Voltage-dependent calcium channels from brain incorporated into planar lipid bilayers

M. T. Nelson, R. J. French, B. K. Krueger

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Many important physiological processes, including neurotransmitter release and muscle contraction, are regulated by the concentration of Ca2+ ions in the cell. Levels of cytoplasmic Ca2+ can be elevated by the entry of Ca2+ ions through voltage-dependent channels which are selective for Ca2+, Ba2+ and Sr2+ ions. We have measured currents through single, voltage-dependent calcium channels from rat brain that have been incorporated into planar lipid bilayers. Channel gating was voltage-dependent: membrane depolarization increased the channel open times and decreased the closed times. The channels were selective for divalent cations over monovalent ions. The well-known calcium channel blockers, lanthanum and cadmium, produced a concentration-dependent reduction of the apparent single-channel conductance. Contrary to expectations, the nature of the divalent cation carrying current through the channel affected not only the single-channel conductance, but also the channel open times, with mean open times being shortest for barium.
    Original languageEnglish
    Pages (from-to)77-80
    Number of pages3
    JournalNature
    Volume308
    Issue number5954
    Publication statusPublished - 1984

    Keywords

    • Animals
    • pharmacology: Barium
    • physiology: Brain
    • metabolism: Calcium
    • Cattle
    • Electric Conductivity
    • drug effects: Ion Channels
    • Lipid Bilayers
    • physiology: Median Eminence
    • drug effects: Membrane Potentials
    • Rats
    • pharmacology: Strontium

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