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J Pharm Biomed Anal. 2015 Dec 10;116:7-17. doi: 10.1016/j.jpba.2015.03.024. Epub 2015 Mar 31.

D-Aspartate: An endogenous NMDA receptor agonist enriched in the developing brain with potential involvement in schizophrenia.

Author information

1
Laboratory of Behavioural Neuroscience, Ceinge Biotecnologie Avanzate, 80145 Naples, Italy; Department of Molecular Medicine and Medical Biotechnology, University of Naples "Federico II", 80138 Naples, Italy. Electronic address: erricof@ceinge.unina.it.
2
Centre de Recherche en Neurobiologie et Neurophysiologie de Marseille, Aix-Marseille Université UMR7286 CNRS, 13344 Marseille Cedex 15, France.
3
Laboratory of Behavioural Neuroscience, Ceinge Biotecnologie Avanzate, 80145 Naples, Italy; Department of Environmental, Biological and Pharmaceutical Sciences and Technologies, The Second University of Naples (SUN), 81100 Caserta, Italy.

Abstract

Free D-aspartate and D-serine occur at substantial levels in the mammalian brain. D-Serine is a physiological endogenous co-agonist for synaptic N-Methyl D-Aspartate (NMDA) receptors (NMDARs), and is involved in the pathophysiology of schizophrenia. Much less is known about the biological meaning of D-aspartate. D-Aspartate is present at high levels in the embryo brain and strongly decreases at post-natal phases. Temporal reduction of D-aspartate levels depends on the post-natal onset of D-aspartate oxidase (DDO), an enzyme able to selectively catabolize this D-amino acid. Pharmacological evidence indicates that D-aspartate binds to and activates NMDARs. Characterization of genetic and pharmacological mouse models with abnormally higher levels of D-aspartate has evidenced that increased D-aspartate enhances hippocampal NMDAR-dependent synaptic plasticity, dendritic morphology and spatial memory. In line with the hypothesis of a hypofunction of NMDARs in the pathogenesis of schizophrenia, it has been shown that increased D-aspartate levels also improve brain connectivity, produce corticostriatal adaptations resembling those observed after chronic haloperidol treatment, and protects against prepulse inhibition deficits and abnormal circuits activation induced by psychotomimetic drugs. In healthy humans, genetic variation predicting reduced expression of DDO in post-mortem prefrontal cortex is associated with greater prefrontal gray matter and activity during working memory. On the other side, evaluation of D-aspartate content in post-mortem patients with schizophrenia has shown a significant reduction of this D-amino acid in the prefrontal cortex and striatum. Generation of mouse models with reduced embryonic levels of D-aspartate may disclose unprecedented role for D-aspartate in developmental brain processes associated with vulnerability to psychotic-like symptoms.

KEYWORDS:

NMDA receptor; Schizophrenia; d-Aspartate; d-Aspartate oxidase; d-Serine

PMID:
25868730
DOI:
10.1016/j.jpba.2015.03.024
[Indexed for MEDLINE]

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