Abstract
The effects of the psychotomimetic drug, phencyclidine, on the reserpine sensitive uptake of (-)noradrenaline, on the reserpine resistant uptake of tryptamine, and on catecholamine release were studied in vitro using bovine chromaffin granules. Phencyclidine inhibited the uptake of (-)noradrenaline and tryptamine in a concentration-dependent manner. It caused 50% inhibition of (-)noradrenaline uptake at 2 X 10(-4)M and of tryptamine uptake at 7 X 10(-4)M. Release of catecholamines was not affected by phencyclidine at 0 degree C and pH 6--8 in concentrations up to 8 X 10(-3)M, whereas at 37 degrees C the drug (4 X 10(-3)M) caused a release that was increased when the pH was raised from 6 to 8. Since the effects of phencyclidine on chromaffin granule uptake and release are observed at high concentrations of the drug only, there is no evidence that these effects are relevant to the in vivo effects of the drug.
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