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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.
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