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Serotonergic mechanisms in myoclonus.

Journal of Neural Transmission. Supplementum

|January 1, 1979

Summary

Post-hypoxic intention myoclonus may stem from low serotonin. Administering serotonin precursors like tryptophan can suppress myoclonus in some patients, but not all.

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Area of Science:

Neuroscience
Biochemistry

Background:

Post-hypoxic intention myoclonus is a neurological disorder potentially linked to deficient central serotonergic tone.
Serotonin, a key neurotransmitter, plays a crucial role in regulating motor control and mood.

Observation:

Patients with post-hypoxic intention myoclonus often exhibit reduced levels of 5-hydroxyindoleacetic acid (5-HIAA) in cerebrospinal fluid.
Administration of serotonin precursors, tryptophan and 5-hydroxytryptophan, was observed to increase 5-HIAA levels.

Findings:

Tryptophan and 5-hydroxytryptophan administration effectively suppressed myoclonus in patients with post-hypoxic intention myoclonus.
However, serotonin precursor administration was not universally effective and could exacerbate certain myoclonic syndromes, such as those associated with lipid storage diseases.

Implications:

These findings suggest a potential therapeutic role for serotonin precursor supplementation in specific myoclonic syndromes.
Further research is needed to elucidate the precise mechanisms and identify patient subgroups who would benefit most, while considering potential adverse effects.

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