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Since their discovery in the mammalian CNS, D-aspartate and D-serine have aroused a strong interest with regard to their role as putative neuromodulatory molecules. Whereas the functional role of D-serine as an endogenous coagonist of NMDA receptors (NMDARs) has been elucidated, the biological significance of D-aspartate in the brain is still mostly unclear. In the present study, we demonstrated that nonphysiological high levels of D-aspartate (1) increased in vivo NMDAR activity, (2) attenuated prepulse inhibition deficits induced by amphetamine and MK-801 [(+)-5-methyl-10,11-dihydro-5H-dibenzo[a,d]-cyclohepten-5,10-imine hydrogen maleate], (3) produced striatal adaptations of glutamate synapses resembling those observed after chronic haloperidol treatment, and (4) enhanced hippocampal NMDAR-dependent memory. This evidence was obtained using two different experimental strategies that produced an abnormal increase of endogenous D-aspartate levels in the mouse: a genetic approach based on the targeted deletion of the D-aspartate oxidase gene and a pharmacological approach based on oral administration of D-aspartate. This work provides in vivo evidence of a neuromodulatory role exerted by D-aspartate on NMDAR signaling and raises the intriguing hypothesis that also this D-amino acid, like D-serine, could be used as a therapeutic agent in the treatment of schizophrenia-related symptoms.

d-Aspartate Prevents Corticostriatal Long-Term Depression and Attenuates Schizophrenia-Like Symptoms Induced by Amphetamine and MK-801