N-Methyl-D-aspartic acid

N-Methyl-D-aspartic acid (NMDA) is a synthetic substance that mimics the action of glutamate, the naturally occurring excitatory neurotransmitter in the brain. NMDA acts at NMDA receptors to produce its biological effects.

Chemistry

NMDA is a derivative of aspartic acid, a type of amino acid. The chemical structure of NMDA is similar to that of glutamate, which allows it to bind to and activate NMDA receptors in the brain.

Pharmacology

NMDA receptors are a type of ionotropic glutamate receptor. Activation of these receptors by NMDA or glutamate leads to the opening of an ion channel that is nonselective to cations. This allows the flow of Na+ and small amounts of Ca2+ ions into the cell and K+ out of the cell.

Clinical significance

NMDA receptors are crucial for controlling synaptic plasticity and memory function. Overactivation of these receptors can lead to excitotoxicity, which is thought to play a role in the pathogenesis of several neurological disorders, including Alzheimer's disease, Parkinson's disease, and Huntington's disease. Conversely, underactivation of NMDA receptors is implicated in conditions such as schizophrenia and depression.

See also

• Glutamate receptor
• Excitotoxicity
• Neurotransmitter

References

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