title: Calcitonin gene-related peptide triggers migraine-like attacks in patients with migraine with aura.
abstract: BACKGROUND
  Calcitonin gene-related peptide (CGRP) is a key molecule in migraine pathogenesis. Intravenous CGRP infusion triggers delayed migraine-like attacks in patients with migraine without aura (MO). In contrast to patients with MO, in prior studies patients with familial hemiplegic migraine (FHM) did not report more migraine-like attacks compared to controls. Whether CGRP triggers migraine in patients with typical (non-hemiplegic) migraine with aura is (MA) unknown. In the present study we examined the migraine inducing effect of CGRP infusion in patients suffering from MA and healthy controls.
  
  
  METHODS
  Fourteen patients suffering exclusively from migraine with typical aura (MA) and 11 healthy volunteers received a continuous intravenous infusion of 1.5 µg/min CGRP over 20 minutes. Headache and other migraine symptoms were scored every 10 minutes for one hour and self recorded hourly thereafter and until 13 hours post-infusion.
  
  
  RESULTS
  CGRP infusion induced significantly more delayed headaches in MA patients (12 out of 14) than in controls (2 out of 11) (p = 0.001). Furthermore, significantly more MA patients (57%; 8 out of 14) fulfilled criteria for an experimentally induced migraine attack after CGRP than controls (0%; 0 out of 11) (P = 0.003). Four patients (28%) reported aura symptoms after CGRP infusion.
  
  
  CONCLUSIONS
  CGRP triggered migraine-like attacks without aura in patients suffering exclusively from MA. It also triggered a typical aura in 28% of the patients. These data indicate similar neurobiological pathways responsible for triggering migraine headache in MA and MO patients, and suggest differences between MA/MO and FHM.
authors.affiliation: Glostrup Hospital and University of Copenhagen, Denmark.
authors.forename: Jakob Møller
authors.initials: JM
authors.lastname: Hansen
authors.forename: Anne Werner
authors.initials: AW
authors.lastname: Hauge
authors.forename: Jes
authors.initials: J
authors.lastname: Olesen
authors.forename: Messoud
authors.initials: M
authors.lastname: Ashina
mesh_terms: D000328:Adult; D019540:Area Under Curve; D015740:Calcitonin Gene-Related Peptide / Q000009:adverse effects / Q000378:metabolism*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D020325:Migraine with Aura / Q000139:chemically induced* / Q000503:physiopathology*
chemical_list: D015740:Calcitonin Gene-Related Peptide