title: Increased plasma substance P and CGRP levels, and high ACE activity in migraineurs during headache-free periods.
abstract: Substance P (SP), calcitonin gene-related peptide (CGRP), and angiotensin converting enzyme (ACE) may have roles in trigeminovascular nociceptive mechanisms. We investigated interictal levels of SP, CGRP, ACE activity, and their correlation, in a sample of migraineurs. Forty-one patients suffering from migraine with aura (MA), 54 without aura (MO), and 52 non-headache subjects (controls) participated in this study. Blood samples were collected from cubital veins. Plasma levels of SP and CGRP were measured by enzyme immunoassay. Plasma ACE activities were measured spectrophotometrically. SP levels in MA (6.6+/-3.7 pg/ml; mean+/-SD) and MO (6.6+/-3.2 pg/ml) were significantly higher than in controls (4.8+/-2.4 pg/ml) (P<0.01). CGRP levels in MA (18.8+/-8.8 pg/ml) and MO (19.1+/-9.4 pg/ml) were also significantly higher than in controls (13.4+/-4.4 pg/ml) (P<0.01). ACE activities in MA (34.6+/-19.0 U/l) were significantly higher than in MO (25.3+/-13.2 U/l) and controls (27.0+/-20.4 U/l) (P<0.05). There was a significant correlation between SP and CGRP levels (P<0.05). In MA, SP and CGRP showed a tendency toward positive correlation, which was not significant. There was a weak, but significant positive correlation between SP levels and ACE activities (P<0.01). However, a relationship between ACE activities and CGRP levels was not observed. The data suggest that SP, CGRP, and ACE are relevant to migraine pathophysiology, and that they may interact.
authors.affiliation: Department of Neurology, Institute of Neurological Sciences, Faculty of Medicine, Tottori University, 36-1 Nishi-cho, Yonago 683-8504, Japan.
authors.forename: Emi
authors.initials: E
authors.lastname: Fusayasu
authors.forename: Hisanori
authors.initials: H
authors.lastname: Kowa
authors.forename: Takao
authors.initials: T
authors.lastname: Takeshima
authors.forename: Kazuhiro
authors.initials: K
authors.lastname: Nakaso
authors.forename: Kenji
authors.initials: K
authors.lastname: Nakashima
mesh_terms: D000328:Adult; D015415:Biomarkers / Q000097:blood; D015740:Calcitonin Gene-Related Peptide / Q000097:blood*; D005260:Female; D006801:Humans; D008297:Male; D008881:Migraine Disorders / Q000097:blood* / Q000175:diagnosis*; D007703:Peptidyl-Dipeptidase A / Q000097:blood*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013223:Statistics as Topic; D013373:Substance P / Q000097:blood*
chemical_list: D015415:Biomarkers; D013373:Substance P; D007703:Peptidyl-Dipeptidase A; D015740:Calcitonin Gene-Related Peptide