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Differential expression of two-pore domain potassium channels in rat cerebellar granule neurons.
Burgos, Paulina; Zúñiga, Rafael; Domínguez, Pedro; Delgado-López, Fernando; Plant, Leigh D; Zúñiga, Leandro.
Afiliação
  • Burgos P; Centro de Investigaciones Médicas CIM, Escuela de Medicina, Universidad de Talca, Talca, Chile.
  • Zúñiga R; Centro de Investigaciones Médicas CIM, Escuela de Medicina, Universidad de Talca, Talca, Chile.
  • Domínguez P; Centro de Investigaciones Médicas CIM, Escuela de Medicina, Universidad de Talca, Talca, Chile.
  • Delgado-López F; Facultad de Medicina, Universidad Católica del Maule, Talca, Chile.
  • Plant LD; Department of Biochemistry, Brandeis University, Waltham, USA.
  • Zúñiga L; Centro de Investigaciones Médicas CIM, Escuela de Medicina, Universidad de Talca, Talca, Chile. Electronic address: lzuniga@utalca.cl.
Biochem Biophys Res Commun ; 453(4): 754-60, 2014 Oct 31.
Article em En | MEDLINE | ID: mdl-25305496
Two pore domain potassium (K2P) channels are mostly present in the central nervous system (CNS) where they play important roles in modulating neuronal excitability. K2P channels give rise to background K(+) currents (IKSO) a key component in setting and maintaining the resting membrane potential in excitable cells. Here, we studied the expression and relative abundances of K2P channels in cerebellar granule neurons (CGNs), combining molecular biology, electrophysiology and immunologic techniques. The CGN IKSO was very sensitive to external pH, as previously reported. Quantitative determination of mRNA expression level demonstrated the existence of an accumulation pattern of transcripts in CGN that encode K2P9>K2P1>K2P3>K2P18>K2P2=K2P10>K2P4>K2P5 subunits. The presence of the major K2P subunits expressed was then confirmed by Western blot and immunofluorescence analysis, demonstrating robust expression of K2P1 (TWIK-1), K2P3 (TASK-1), K2P9 (TASK-3) and K2P18 (TRESK) channel protein. Based, on these results, it is concluded that K2P1, -3, -9 and -18 subunits represent the majority component of IKSO current in CGN.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Canais de Potássio / Cerebelo / Canais de Potássio de Domínios Poros em Tandem / Neurônios Limite: Animals Idioma: En Revista: Biochem Biophys Res Commun Ano de publicação: 2014 Tipo de documento: Article País de afiliação: Chile País de publicação: Estados Unidos

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Canais de Potássio / Cerebelo / Canais de Potássio de Domínios Poros em Tandem / Neurônios Limite: Animals Idioma: En Revista: Biochem Biophys Res Commun Ano de publicação: 2014 Tipo de documento: Article País de afiliação: Chile País de publicação: Estados Unidos