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We examined D2-dopamine receptor containing neurons in cultures of neonatal rat striatum for apoptosis following dopamine treatment. Exposure to cultures to micromolar concentrations of dopamine resulted in 60-70% killing of D2-dopamine receptor neurons within 24 hr. We also utilized a double labeling procedure to determine that treatment with dopamine induced apoptosis in D2-dopamine receptor containing neurons. These results suggest that loss of D2-dopamine receptor containing neurons during aging could be due to an apoptotic effect of dopamine.
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