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Raclopride reduces sucrose preference in rats
Pharmacology, Biochemistry, and Behavior
|January 1, 1995
Summary
Dopamine D2 receptor blockade with raclopride reduced the reinforcing effects of sweet taste. This suggests dopamine pathways are crucial for mediating the rewarding properties of food.
Area of Science:
- Neuroscience
- Behavioral Neuroscience
- Pharmacology
Background:
- Dopaminergic D1 and D2 antagonists reduce sweet solution intake during sham feeding.
- This reduction occurs independently of deficits in ingestion initiation or motor performance.
Purpose of the Study:
- To investigate if raclopride decreases intake by reducing the reinforcing potency of orosensory stimulation from sucrose.
- To test the hypothesis that central dopaminergic mechanisms mediate food's reinforcing effects.
Main Methods:
- Rats were trained to consume two flavored sucrose solutions.
- Preferred solution paired with raclopride, non-preferred with vehicle.
- Preference tests conducted after repeated pairings to assess raclopride's effect on reinforcing potency.
Main Results:
- Preference for the raclopride-paired sucrose solution significantly decreased after repeated pairings.
- This indicates raclopride diminished the reinforcing value of sucrose's orosensory properties.
Conclusions:
- Raclopride reduces the reinforcing potency of sucrose orosensory stimulation.
- Findings support the role of central dopaminergic mechanisms in mediating the reinforcing effects of food.