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Provedor de dados:  BJMBR
País:  Brazil
Título:  Estragole blocks neuronal excitability by direct inhibition of Na+ channels
Autores:  Silva-Alves,K.S.
Data:  2013-12-01
Ano:  2013
Palavras-chave:  Estragole
Local anesthetic
Essential oil
Dorsal root ganglia
Na+ current
Resumo:  Estragole is a volatile terpenoid, which occurs naturally as a constituent of the essential oils of many plants. It has several pharmacological and biological activities. The objective of the present study was to investigate the mechanism of action of estragole on neuronal excitability. Intact and dissociated dorsal root ganglion neurons of rats were used to record action potential and Na+ currents with intracellular and patch-clamp techniques, respectively. Estragole blocked the generation of action potentials in cells with or without inflexions on their descendant (repolarization) phase (Ninf and N0 neurons, respectively) in a concentration-dependent manner. The resting potentials and input resistances of Ninf and N0 cells were not altered by estragole (2, 4, and 6 mM). Estragole also inhibited total Na+ current and tetrodotoxin-resistant Na+ current in a concentration-dependent manner (IC50 of 3.2 and 3.6 mM, respectively). Kinetic analysis of Na+ current in the presence of 4 mM estragole showed a statistically significant reduction of fast and slow inactivation time constants, indicating an acceleration of the inactivation process. These data demonstrate that estragole blocks neuronal excitability by direct inhibition of Na+ channel conductance activation. This action of estragole is likely to be relevant to the understanding of the mechanisms of several pharmacological effects of this substance.
Tipo:  Info:eu-repo/semantics/article
Idioma:  Inglês
Editor:  Associação Brasileira de Divulgação Científica
Relação:  10.1590/1414-431X20133191
Formato:  text/html
Fonte:  Brazilian Journal of Medical and Biological Research v.46 n.12 2013
Direitos:  info:eu-repo/semantics/openAccess

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