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Related Experiment Videos

Subchronic methamphetamine treatment selectively attenuates apomorphine-induced decrease in 3,4-dihydroxyphenylacetic

H Watanabe

    Life Sciences
    |December 16, 1985
    PubMed
    Summary

    Repeated methamphetamine use may lead to reduced sensitivity in dopamine receptors within the brain's reward pathways. This suggests a potential mechanism for the drug's behavioral effects and addiction potential.

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    Area of Science:

    • Neuroscience
    • Pharmacology
    • Behavioral Science

    Background:

    • Subchronic amphetamine administration can lead to behavioral enhancement.
    • Understanding the neurobiological mechanisms underlying these effects is crucial.

    Purpose of the Study:

    • To investigate the effects of apomorphine on dopamine and DOPAC levels after repeated methamphetamine exposure.
    • To explore potential changes in presynaptic dopamine receptor sensitivity.

    Main Methods:

    • Rats received repeated doses of methamphetamine or saline for 14 days.
    • Apomorphine was administered to assess its effects on 3,4-dihydroxyphenylacetic acid (DOPAC) and dopamine (DA) levels in various brain regions.
    • Measurements were taken during withdrawal.

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    Main Results:

    • Apomorphine dose-dependently decreased DOPAC levels in saline-treated rats.
    • This decrease was attenuated in the olfactory tubercle and nucleus accumbens of methamphetamine-treated rats, particularly at lower apomorphine doses.
    • No significant attenuation was observed in the striatum or cortex.

    Conclusions:

    • Subchronic methamphetamine administration may induce hyposensitivity of presynaptic dopamine receptors in mesolimbic regions.
    • This hyposensitivity could contribute to the behavioral enhancement observed with amphetamine use.