Inhibition of salicylate on potassium channels in rat inferior colliculus neurons / 中华耳鼻咽喉头颈外科杂志
Chinese Journal of Otorhinolaryngology Head and Neck Surgery
;
(12): 835-839, 2005.
Artigo
em Chinês
| WPRIM
| ID: wpr-239123
ABSTRACT
<p><b>OBJECTIVE</b>To understand what role of the transient outward potassium channels and the delayed rectifier potassium channels play in the mechanism of salicylate-induced tinnitus.</p><p><b>METHODS</b>The effects of salicylate on the transient outward potassium channels and the delayed rectifier potassium channels in freshly dissociated inferior colliculus neurons of rats were studied, using the whole-cell voltage clamp method.</p><p><b>RESULTS</b>Salicylate blocked the transient outward potassium current (I(K(A and the delayed rectifier potassium current (I(K(DR in concentration-dependent manner (0.1-1 mmol/L). The IC50 values for the blocking action of salicylate on I(K(A)) and I(K(DR)) were 2.27 and 0.80 mmol/L, respectively. At a concentration of 1 mmol/L, salicylate did not shift the activation and inactivation curves of I(K(A)), but significantly shifted the activation and inactivation curves of I(K(DR)) negatively by approximately 11 mV and 24 mV.</p><p><b>CONCLUSIONS</b>Salicylate inhibits both I(K(A)) and I(K(DR)) in rat inferior colliculus neurons but only significantly affects the activation and inactivation kinetics of I(K(DR)). Effects of I(K(A)) and I(K(DR)), especially I(K(DR)), by salicylate may play an important role in salicylate-induced tinnitus.</p>
Texto completo:
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Índice:
WPRIM (Pacífico Ocidental)
Assunto principal:
Farmacologia
/
Fisiologia
/
Colículos Inferiores
/
Canais de Potássio
/
Salicilatos
/
Ratos Wistar
/
Técnicas de Patch-Clamp
/
Biologia Celular
/
Canais de Potássio de Retificação Tardia
/
Neurônios
Limite:
Animais
Idioma:
Chinês
Revista:
Chinese Journal of Otorhinolaryngology Head and Neck Surgery
Ano de publicação:
2005
Tipo de documento:
Artigo
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