Monovalent currents through the T-type Cav3.1 channels and their block by Mg2+
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- PMID: 18063852
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Monovalent currents through the T-type Cav3.1 channels and their block by Mg2+
Gen Physiol Biophys.
2007 Sep.
Abstract
We have investigated the permeability of the Cav3.1 channel for Ca2+ and different monovalent cations and the block of the currents by Mg2+ ions. In the absence of extracellular divalent cations, the Cav3.1 channel was more permeable for Na+ than for Cs+ and impermeable for NMDG+. Monovalent currents were inhibited by Mg2+ of near physiological concentration by three orders of magnitude more effectively than the Ca2+ current. Inhibition of outward, but not inward current by Mg2+ was voltage-dependent. Furthermore, magnesium slowed down channel deactivation presumably by interacting with an open channel state.
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