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  • Title: The action of verapamil on the rate of spontaneous release of transmitter at the frog neuromuscular junction.
    Author: Publicover SJ, Duncan CJ.
    Journal: Eur J Pharmacol; 1979 Feb 15; 54(1-2):119-27. PubMed ID: 33814.
    Abstract:
    Verapamil is known to reduce Ca2+ entry in a variety of cells. At 10(-5) M it produces a small reduction in MEPP frequency at the frog neuromuscular junction, whereas the rate of spontaneous release rises following treatment at a concentration of 10(-4) M. This latter effect is augmented by raising [Ca2+]0 to 9 mM or, more especially, by raising the temperature from 17 to 23 degrees C. It is argued that both these opposing effects are related to the action of verapamil in modifying [Ca2+]i at the presynaptic terminals and it is suggested that the drug can affect both inward Ca2+ flux (so reducing the steady-state position of [Ca2+]i) and also, at higher concentration, either inhibit the membrane Ca2+ pump or cause the release of Ca2+ from intracellular Ca2+ stores (so raising [Ca2+]i).
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