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Effects of methamphetamine on atropine-induced conditioned gustatory avoidance
Pharmacology, Biochemistry, and Behavior
|April 1, 1984
Summary
High-dose methamphetamine exposure reduces avoidance responses to atropine in rats and monkeys. This suggests the monoaminergic system plays a role in atropine
Area of Science:
- Neuroscience
- Pharmacology
- Behavioral Science
Background:
- Repeated high-dose methamphetamine (MA) administration causes monoaminergic damage in animal models.
- The central nervous system involves complex interactions between cholinergic and monoaminergic systems.
Purpose of the Study:
- To investigate the impact of prior methamphetamine exposure on the conditioned gustatory avoidance response to atropine in rhesus monkeys and rats.
- To determine if stimulant-induced, non-specific effects, rather than monoaminergic damage, alter sensitivity to atropine's aversive properties.
Main Methods:
- Rhesus monkeys and rats with prior high-dose methamphetamine exposure were tested in a conditioned gustatory avoidance paradigm using atropine as the unconditioned stimulus.
- Control groups and a methylphenidate-exposed group (a stimulant without catecholaminergic damage) were used for comparison.
Main Results:
- Methamphetamine-pretreated animals exhibited significantly reduced avoidance responses to atropine compared to controls.
- Rats pretreated with methylphenidate showed no alteration in atropine-induced avoidance, indicating the effect is specific to monoaminergic alterations.
Conclusions:
- Prior methamphetamine exposure attenuates atropine's aversive effects, suggesting a role for the monoaminergic system.
- Atropine's avoidance-inducing properties may be, in part, mediated by the central monoaminergic system.