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Single-Channel Recording of TASK-3-like K+ Channel and Up- Regulation of TASK-3 mRNA Expression after Spinal Cord Injury in Rat Dorsal Root Ganglion Neurons
The Korean Journal of Physiology and Pharmacology ; : 245-251, 2008.
Artículo en Inglés | WPRIM | ID: wpr-728380
ABSTRACT
Single-channel recordings of TASK-1 and TASK-3, members of two-pore domain K+ channel family, have not yet been reported in dorsal root ganglion (DRG) neurons, even though their mRNA and activity in whole-cell currents have been detected in these neurons. Here, we report single-channel kinetics of the TASK-3-like K+ channel in DRG neurons and up-regulation of TASK-3 mRNA expression in tissues isolated from animals with spinal cord injury (SCI). In DRG neurons, the single-channel conductance of TASK-3-like K+ channel was 33.0+/-0.1 pS at -60 mV, and TASK-3 activity fell by 65+/-5% when the extracellular pH was changed from 7.3 to 6.3, indicating that the DRG K+ channel is similar to cloned TASK-3 channel. TASK-3 mRNA and protein levels in brain, spinal cord, and DRG were significantly higher in injured animals than in sham-operated ones. These results indicate that TASK-3 channels are expressed and functional in DRG neurons and the expression level is up-regulated following SCI, and suggest that TASK-3 channel could act as a potential background K+ channel under SCI-induced acidic condition.
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Texto completo: Disponible Índice: WPRIM (Pacífico Occidental) Asunto principal: Médula Espinal / Traumatismos de la Médula Espinal / Raíces Nerviosas Espinales / Acidosis / Encéfalo / ARN Mensajero / Cinética / Regulación hacia Arriba / Células Clonales / Grupos Diagnósticos Relacionados Límite: Animales / Humanos Idioma: Inglés Revista: The Korean Journal of Physiology and Pharmacology Año: 2008 Tipo del documento: Artículo

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Texto completo: Disponible Índice: WPRIM (Pacífico Occidental) Asunto principal: Médula Espinal / Traumatismos de la Médula Espinal / Raíces Nerviosas Espinales / Acidosis / Encéfalo / ARN Mensajero / Cinética / Regulación hacia Arriba / Células Clonales / Grupos Diagnósticos Relacionados Límite: Animales / Humanos Idioma: Inglés Revista: The Korean Journal of Physiology and Pharmacology Año: 2008 Tipo del documento: Artículo