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Previous work has shown a selective sensitivity of striatal D2-receptor-containing neurons (D2 cells) to kainic acid (KA). In order to see whether this phenomenon exists in cultured cells, which could provide a very accessible model for subsequent mechanistic studies, we examined striatal cultures grown for up to 30 days and labeled with either [3H]spiperone, for D2 receptors, or with [3H]-SCH23390, for D1 receptors. Analysis of the cells was performed with a digital imaging system (RAS). The cultured cells were examined for ligand binding to receptors, cell size, and susceptibility to KA. The D2 cells showed an increased mortality over D1-receptor-containing neurons (D1 cells) in the presence of KA, of a magnitude similar to in vivo loss, with larger D2 cells showing the greatest vulnerability.
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