What is the migraine center theory of migraine headache pathogenesis?

Updated: Oct 21, 2019
  • Author: Jasvinder Chawla, MD, MBA; Chief Editor: Helmi L Lutsep, MD  more...
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Answer

A potential "migraine center" in the brainstem has been proposed, based on PET-scan results showing persistently elevated rCBF in the brainstem (ie, periaqueductal gray, midbrain reticular formation, locus ceruleus) even after sumatriptan-produced resolution of headache and related symptoms. These were the findings in 9 patients who had experienced spontaneous attack of migraine without aura. The increased rCBF was not observed outside of the attack, suggesting that this activation was not due to pain perception or increased activity of the endogenous antinociceptive system.

The fact that sumatriptan reversed the concomitant increased rCBF in the cerebral cortex but not the brainstem centers suggests dysfunction in the regulation involved in antinociception and vascular control of these centers. Thalamic processing of pain is known to be gated by ascending serotonergic fibers from the dorsal raphe nucleus and from aminergic nuclei in the pontine tegmentum and locus ceruleus; the latter can alter brain flow and blood-brain barrier permeability.

Because of the set periodicity of migraine, linkage to the suprachiasmatic nucleus of the hypothalamus that governs circadian rhythm has been proposed. Discovering the central trigger for migraine would help to identify better prophylactic agents.


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