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Effects of ventral pallidal D1 dopamine receptor activation on memory consolidation in morris water maze test
László Péczely1, Tamás Ollmann1, Kristóf László1
1Institute of Physiology, Pécs University Medical School, Pécs, Hungary.
Abstract:
In the present experiments, in adult male Wistar rats, the effect of microinjection of the D1 dopamine receptor agonist SKF38393 into the ventral pallidum on memory consolidation, as well as on resistance of the resulting memory trace against extinction were investigated in Morris water maze test. SKF38393 was applied in three doses (0.1, 1.0 or 5.0μg in 0.4μl physiological saline, respectively). To clarify whether the effect of the agonist was specific, in a separate group of animals, the D1 dopamine receptor antagonist SCH23390 (5.0μg in 0.4μl physiological saline) was administered 15min prior to 1.0μg agonist treatment. In another group of animals, the same dose of antagonist was applied by itself. The two lower doses (0.1 and 1.0μg) of the agonist accelerated memory consolidation relative to controls and increased the stability of the consolidated memory trace against extinction. Antagonist pretreatment eliminated the effects of the agonist, thus confirming that the effect was selectively specific to D1 dopamine receptors. Our findings indicate that the ventral pallidal D1 dopamine receptors are intimately involved in the control of the consolidation processes of spatial memory.
Insights
Microinjection of a D1 dopamine receptor agonist into the ventral pallidum enhanced memory consolidation and resistance to extinction in rats. This suggests D1 dopamine receptors in this brain region are crucial for spatial memory formation.
Area of Science:
- Neuroscience
- Dopamine Receptor Research
- Memory Consolidation Studies
Background:
- The ventral pallidum is implicated in reward and motivation.
- Dopamine signaling plays a critical role in learning and memory.
- The specific role of D1 dopamine receptors in the ventral pallidum for memory consolidation is not fully understood.
Purpose of the Study:
- To investigate the effect of the D1 dopamine receptor agonist SKF38393 microinjected into the ventral pallidum on memory consolidation.
- To assess the impact of this agonist on the resistance of memory traces to extinction.
- To determine the specificity of these effects for D1 dopamine receptors.
Main Methods:
- Adult male Wistar rats were used in Morris water maze tests.
- SKF38393 (0.1, 1.0, or 5.0μg) was microinjected into the ventral pallidum.
- Specificity was tested using the D1 dopamine receptor antagonist SCH23390.
- Memory consolidation and resistance to extinction were measured.
Main Results:
- The D1 dopamine receptor agonist SKF38393 at lower doses (0.1 and 1.0μg) accelerated memory consolidation.
- These doses also increased the stability of the consolidated memory trace against extinction.
- Pretreatment with the D1 antagonist SCH23390 blocked the agonist's effects, confirming D1 receptor specificity.
Conclusions:
- Ventral pallidal D1 dopamine receptors are critically involved in the consolidation of spatial memory.
- Activation of these receptors enhances memory formation and persistence.
- This finding highlights a novel role for the ventral pallidum in cognitive processes.
