Muscimol-stimulated Cl(-)conductance in brain cortex synaptoneurosomes from Wistar rats decreased 15 min after single intraperitoneal injection of pentylenetetrazole in a subconvulsive dose. These changes reflected a decrease in functional activity of the GABA(A)-receptor/Cl(-)ionophore complex. Muscimol-stimulated Cl(-)conductance in synaptoneurosomes returned to normal 48 h after pentylenetetrazole administration.
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