Summary
Effects of blocking N-methyl-D-aspartic acid (NMDA) and non-NMDA glutamatergic receptors on performance in the hole board test was studied in male rats bilaterally cannulated into the nucleus accumbens (Acc). Rats, divided into 5 groups, received either 1 µl injections of saline, (±) 2-amino-7-phosphonoheptanoic acid (AP-7) (0.5 or 1 µg) or 2,3-dioxo-6-nitro-1,2,3,4,tetrahydrobenzo-(f)quinoxaline-7-sulphonamide disodium (NBQX, 0.5 or 1 µg) 10 min before testing. An increase by AP-7 was observed in ambulatory movements (0.5 µg; p < 0.05), non-ambulatory movements and number of movements (1 µg; p < 0.05); sniffing and total exploration (1 µg; p < 0.01). When holes were considered in order from the first to the fifth by the number of explorations, the most visited holes (first and second) of the AP-7 group were significantly higher than the corresponding holes of saline group (p < 0.05 for 0.5 µg and p < 0.001 for 1 µg). When the second hole was compared with the first of his group, a difference was only observed in the AP-7 1 µg group (p < 0.001). Increasing differences between the other holes and the first were observed by drug treatment. At molecular level, it was observed that AP-7 induced an increase of the coat protein AP-2 expression in Acc, but not AP-180 neither the synaptic protein synaptophysin. The increase of AP-2 was also observed in the medial prefrontal cortex by the action of AP-7 but not NBQX. We conclude that NMDA glutamatergic blockade might induce an activation of the endocytic machinery into the Acc, leading to stereotypies and perseverations, lacking cortical intentional direction.
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Baiardi, G., Ruiz, A., Beling, A. et al. Glutamatergic ionotropic blockade within accumbens disrupts working memory and might alter the endocytic machinery in rat accumbens and prefrontal cortex. J Neural Transm 114, 1519–1528 (2007). https://doi.org/10.1007/s00702-007-0776-7
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DOI: https://doi.org/10.1007/s00702-007-0776-7