The kinetics of a non-inactivating K(+) current in alphaT3-1 pituitary gonadotropes is not affected by holding potential.
Brain Res
; 873(2): 218-24, 2000 Aug 11.
Article
en En
| MEDLINE
| ID: mdl-10930547
ABSTRACT
The non-inactivating K(+) currents in alphaT3-1, a gonadotroph cell line, were recorded in the presence of low intracellular free calcium concentration. The activation kinetics of the whole-cell currents and the gating charge measured from holding potential (V(HOLD)) of -10 mV, V(HOLD)=-80 mV in presence of 4-AP (4-aminopyridine), and V(HOLD)=-10 mV with a hyperpolarizing prepulse to -80 mV were similar. No difference was observed in the onset of currents elicited from the hyperpolarizing potentials, suggesting deviation from the Cole-Moore prediction of increase in the delay of current onset with increasing hyperpolarization. The data suggests that the channel opens with at least one rate-limiting voltage-dependent step, which may imply that the position of the voltage sensor is unaffected by hyperpolarization.
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Base de datos:
MEDLINE
Asunto principal:
Hipófisis
/
Canales de Potasio
/
Gonadotropinas Hipofisarias
/
Potenciales de la Membrana
Tipo de estudio:
Prognostic_studies
Idioma:
En
Revista:
Brain Res
Año:
2000
Tipo del documento:
Article
País de afiliación:
India