“…Scale bar, 50 m. inducing expression of immediate-early genes, including Egr1 and arc, which play a crucial role in reference memory (Guzowski et al, 2000;Jones et al, 2001). Alternatively, D 1 Rs could directly phosphorylate NMDA receptors or the protein kinase C isoform in hippocampus and amygdala, potentiating and maintaining synaptic strength (Gardner et al, 2001;Impey et al, 2002;Kelleher et al, 2004;Sacktor, 2008;Yao et al, 2008) by increasing the influx of calcium induced by NMDA receptor activation, as occurs in prefrontal cortex neurons (Kruse et al, 2009). Direct interaction between D 1 and NMDA receptors within the plasma membrane of pyramidal neurons may also occur, since D 1 R can physically interact with NR1 and NR2A subunits, modulating receptor trafficking (Lee et al, 2002;Pei et al, 2004;Fiorentini et al, 2006).…”