title: Calcitonin gene-related peptide does not cause the familial hemiplegic migraine phenotype.
abstract: OBJECTIVE
  The neuropeptide calcitonin gene-related peptide (CGRP) is a migraine trigger that plays a crucial role in migraine pathophysiology, and CGRP antagonism is efficient in the treatment of migraine attacks. Familial hemiplegic migraine (FHM) is a dominantly inherited subtype of migraine with aura associated with several gene mutations. FHM shares many phenotypical similarities with common types of migraine, indicating common neurobiological pathways. We tested the hypothesis that the FHM genotype confers a CGRP hypersensitive phenotype.
  
  
  METHODS
  We included 9 FHM patients with known mutations in the CACNA1A and ATP1A2 genes and 10 healthy controls. All subjects received i.v. infusion of CGRP (1.5 microg/min). We recorded headache intensity on a verbal rating scale and vascular changes in the middle cerebral artery and the superficial temporal artery.
  
  
  RESULTS
  CGRP infusion did not induce an aura in any of the participants. The incidences of reported migraine and migraine-like headache were not different in the two groups, with 22% (2 of 9) reporting migraine in the patient group and 10% (1 of 10) reporting migraine-like headache in the control group (95% CI -0.31 to 0.55; p = 0.58). Headache severity and intensity were not different between the groups.
  
  
  CONCLUSIONS
  Familial hemiplegic migraine (FHM) patients do not show hypersensitivity of the calcitonin gene-related peptide (CGRP)-cyclic adenosine 3',5'-monophosphate pathway, as characteristically seen in migraine patients without aura. This indicates that the pathophysiologic pathways underlying migraine headache in FHM may be different from the common types of migraine and questions whether CGRP antagonists would be effective in the treatment of FHM patients.
authors.affiliation: Danish Headache Center and Department of Neurology, Glostrup Hospital, Faculty of Health Sciences, University of Copenhagen, Nordre Ringvej 57, Bolig 23-24, DK-2600 Glostrup, Copenhagen, Denmark. jmh@dadlnet.dk
authors.forename: Jakob Møller
authors.initials: JM
authors.lastname: Hansen
authors.forename: Lise Lykke
authors.initials: LL
authors.lastname: Thomsen
authors.forename: Jes
authors.initials: J
authors.lastname: Olesen
authors.forename: Messoud
authors.initials: M
authors.lastname: Ashina
mesh_terms: D000328:Adult; D001783:Blood Flow Velocity / Q000235:genetics; D015740:Calcitonin Gene-Related Peptide / Q000008:administration & dosage / Q000502:physiology*; D000242:Cyclic AMP / Q000235:genetics / Q000502:physiology; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D020325:Migraine with Aura / Q000209:etiology / Q000378:metabolism* / Q000503:physiopathology; D009154:Mutation / Q000235:genetics; D010641:Phenotype; D015398:Signal Transduction / Q000235:genetics; D016037:Single-Blind Method
chemical_list: D000242:Cyclic AMP; D015740:Calcitonin Gene-Related Peptide