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Central 5-HT receptor hypersensitivity in migraine without aura
E M Cassidy1, E Tomkins, T Dinan
1Migraine/Headache Clinic, Department of Neurology, Royal College of Surgeons in Ireland, Beaumont Hospital, Dublin, Ireland. eucass@hotmail.com
Cephalalgia : an International Journal of Headache
|January 22, 2003
Summary
Migraine without aura is linked to hypersensitive central 5-HT1A receptors. This study used buspirone to measure prolactin response, finding a significantly greater reaction in migraine patients compared to controls.
Area of Science:
- Neuroscience
- Pharmacology
- Neurology
Background:
- Serotonin is a key neurotransmitter in migraine pathophysiology.
- Central 5-HT1A receptor sensitivity in migraine remains under-researched.
- 5-HT1A receptors regulate central serotonergic tone.
Purpose of the Study:
- To test if migraine without aura is associated with hypersensitive central 5-HT1A receptors.
- To evaluate 5-HT1A receptor sensitivity using a neuroendocrine challenge.
- To compare serum prolactin responses between migraine patients and healthy controls.
Main Methods:
- 12 female subjects with migraine without aura and 16 matched healthy controls were enrolled.
- Serum prolactin levels were measured at baseline and every 30 minutes for 3 hours after a single oral dose of buspirone (a 5-HT1A-receptor agonist).
- Testing was conducted during the first 5 days of the menstrual cycle, excluding subjects on psychotropic or prophylactic medications.
Main Results:
- No significant difference in baseline prolactin levels between the migraine and control groups.
- Buspirone administration caused a significant prolactin increase in both groups.
- Migraine subjects exhibited a significantly greater maximal prolactin response to buspirone compared to controls (P < 0.001).
Conclusions:
- The findings support the hypothesis of central 5-HT1A receptor hypersensitivity in migraine without aura.
- This hypersensitivity may be relevant to the regulation of raphe 5-HT tone.
- Potential implications for understanding the links between migraine, anxiety, and depression.