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Effect of age and cinnarizine treatment on brain dopamine receptors
M Camps1, S Ambrosio, J Reiriz
1Biochemistry Unit, School of Medcine, University of Barcelona, Spain.
Abstract:
The density and distribution of dopamine D1 and D2 receptors visualized by in vitro autoradiography were investigated in adult and senescent BL C57 mice. A significant decrease was observed in regions of the basal ganglia of senescent animals, which was more pronounced for the D1 subtype. Chronic treatment with cinnarizine, an organic Ca2+ channel antagonist, alters both D1 and D2 receptor densities, with a higher sensitivity of the D1 subtype. These results could indicate that the interactions between dopamine receptor subtypes may be necessary for the full expression of behavioral events mediated by the D2 receptors.
Insights
Dopamine D1 and D2 receptor density decreases in aging mice, particularly D1. Cinnarizine treatment also affects these dopamine receptors, suggesting subtype interactions are crucial for D2 receptor-mediated behaviors.
Area of Science:
- Neuroscience
- Pharmacology
- Aging Research
Background:
- Dopamine receptors (D1 and D2) play critical roles in brain function.
- Age-related changes in neurotransmitter systems are common but not fully understood.
- Dopamine receptor subtypes exhibit distinct distributions and functions.
Purpose of the Study:
- To investigate age-related changes in dopamine D1 and D2 receptor density and distribution.
- To examine the effects of chronic cinnarizine treatment on dopamine receptor subtypes.
- To explore potential interactions between dopamine receptor subtypes.
Main Methods:
- In vitro autoradiography was used to visualize and quantify receptor densities.
- Adult and senescent BL C57 mice were utilized as model organisms.
- Chronic administration of cinnarizine, a calcium channel antagonist, was performed.
Main Results:
- Senescent mice showed a significant decrease in D1 and D2 receptor densities in basal ganglia regions.
- The decrease in receptor density was more pronounced for the D1 subtype in aging mice.
- Chronic cinnarizine treatment altered both D1 and D2 receptor densities, with D1 being more sensitive.
Conclusions:
- Aging is associated with reduced dopamine D1 and D2 receptor availability in the basal ganglia.
- Dopamine D1 receptors are more sensitive to age-related decline and cinnarizine effects.
- Interactions between dopamine receptor subtypes may be essential for D2 receptor-mediated behaviors.