title: CGRP may play a causative role in migraine.
abstract: Calcitonin gene-related peptide (CGRP) has been detected in increased amounts in external jugular venous blood during migraine attacks. However, it is unknown whether this is secondary to migraine or whether CGRP may cause headache. In a double-blind crossover study, the effect of human alphaCGRP (2 microg/min) or placebo infused intravenously for 20 min was studied in 12 patients suffering from migraine without aura. Headache intensity was scored on a scale from 0 to 10. Two patients were excluded due to severe hypotension and one because she had an infection. In the first hour median peak headache score was 1.0 in the halphaCGRP group vs. 0 in the placebo group (P < 0.01). During the following 11 h all patients experienced headaches after halphaCGRP vs. one patient after placebo (P = 0.0004). The median maximal headache score was 4 after CGRP and 0 after placebo (P = 0.006). In three patients after halphaCGRP, but in no patients after placebo, the delayed headache fulfilled the IHS criteria for migraine without aura. As intravenous administration of halphaCGRP causes headache and migraine in migraineurs, our study suggests that the increase in CGRP observed during spontaneous migraine attacks may play a causative role.
authors: Department of Neurology, Glostrup Hospital, University of Copenhagen, Denmark. l.h.lassen@dadlnet.dk
authors: L H
authors: LH
authors: Lassen
authors: P A
authors: PA
authors: Haderslev
authors: V B
authors: VB
authors: Jacobsen
authors: H K
authors: HK
authors: Iversen
authors: B
authors: B
authors: Sperling
authors: J
authors: J
authors: Olesen
mesh_terms: D000328:Adult; D001783:Blood Flow Velocity / Q000187:drug effects; D001921:Brain / Q000098:blood supply; D015740:Calcitonin Gene-Related Peptide / Q000494:pharmacology / Q000502:physiology*; D004311:Double-Blind Method; D005260:Female; D006801:Humans; D007262:Infusions, Intravenous; D008297:Male; D008875:Middle Aged; D020768:Middle Cerebral Artery / Q000000981:diagnostic imaging / Q000187:drug effects; D008881:Migraine Disorders / Q000139:chemically induced / Q000175:diagnosis / Q000503:physiopathology*; D012016:Reference Values; D012039:Regional Blood Flow / Q000187:drug effects; D015899:Tomography, Emission-Computed, Single-Photon; D017585:Ultrasonography, Doppler, Transcranial; D014653:Vascular Headaches / Q000139:chemically induced / Q000175:diagnosis / Q000503:physiopathology
chemical_list: D015740:Calcitonin Gene-Related Peptide