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Outward potassium current oscillations in macrophage polykaryons: extracellular calcium entry and calcium-induced calcium release BJMBR
Saraiva,R.M.; Masuda,M.O.; Oliveira-Castro,G.M..
Outward current oscillations associated with transient membrane hyperpolarizations were induced in murine macrophage polykaryons by membrane depolarization in the absence of external Na+. Oscillations corresponded to a cyclic activation of Ca2+-dependent K+ currents (IKCa) probably correlated with variations in intracellular Ca2+ concentration. Addition of external Na+ (8 mM) immediately abolished the outward current oscillations, suggesting that the absence of the cation is necessary not only for their induction but also for their maintenance. Oscillations were completely blocked by nisoldipine. Ruthenium red and ryanodine reduced the number of outward current cycles in each episode, whereas quercetin prolonged the hyperpolarization 2- to 15-fold. Neither...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Macrophage; Macrophage polykaryon; Ca2+-dependent K+ current; Membrane potential oscillations; Calcium-induced calcium release; Ca2+ ATPase.
Ano: 1997 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1997001100015
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