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Pathophysiology of migraine.

G Bussone1

  • 1National Neurological Institute C Besta, Via Celoria 11, I-20133 Milan, Italy. bussone@istituto-besta.it

Neurological Sciences : Official Journal of the Italian Neurological Society and of the Italian Society of Clinical Neurophysiology
|November 19, 2004
PubMed
Summary

Migraine pathogenesis involves central neuronal hyperexcitability, potentially linked to calcium channel gene abnormalities and low magnesium levels. These factors may lower the threshold for migraine attacks triggered by various factors.

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Area of Science:

  • Neuroscience
  • Genetics
  • Biochemistry

Background:

  • The precise mechanisms underlying migraine development are not fully understood.
  • Growing evidence points to a neural basis for migraine, specifically central neuronal hyperexcitability.

Purpose of the Study:

  • To explore the potential role of genetic abnormalities in voltage-gated calcium channels and magnesium levels in migraine pathogenesis.
  • To understand how neuronal hyperexcitability contributes to migraine susceptibility and attack triggers.

Main Methods:

  • Review of existing data on neuronal excitability, calcium channels, and magnesium levels in migraine patients.
  • Hypothesizing the impact of genetic variations on neurotransmitter release and neuronal thresholds.
  • Considering the role of spreading depression in initiating migraine attacks.

Main Results:

  • Central neuronal hyperexcitability is a key physiological disturbance predisposing individuals to migraine.
  • Abnormalities in voltage-gated P/Q type calcium channels may affect neurotransmitter release, potentially lowering the migraine attack threshold.
  • Low magnesium levels are observed in migraine patients, suggesting a possible biochemical link.

Conclusions:

  • Migraine attacks are conceived to originate in the brain, initiated by triggers that cause a spreading depression-like event.
  • Genetic factors influencing cell membrane excitability likely play a role in an individual's susceptibility to migraine.
  • The interplay between genetic predisposition, neuronal excitability, and external triggers determines the threshold for migraine attacks.

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