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Impaired 5-hydroxytryptamine tachyphylaxis in migraine.
Cephalalgia : an International Journal of Headache
|September 1, 1983
Summary
Tachyphylaxis to serotonin (5HT) in hand veins is reversed by naloxone, suggesting local opioid involvement. This tachyphylaxis is notably absent in migraine patients, offering new insights into vascular responses.
Area of Science:
- Pharmacology
- Vascular Physiology
- Neuroscience
Background:
- Tachyphylaxis to serotonin (5HT) affects vascular smooth muscle spasm.
- Understanding the mechanisms of 5HT tachyphylaxis is crucial for vascular research.
- Migraine patients exhibit altered vascular reactivity.
Purpose of the Study:
- To investigate the phenomenon of tachyphylaxis to 5HT in human superficial hand dorsal veins.
- To explore the role of naloxone in modulating 5HT-induced vascular spasm.
- To compare 5HT tachyphylaxis between healthy individuals and migraineurs.
Main Methods:
- Utilized a computerized venotest for in vivo assessment of vascular responses.
- Administered 5HT to superficial hand dorsal veins to induce spasm.
- Applied local naloxone administration prior to 5HT challenge.
Main Results:
- Demonstrated reproducible tachyphylaxis to 5HT's spasmogenic activity in vivo.
- Observed that previous local naloxone administration reverted the 5HT-induced tachyphylaxis.
- Found that tachyphylaxis to 5HT was generally absent in migraineurs.
Conclusions:
- Naloxone's ability to restore 5HT spasmogenic effect suggests local opioid apparatus participation in tachyphylaxis.
- The absence of 5HT tachyphylaxis in migraineurs indicates potential differences in vascular regulatory mechanisms.
- Findings open avenues for exploring opioid involvement in vascular control and migraine pathophysiology.