Modulation of dopamine mediated phosphorylation of AMPA receptors by PSD-95 and AKAP79/150

Communication between dopaminergic and glutamatergic synapses is critical for several functions related to cognition and emotion. Here, we examined whether dopamine receptor activity regulates phosphorylation and trafficking of the alpha-amino-3-hydroxy-5-methylisoxazole-4-propionic acid (AMPA) receptor subunit, GluR1. We find treatment with a dopamine D1 receptor agonist enhanced GluR1 phosphorylation at Ser845, the PKA phosphorylation site, in both striatal and prefrontal cortical neurons. Enhanced phosphorylation of GluR1 also correlated with increased amounts of GluR1 on the cell surface. These effects were disrupted by expression of mutant forms of the A-kinase anchoring protein (AKAP79/150) and the postsynaptic density protein, PSD-95, that fail to target synaptic sites. Similar enhancement of the phosphorylation of GluR1 was observed in the nucleus accumbens upon stimulation of dopamine release in vivo using electrical stimulation of dopamine cell bodies in the ventral tegmental area. These results suggest in vivo stimulation of dopamine release directly influences AMPA receptor phosphorylation and together with in vitro data indicate that coupling of the AMPA receptor to AKAP79/150 and PSD-95 modulate this process.

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