EXCITATORY AMINO-ACIDS, FREE-RADICALS AND THE PATHOGENESIS OF MOTOR-NEURON DISEASE

The cause of motor neuron disease (MND) remains unknown, but the patho genic involvement of excitatory amino acid (EAA) neurotransmitters and related exogenous compounds has been proposed. We discuss current con cepts of the mechanisms of action of EAAs and the evidence for links b etween these neurotransmitters and free radical hypotheses of neuronal damage. These concepts are especially pertinent following reports of mutations in the gene encoding the free radical scavenging enzyme, cop per-zinc superoxide dismutase, in familial MND, New approaches to trea tment are suggested by advances in understanding of the disease.