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Neuroleptic-induced dopamine hyposensitivity.

C G Goetz, P M Carvey, C M Tanner

    Life Sciences
    |April 9, 1984
    PubMed
    Summary
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    Most neuroleptic drugs cause dopaminergic hypersensitivity, but thioridazine causes hyposensitivity. This difference in dopaminergic sensitization may help prevent tardive dyskinesia, a disorder from long-term neuroleptic use.

    Area of Science:

    • Neuropharmacology
    • Neuroscience

    Background:

    • Neuroleptic drugs, used to treat psychosis, can cause significant side effects.
    • Chronic exposure to neuroleptics is associated with tardive dyskinesia, a movement disorder.
    • Most neuroleptics induce dopaminergic hypersensitivity, a potential mechanism for side effects.

    Purpose of the Study:

    • To investigate the differential effects of thioridazine and fluphenazine on dopaminergic sensitivity in rats.
    • To explore the neurobiological mechanisms underlying these differential effects.
    • To assess the implications for managing and preventing tardive dyskinesia.

    Main Methods:

    • Rats were administered either thioridazine or fluphenazine.
    • Subsequent apomorphine stereotypy was measured to assess dopaminergic sensitivity.

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  • Anticholinergic properties and other mechanisms were considered.

    • Main Results:

    • Fluphenazine induced the expected dopaminergic hypersensitivity.
    • Thioridazine, in contrast, induced hyposensitivity to apomorphine stereotypy.
    • The anticholinergic effects of thioridazine may contribute, but other mechanisms are also involved.

    Conclusions:

    • Thioridazine exhibits unique neuroleptic properties compared to fluphenazine, specifically regarding dopaminergic sensitization.
    • Understanding these differences is crucial for developing strategies to prevent neuroleptic-induced side effects like tardive dyskinesia.
    • Further research into the mechanisms of thioridazine's effects could inform safer therapeutic approaches.