http://www.cnr.it/ontology/cnr/individuo/prodotto/ID9488
Effects of Intracellular Magnesium on Kv1.5 and Kv2.1 Potassium Channels. (Articolo in rivista)
- Type
- Label
- Effects of Intracellular Magnesium on Kv1.5 and Kv2.1 Potassium Channels. (Articolo in rivista) (literal)
- Anno
- 2005-01-01T00:00:00+01:00 (literal)
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- Tammaro P., Smirnov S., Moran O. (literal)
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- Pagina fine
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- Rivista
- Note
- ISI Web of Science (WOS) (literal)
- Titolo
- Effects of Intracellular Magnesium on Kv1.5 and Kv2.1 Potassium Channels. (literal)
- Abstract
- We characterized the effects of intracellular Mg(2+) (Mg(2+) (i)) on potassium currents mediated by the Kv1.5 and Kv2.1 channels expressed in Xenopus oocytes. Increase in Mg(2+) (i) caused a voltage-dependent block of the current amplitude, apparent acceleration of the current kinetics (explained by a corresponding shift in the steady-state activation) and leftward shifts in activation and inactivation dependencies for both channels. The voltage-dependent block was more potent for Kv2.1 [dissociation constant at 0 mV, K(d)(0), was approximately 70 mM and the electric distance of the Mg(2+) binding site, delta, was 0.2] than for the Kv1.5 channel [K(d)(0) approximately 40 mM and delta = 0.1]. Similar shifts in the voltage-dependent parameters for both channels were described by the Gouy-Chapman formalism with the negative charge density of 1 e(-)/100 A(2). Additionally, Mg(2+) (i) selectively reduced a non-inactivating current and increased the accumulation of inactivation of the Kv1.5, but not the Kv2.1 channel. A potential functional role of the differential effects of Mg(2+) (i) on the Kv channels is discussed. (literal)
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