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  • Title: Increased D-aspartate brain content rescues hippocampal age-related synaptic plasticity deterioration of mice.
    Author: Errico F, Nisticò R, Napolitano F, Mazzola C, Astone D, Pisapia T, Giustizieri M, D'Aniello A, Mercuri NB, Usiello A.
    Journal: Neurobiol Aging; 2011 Dec; 32(12):2229-43. PubMed ID: 20097447.
    Abstract:
    Until recently, free d-amino acids were thought to be involved only in bacterial physiology. Nevertheless, today there is evidence that D-serine, by acting as co-agonist at NMDARs, plays a role in controlling neuronal functions in mammals. Besides D-serine, another D-amino acid, D-aspartate (D-Asp), is found in the mammalian brain with a temporal gradient of occurrence: high in embryo and low in adult. In this study, we demonstrate that D-Asp acts as an endogenous NMDAR agonist, since it triggers currents via interaction with each of NR2A-D receptor subunits. According to its pharmacological features, we showed that oral administration of D-Asp strongly enhances NMDAR-dependent LTP in adulthood and, in turn, completely rescues the synaptic plasticity decay observed in the hippocampus of aged animals. Therefore, our findings suggest a tantalizing hypothesis for which this in-embryo-occurring D-amino acid, when "forced" over its physiological content, may disclose plasticity windows inside which it counteracts the age-related reduction of NMDAR signaling.
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