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The trigemino-vascular system and migraine
1I Clinica Neurologica, Dipartimento di Scienze Neurologiche, Università degli Studi La Sapienza, Rome, Italy.
Pathologie-Biologie
|April 1, 1992
Summary
Neurogenic inflammation plays a role in migraine and cluster headaches. Antimigraine drugs like sumatriptan block this inflammation by activating specific receptors on sensory nerves.
Area of Science:
- Neuroscience
- Pharmacology
- Inflammation Research
Background:
- Neurogenic inflammation is implicated in the pathophysiology of primary headache disorders such as migraine and cluster headache.
- Trigeminal nerve activation leads to inflammatory responses in the dura mater, including plasma protein extravasation and mast cell degranulation.
Purpose of the Study:
- To investigate the role of neurogenic inflammation in headache mechanisms.
- To determine the effect of antimigraine drugs on trigeminal-mediated neurogenic inflammation.
Main Methods:
- Electrical stimulation of the trigeminal ganglion in rats.
- Assessment of plasma protein extravasation and ultrastructural changes in the dura mater.
- Measurement of calcitonin gene-related peptide (CGRP) levels.
- Evaluation of the effects of sumatriptan and dihydroergotamine.
Main Results:
- Trigeminal nerve stimulation induced plasma extravasation, mast cell activation, and ultrastructural alterations in rat dura mater.
- Sumatriptan and dihydroergotamine effectively inhibited these inflammatory changes.
- These drugs also prevented the increase in plasma CGRP levels.
Conclusions:
- The findings support the involvement of neurogenic inflammation in migraine and cluster headache pathogenesis.
- Antimigraine drugs sumatriptan and dihydroergotamine exert their anti-inflammatory effects via 5-HT1D/1B receptor activation on trigeminal sensory fibers.
- This mechanism highlights a potential therapeutic target for headache disorders.