Up-regulation of the transient A-type K+ current (IA) in the differentiation of neural stem cells of the early postnatal rat hippocampus / 中华医学杂志(英文版)
Chinese Medical Journal
;
(24): 1731-1735, 2010.
Artigo
em Inglês
| WPRIM
| ID: wpr-241729
ABSTRACT
<p><b>BACKGROUND</b>Neural stem cells (NSCs) not only are essential to cell replacement therapy and transplantation in clinical settings, but also provide a unique model for the research into neurogenesis and epigenesis. However, little attention has been paid to the electrophysiological characterization of NSC development. This work aimed to identify whether the morphological neuronal differentiation process in NSCs included changes in the electrophysiological properties of transient A-type K(+) currents (I(A)).</p><p><b>METHODS</b>NSCs were isolated from early postnatal rat hippocampus and were multiplied in basic serum-free medium containing basic fibroblast growth factor. Potassium currents were investigated and compared using whole-cell patch-clamp techniques and one-way analysis of variance (ANOVA), respectively.</p><p><b>RESULTS</b>Compared with NSC-derived neurons, cloned NSCs (cNSCs) had a more positive resting membrane potential, a higher input resistance, and a lower membrane capacitance. Part of cNSCs and NSC-derived neurons possessed both delayed-rectifier K(+) currents (I(DR)) and I(A), steady-state activation of I(A) in cNSCs (half-maximal activation at (21.34 +/- 4.37) mV) occurred at a more positive voltage than in NSC-derived neurons at 1-6 days in vitro (half-maximal activation at (12.85 +/- 4.19) mV).</p><p><b>CONCLUSIONS</b>Our research revealed a developmental up-regulation of the I(A) component during differentiation of postnatal NSCs. Together with the marked developmental up-regulation of I(DR) in vitro neuronal differentiation we have previously found, the voltage-gated potassium channels may participate in neuronal maturation process.</p>
Texto completo:
DisponíveL
Índice:
WPRIM (Pacífico Ocidental)
Assunto principal:
Fisiologia
/
Potássio
/
Ratos Sprague-Dawley
/
Técnicas de Patch-Clamp
/
Biologia Celular
/
Canais de Potássio de Abertura Dependente da Tensão da Membrana
/
Eletrofisiologia
/
Células-Tronco Neurais
/
Hipocampo
/
Potenciais da Membrana
Tipo de estudo:
Estudo prognóstico
Limite:
Animais
Idioma:
Inglês
Revista:
Chinese Medical Journal
Ano de publicação:
2010
Tipo de documento:
Artigo
Similares
MEDLINE
...
LILACS
LIS