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Peripheral and central sensitization during migraine
1Department of Neurobiology, Program in Neuroscience, Harvard Medical School, Boston, MA, USA.
Functional Neurology
|February 24, 2001
Summary
Migraine pain involves chemical activation of meningeal nerves. This study shows this activation causes peripheral and central sensitization in pain pathways, explaining migraine symptoms like throbbing pain and scalp tenderness.
Area of Science:
- Neuroscience
- Pain Research
- Migraine Pathophysiology
Background:
- Migraine pain theories focus on meningeal perivascular fiber activation.
- Understanding the trigeminovascular system's role in migraine is crucial.
Purpose of the Study:
- To investigate the effects of chemical activation of meningeal primary afferent nociceptors in an animal migraine model.
- To elucidate the mechanisms underlying migraine pain, including peripheral and central sensitization.
Main Methods:
- Utilized an animal model to study migraine pathophysiology.
- Focused on chemical activation of dural innervating primary afferent nociceptors.
- Assessed sensitization to intracranial and extracranial stimuli and cardiovascular responses.
Main Results:
- Chemical activation induced peripheral sensitization of nociceptors to mechanical stimuli.
- Central sensitization of trigeminovascular neurons occurred, responding to extracranial stimuli.
- Facilitated cardiovascular pressor responses, indicative of pain, were observed.
Conclusions:
- First evidence for peripheral and central sensitization induced by dural input along trigeminovascular pathways.
- Migraine pain is primarily mediated by peripheral sensitization and secondarily by central sensitization.
- Scalp tenderness in migraine is mainly attributed to central sensitization.