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5-Hydroxytryptophan and sleep in Down's syndrome
Journal of the Neurological Sciences
|November 1, 1975
Summary
This study investigated the effects of 5-hydroxytryptophan (5-HTP) on sleep patterns in infants with Down syndrome. While 5-HTP showed short-term effects on eye movements, it did not normalize sleep patterns long-term, though it improved muscle tone and motor behavior.
Area of Science:
- Neuroscience
- Developmental Biology
- Pharmacology
Background:
- Infants with Down syndrome (mongoloid infants) often exhibit altered sleep patterns.
- 5-hydroxytryptophan (5-HTP) is a precursor to serotonin, a neurotransmitter implicated in sleep regulation.
Purpose of the Study:
- To investigate the long-term effects of oral 5-HTP supplementation on sleep polygraphy in infants with Down syndrome.
- To analyze the impact of 5-HTP on paradoxical sleep (PS) and eye-movement (EM) density.
Main Methods:
- Polygraphic sleep recordings (EEG, EOG, EMG) were conducted on 6 infants with Down syndrome receiving oral 5-HTP for 12-36 months.
- Oculomotor activity during paradoxical sleep was selectively analyzed, focusing on eye-movement density and frequency.
Main Results:
- Non-treated infants with Down syndrome showed significantly decreased eye-movement density compared to normal infants.
- 5-HTP treatment resulted in normalized eye-movement density in only 2 out of 5 treated infants.
- 5-HTP did not induce long-term changes in eye-movement frequencies, with effects lasting up to 8 days.
Conclusions:
- 5-HTP supplementation did not normalize paradoxical sleep eye-movement patterns in infants with Down syndrome in the long term.
- The primary long-lasting benefits observed were increased muscle tone and improved motor behavior.
- Further research is needed to understand the neurobiological mechanisms underlying sleep disturbances in Down syndrome and the potential therapeutic roles of 5-HTP.