affiliation(s)
| | | | - Fernanda Carvalho Cagni
- Physiology Department, University Federal of Rio Grande of Norte, Natal, RN 59078-970, Brazil.
| | - Delano Silva
- Physiology Department, University Federal of Rio Grande of Norte, Natal, RN 59078-970, Brazil.
| | | | - Arrilton Araújo
- Physiology Department, University Federal of Rio Grande of Norte, Natal, RN 59078-970, Brazil.
| | | | - Antonio Miranda
- Biophysics Department, Federal University of São Paulo, São Paulo, SP 04023-062, Brazil.
| | - Regina Helena da Silva
- Pharmacology Department, Federal University of São Paulo, São Paulo, SP 04023-062, Brazil.
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Jorge MP, Pontes IMDO, Nascimento EBD, Shiramizu VKM, Silva RHD, Ribeiro AM. Influência da prática do yoga sobre os sintomas do climatério. Rev Bras Med Fam Comunidade 2012. [DOI: 10.5712/rbmfc7(1)602] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
Introdução: Yoga vem sendo praticado há mais de três mil anos e atualmente seu conjunto de técnicas de controle do corpo e da mente tem sido adotado por milhares de pessoas em todo o mundo. Um número crescente de estudos têm atribuído ao yoga benefícios significativos para a reabilitação da saúde do indivíduo. Na mulher, o processo de envelhecimento é marcado pela suspensão da atividade folicular ovariana (menopausa) durante o período do climatério, este caracterizado por uma série de alterações fisiológicas e neuroendócrinas que podem ser acompanhadas por sintomas desconfortáveis e muitas vezes debilitantes. Objetivo: o objetivo deste estudo é investigar os efeitos psicofisiológicos da prática regular do yoga em mulheres que apresentam sintomas do climatério. Método: Noventa mulheres na faixa etária entre 45 e 65 anos, já em menopausa há pelo menos um ano foram divididas em três grupos: Grupo Controle (não participaram das atividades, n = 19), Grupo ginástica suave (2 vezes por semana, n = 31) e Grupo yoga (2 vezes por semana, n = 40). Todas as participantes foram avaliadas antes e ao final do período da intervenção (12 semanas) através dos inventários de síndrome climatérica (MRS: Menopause Rating Scale), depressão (Inventário de Depressão de Beck), estresse (Inventário de Sintomas de Stress para Adultos de Lipp) e medidas de cortisol salivar. O protocolo de pesquisa foi aprovado pelo comitê de ética (582/11/CEP/HUOL, CAAE 09930.000.294-11). Resultados: Nossos resultados mostraram que as voluntárias que praticaram yoga apresentaram redução do índice referente aos sintomas climatéricos após 12 semanas de prática (8,65 ± 1,05) em relação as voluntárias que praticaram ginástica suave (15,13 ± 1,24) e ao grupo controle que não praticou nenhuma atividade (18,58 ± 2,59), esta redução indica uma melhora nos sintomas. Além disso, os grupos ginástica suave (11,65 ± 0,95) e yoga (9,85 ± 1,17) apresentaram uma melhora significativa com relação aos níveis de depressão quando comparados ao grupo controle (18,95 ± 2,66). Após 12 semanas de pratica, os níveis de estresse também foram reduzidos no grupo yoga (0,55 ± 0,14) com relação ao controle (1,74 ± 0,31) e grupo ginástica suave (1,35 ± 0,19). Conclusões: Nossos resultados mostram que a prática deyogapode ser eficazna redução dos sintomas do climatério, além de diminuir os níveis de estresse dessas mulheres, podendo ser considerado como terapia alternativa para o manejo dos sintomas da menopausa.
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