Mepiprazole, a new psychotropic drug: effects on uptake and retention of monoamines in rat brain synaptosomes.

Abstract:

:The influence of mepiprazole (EMD 16,923), a new pyrazol-ylalkyl-piperazine derivative, on the uptake of 3H-norepinephrine (NE), 3H-dopamine (DA), and 3H-serotonin (5-HT) into rat brain synaptosomes from cerebral cortex, corpus striatum, and hypothalamus was investigated in comparison with several psychotropic drugs, including oxypertine, d-amphetamine, imipramine, desipramine, chlorimipramine, amitriptyline, and chlorpromazine in vitro. Mepiprazole was a relatively weak inhibitor of monoamine uptake and exhibited its strongest action on the hypothalamic 5-HT uptake, being almost equipotent with desipramine (IC50 = 0.9 MUM). Furthermore, the influence of the drugs on the retention of 3H-amines previously taken up by whole rat brain synaptosomes was studied. Unlike the tricyclic antidepressants, mepiprazole as well as oxypertine and d-amphetamine markedly increased the efflux of radioactivity during a 20-min incubation at 37 degrees C at low concentrations (10(-6) to 10(-5) M), whereas at 10(-4) M all drugs greatly enhanced the efflux. The ability of mepiprazole to increase 5-HT concentration at the receptor level by a combination of neuronal uptake inhibition and release is discussed in relationship to the central actions of the drug.

journal_title

Psychopharmacology

authors

Placheta P,Singer E,Kriwanek W,Hertting G

doi

10.1007/BF00496865

subject

Has Abstract

pub_date

1976-08-17 00:00:00

pages

295-301

issue

3

eissn

0033-3158

issn

1432-2072

journal_volume

48

pub_type

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