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Trigeminovascular stimulation in conscious rats
R H Kemper1, W J Meijler, G J Ter Horst
1Department of Psychiatry, University Hospital Groningen, The Netherlands.
Neuroreport
|March 24, 1997
Summary
Capsaicin infusion in rats activated trigeminal nerves, altering behavior and c-fos expression. This provides a model for studying anti-migraine drug effects on trigeminovascular pathways.
Area of Science:
- Neuroscience
- Pharmacology
Background:
- The trigeminovascular system plays a key role in migraine pathophysiology.
- Understanding intracranial trigeminal activation is crucial for developing effective migraine treatments.
Purpose of the Study:
- To investigate the behavioral and neural effects of intracranial trigeminovascular stimulation.
- To establish a rat model for studying central-acting anti-migraine drugs.
Main Methods:
- Intracisternal infusion of capsaicin in conscious rats to induce trigeminovascular stimulation.
- Observation and analysis of animal behavior.
- Examination of c-fos expression in the trigeminal nucleus caudalis.
Main Results:
- Capsaicin induced dose-dependent reductions in exploratory behavior.
- Specific behaviors like head grooming and scratching were observed, indicating extracranial trigeminal stimulation.
- Capsaicin altered c-fos expression in the trigeminal nucleus caudalis.
Conclusions:
- Intracranial trigeminovascular stimulation can be reliably induced using capsaicin.
- Behavioral analysis in this model reflects trigeminal activation.
- This model offers a valuable tool for evaluating anti-migraine medications targeting central pathways.