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Related Experiment Videos

Methamphetamine plus scopolamine potentiates behavioral sensitization and conditioning

K Yui1, T Miura, K Sugiyama

  • 1Medical Care Section, Urawa Juvenile Classification Home, Ministry of Justice, Japan.

European Journal of Pharmacology
|June 12, 1995
PubMed
Summary

Repeated co-administration of methamphetamine and scopolamine in rats induced more vigorous behavioral sensitization and enhanced drug conditioning compared to methamphetamine alone. This suggests a complex interplay between dopaminergic and cholinergic systems.

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Area of Science:

  • Neuroscience
  • Pharmacology
  • Behavioral Science

Background:

  • Methamphetamine is a psychostimulant with high abuse potential.
  • Scopolamine is an anticholinergic drug.
  • The combined effects of methamphetamine and scopolamine on behavior are not fully understood.

Purpose of the Study:

  • To compare the effects of repeated methamphetamine plus scopolamine treatment versus methamphetamine treatment alone on behavioral sensitization and drug conditioning in rats.
  • To investigate the role of dopaminergic and cholinergic systems in these effects.

Main Methods:

  • Rats received repeated treatments of methamphetamine (4.0 mg/kg) plus scopolamine (0.5 mg/kg) or methamphetamine alone.
  • Behavioral sensitization was assessed by observing responses to drug administration.

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  • Drug conditioning was evaluated by associating a tone with the drug state and testing conditioned responses.

    • Main Results:

    • Combined methamphetamine and scopolamine treatment induced more vigorous behavioral sensitization than methamphetamine alone.
    • Sensitized responses were observed to methamphetamine plus scopolamine, methamphetamine, and to a lesser extent, scopolamine.
    • Rats treated with both drugs exhibited conditioned responses to a drug-associated tone, unlike those treated with methamphetamine alone.

    Conclusions:

    • Robust behavioral sensitization from combined methamphetamine and scopolamine treatment may enhance drug conditioning.
    • These effects are potentially mediated by a reciprocal balance between dopaminergic and cholinergic systems, favoring dopaminergic dominance.
    • Conditioning to drug-associated cues may involve a similar neurotransmitter system balance.