Abstract
The convulsive agent pentylenetetrazol (PTZ) antagonized γ-aminobutyric acid (GABA)-induced membrane currents on RNA-injected Xenopus oocytes with both extra- and intracellular applications. With extracellular administration PTZ enters the cell within a few minutes and reaches concentrations in the millimolar range. The permeability of the plasma membrane makes it possible for systemically applied PTZ to elicit its effect on the GABA-induced currents via extra- as well as intracellular sites of action.
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