title: Angiotensin converting enzyme has an inhibitory role in CGRP metabolism in human skin.
abstract: The neutral endopeptidase (NEP) is important for calcitonin gene related peptide (CGRP) degradation, while the role of angiotensin converting enzyme (ACE) remains unclear. By using dermal microdialysis we explored the effect of phosphoramidon (NEP blocker), captopril (ACE blocker) and a mixture of both drugs on the intensity of electrically-induced CGRP-mediated neurogenic flare. The results reveal that phosphoramidon elevated flare intensity, but that this was not further increased by adding captopril. In contrast, neurogenic flare was decreased when the drug mixture was applied in compared to NEP only. Electrically released CGRP levels could be measured directly in perfusates containing phosphoramidon and the mixture. Again, CGRP levels were elevated in phosphoramidon treated sites, and significantly reduced upon adding captopril. These findings suggest that NEP and ACE do not have additive effects regarding neuropeptide degradation. In contrast, inhibition of ACE seems to augment CGRP catabolism.
authors.affiliation: Department of Neurology, Johannes Gutenberg-University, Langenbeckstr. 1, 55101 Mainz, Germany. kraemer@neurologie.klinik.uni-mainz.de
authors.forename: Heidrun H
authors.initials: HH
authors.lastname: Krämer
authors.forename: Katharina
authors.initials: K
authors.lastname: Schmidt
authors.forename: Stefan
authors.initials: S
authors.lastname: Leis
authors.forename: Martin
authors.initials: M
authors.lastname: Schmelz
authors.forename: Claudia
authors.initials: C
authors.lastname: Sommer
authors.forename: Frank
authors.initials: F
authors.lastname: Birklein
mesh_terms: D000328:Adult; D000806:Angiotensin-Converting Enzyme Inhibitors / Q000494:pharmacology; D015740:Calcitonin Gene-Related Peptide / Q000037:antagonists & inhibitors* / Q000378:metabolism*; D002216:Captopril / Q000494:pharmacology; D005260:Female; D006020:Glycopeptides / Q000494:pharmacology; D006801:Humans; D017078:Laser-Doppler Flowmetry; D008297:Male; D007703:Peptidyl-Dipeptidase A / Q000378:metabolism*; D012183:Retrograde Degeneration; D012867:Skin / Q000378:metabolism*; D014664:Vasodilation / Q000187:drug effects
chemical_list: D000806:Angiotensin-Converting Enzyme Inhibitors; D006020:Glycopeptides; D002216:Captopril; D007703:Peptidyl-Dipeptidase A; D015740:Calcitonin Gene-Related Peptide; C008890:phosphoramidon