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3D-Neuronavigation In Vivo Through a Patient's Brain During a Spontaneous Migraine Headache
Published on: June 2, 2014
Sumatriptan normalizes the migraine attack-related increase in brain serotonin synthesis
1Department of Neurology and Neurosurgery, Montreal Neurological Institute, McGill University, Montréal, Québec, Canada.
Neurology
|February 6, 2008
Summary
Migraine patients show altered brain serotonin (5-HT) synthesis, with increased levels during attacks and reduced levels after sumatriptan treatment. Interictally, a low cortical serotonergic tone is observed in migraineurs.
Area of Science:
- Neuroscience
- Biochemistry
Background:
- Altered serotonin (5-HT) neurotransmission is a suspected factor in migraine pathophysiology.
- Investigating 5-HT synthetic rates offers insights into migraine mechanisms.
Purpose of the Study:
- To evaluate in vivo brain serotonin (5-HT) synthetic rates in migraine patients during attacks, interictally, and after sumatriptan treatment using PET.
- To compare these rates with normal controls.
Main Methods:
- Positron Emission Tomography (PET) with alpha-[(11)C]methyl-l-tryptophan was used.
- Six migraine patients were scanned during spontaneous attacks, after sumatriptan, and interictally.
- Head pain and 5-HT synthetic rates were assessed in various brain regions.
Main Results:
- Brain 5-HT synthesis was highest during migraine attacks and lowest after sumatriptan administration.
- Migraine patients showed significantly lower 5-HT synthetic rates after sumatriptan compared to controls.
- Interictally, migraine patients exhibited a trend towards lower global brain 5-HT synthetic rates, with notable reductions in specific cortical areas.
Conclusions:
- Migraine patients may have a reduced cortical serotonergic tone between attacks.
- Brain 5-HT synthesis increases during migraine attacks.
- Triptans appear to downregulate brain 5-HT synthesis and modulate pain pathways.
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