Interaction of calcitonin gene related peptide (CGRP) and substance P (SP) in human skin.

Published on Oct 1, 2016in Neuropeptides2.411
· DOI :10.1016/J.NPEP.2016.06.001
Tanja Schlereth23
Estimated H-index: 23
(University of Mainz),
Jonas Schukraft1
Estimated H-index: 1
(University of Mainz)
+ 3 AuthorsFrank Birklein71
Estimated H-index: 71
(University of Mainz)
Sources
Abstract
Abstract Calcitonin gene related peptide (CGRP) and substance P (SP) are neuropeptides that are simultaneously released from nociceptive C-fibers. CGRP is a potent vasodilator, inducing a long-lasting increase in superficial skin blood flow, whereas SP induces only a brief vasodilation but a significant plasma extravasation. CGRP and SP may play important roles in the pathophysiology of various pain states but little is known about their interaction. Different concentrations of SP (ranging from 10 − 5  M to 10 − 9  M) were applied to the volar forearm of 24 healthy subjects via dermal microdialysis. SP was applied either alone or in combination with CGRP10 − 9  M and CGRP 10 − 6  M. As expected, SP induced a transient increase in skin blood flow that decayed shortly after application. This transient blood flow peak was blunted with co-application of CGRP 10 − 9  M and inhibited with co-application of CGRP10 − 6  M. SP alone induced plasma protein extravasation (PPE). However, when CGRP10 − 6  M was added, the PPE significantly increased. Our results demonstrate a complex interaction of the neuropeptides CGRP and SP. CGRP10 − 6  M prevented SP-induced early vasodilation but augmented SP-induced PPE. These interactions might explain why vascular symptoms in chronic pain can differ strikingly between individuals.
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