D-aspartate and Therapeutic Exercise

Summary

An important mechanism responsible for clinical recovery after neurological damage of different types is synaptic plasticity. Nervous tissue can enhance or de-energize inter-neuronal transmission at synaptic level in a lasting way. By increasing the efficiency of synaptic transmission, through long-term potentiation (LTP), it is possible to compensate for the loss of synaptic pulses on survived neurons due to brain damage and to restore their function. At synaptic level, LTP is mainly regulated by NMDA receptors. In animal models induction of plasticity in surviving neurons through the stimulation of NMDA receptors has been shown to limit the clinical manifestations of neuronal damage. Endogenous NMDA is synthesized by methylation of D-aspartate (Asp) by D-aspartatoartate methyltransferase . Moreover, Asp acts as a neurotransmitter capable of activating the NMDA receptor, since its biosynthesis, degradation, absorption and release occurs in the pre-synaptic neuron, and its release determines a response in Post-synaptic neurons. The expression of Asp in the SNC is very abundant during the embryonic period and in early years, whereas it is significantly reduced in adulthood. Consistent with Asp ability of activating the NMDA receptor, recent studies have shown that oral administration of Asp increases LTP induction in mice. Preliminary studies by our group also showed an increase in LTP amplitude in subjects suffering from progressive forms of Multiple Sclerosis after 2 weeks of daily per os intake of 2660mg Asp. It is also well known that the therapeutic exercise that characterizes a rehabilitative treatment is able to induce various benefits to the physical-functional and the cognitive-emotional spheres. In this regard, it has been extensively demonstrated how repeatedly performing a motor task can increase cortical excitability through the induction of LTP mechanisms. Hypothesis Pharmacologically promoting the induction of cortical LTP by the intake of Asp in subjects with various types of brain damage (eg Multiple Sclerosis, Parkinson's Disease, Dementia) may favor the therapeutic effects of rehabilitative treatment. Specific Objectives Evaluate the effects of Asp in improving the outcome of rehabilitative treatment resulting from brain damage of different origin.

Timeline

Start

2017-11-22

Primary completion

2020-07-01

Completion

2022-12-01

Publications

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