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Lobeline attenuates d-methamphetamine self-administration in rats.
S B Harrod1, L P Dwoskin, P A Crooks
1Department of Psychology, University of Kentucky, Lexington, Kentucky 40506, USA.
Summary
Alpha-lobeline, a compound that affects dopamine release, was tested for its effect on methamphetamine self-administration in rats. Lobeline reduced methamphetamine seeking, suggesting potential as a novel treatment for stimulant abuse.
Area of Science:
- Neuroscience
- Pharmacology
- Addiction Research
Background:
- Alpha-lobeline is known to inhibit dopamine release in vitro.
- This mechanism suggests a potential role in modulating stimulant-induced behaviors.
Purpose of the Study:
- To investigate the efficacy of alpha-lobeline in reducing d-methamphetamine self-administration in a rat model.
- To determine the specificity of lobeline's effects on stimulant versus natural reward seeking.
Main Methods:
- Rats were trained to self-administer d-methamphetamine or sucrose via lever pressing.
- Rats were pretreated with varying doses of alpha-lobeline before self-administration sessions.
- Tolerance to lobeline's effects was assessed with repeated administration.
Main Results:
- Acute lobeline administration decreased responding for both d-methamphetamine and sucrose.
- Tolerance developed to the effects of lobeline on sucrose seeking with repeated administration.
- Lobeline's inhibitory effect on d-methamphetamine seeking persisted and was not overcome by increasing the drug dose.
Conclusions:
- Acute lobeline administration has a general rate-suppressant effect, to which tolerance can develop.
- Repeated lobeline administration specifically reduces d-methamphetamine self-administration in a noncompetitive manner.
- Lobeline shows promise as a potential pharmacotherapy for d-methamphetamine abuse.