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Clozapine--a serotonin antagonist?

H Fink, R Morgenstern, W Oelssner

    Pharmacology, Biochemistry, and Behavior
    |April 1, 1984
    PubMed
    Summary
    This summary is machine-generated.

    Clozapine acts as a serotonin antagonist, affecting central serotonergic transmission. This study investigated clozapine

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    Area of Science:

    • Neuropharmacology
    • Psychopharmacology

    Background:

    • Serotonergic system plays a crucial role in regulating motor activity.
    • Lysergic acid diethylamide (LSD) potentiates apomorphine-induced hypermotility via serotonin agonism in the median raphe nucleus.

    Purpose of the Study:

    • To investigate the effect of clozapine on central serotonergic transmission.
    • To elucidate the specific action of clozapine within the nucleus accumbens and median raphe nucleus.

    Main Methods:

    • Microinjection of clozapine into the nucleus accumbens and median raphe nucleus of rats.
    • Assessment of open-field motility following drug administration.
    • Comparison with effects of serotonin antagonists and dopamine antagonists like haloperidol.

    Main Results:

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    • Clozapine in the median raphe nucleus (0.05 µg) suppressed the LSD-induced potentiation of apomorphine hypermotility, similar to serotonin antagonists.
    • Clozapine in the nucleus accumbens (0.2 µg) increased apomorphine-induced hypermotility, unlike the dopamine antagonist haloperidol which suppressed it.
    • Alpha-adrenergic action of clozapine was excluded based on locomotor effects of alpha-adrenergic drugs in the median raphe nucleus.

    Conclusions:

    • Clozapine exhibits a serotonin antagonist action.
    • The findings suggest clozapine's complex interaction with neurotransmitter systems involved in motor control.