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D-Aspartic acid is a novel endogenous neurotransmitter

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Author(s)

Salvatore D'Aniello, Ildiko Maureen Lara Somorjai, Jordi Garcia-Fernandez, Enza Topo, Antimo D'Aniello

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Abstract

D-Aspartic acid (D-Asp) is present in invertebrate and vertebrate neuroendocrine tissues, where it carries out important physiological functions and is implicated in nervous system development. We show here that D-Asp is a novel endogenous neurotransmitter in two distantly related animals, a mammal (Rattus norvegicus) and a mollusk (Loligo vulgaris). Our main findings demonstrate that D-Asp is present in high concentrations in the synaptic vesicles of axon terminals; synthesis for this amino acid occurs in neurons by conversion of L-Asp to D-Asp via D-aspartate racemase; depolarization of nerve endings with K+ ions evokes an immediate release of D-Asp in a Ca2+ dependent manner; specific receptors for D-Asp occur at the postsynaptic membrane, as demonstrated by binding assays and by the expansion of squid skin chromatophores; D-aspartate oxidase, the specific enzyme that oxidizes D-Asp, is present in the postsynaptic membranes; and stimulation of nerve endings with D-Asp triggers signal transduction by increasing the second messenger cAMP. Taken together, these data demonstrate that D-Asp fulfills all criteria necessary to be considered a novel endogenous neurotransmitter. Given its known role in neurogenesis, learning, and neuropathologies, our results have important implications for biomedical and clinical research.-D'Aniello, S., Somorjai, I., Garcia-Fernandez, J., Topo, E., D'Aniello, A. D-Aspartic acid is a novel endogenous neurotransmitter. FASEB J. 25, 1014-1027 (2011). www.fasebj.org

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Original languageEnglish
Pages (from-to)1014-1027
Number of pages14
JournalFASEB Journal
Volume25
Issue number3
DOIs
Publication statusPublished - Mar 2011

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