Effect of neuroleptics and other drugs on monoamine uptake by membranes of adrenal chromaffin granules

British Journal of Pharmacology
A Pletscher

Abstract

1 The effects have been investigated of various reserpine-like, neuroleptic, antidepressant and other compounds on the adenosine-5'-triphosphate (ATP)-dependent uptake of noradrenaline (NA) (reserpine-sensitive) and tryptamine (reserpine-resistant) by membranes of isolated chromaffin granules of bovine adrenal medulla. 2 Reserpine and Ro 4-1284 (2-hydroxy-2-ethyl-3-isobutyl-9,10-dimethoxy-hexahydro-11bH-benzo(a)quinolizine) as well as neuroleptics (e.g. chlorpromazine and haloperidol) inhibited the NA uptake, but the reserpine-like drugs were more potent. In contrast, Ro 4-1284 showed a considerably weaker effect thatn the neuroleptics in interfering with tryptamine uptake. Chlorpromazine had about the same potency in inhibiting NA and tryptamine uptake, whereas the action of haloperidol was more pronounced on the uptake of NA than of tryptamine. 3 The relative potencies of neuroleptic drugs in inhibiting NA uptake by granule membranes in vitro corresponded only partly to their relative potencies in enhancing dopamine turnover in vivo. 4 The inhibition of NA uptake by chloropromazine and Ro 4-1284 appeared to be of the noncompetitive type. 5 Chlorpromazine did not influence the decrease in ATP induced by granule membranes in th...Continue Reading

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