Calcitonin gene-related peptide, substance P and nitric oxide are involved in cutaneous inflammation following ultraviolet irradiation

European Journal of Pharmacology
J BenrathF Gillardon

Abstract

Evidence from our previous work suggests that neurogenic mediators contribute to the inflammation following ultraviolet (UV) irradiation of the skin. We have investigated whether calcitonin gene-related peptide (CGRP), substance P and nitric oxide (NO) participate in the cutaneous inflammatory reaction of the rat hind paw and ear to UV irradiation. Skin blood flow was measured by laser Doppler technique. Oedema was quantified using a spring loaded micrometer to measure ear thickness. UV irradiation of the rat skin lead to a long lasting increase in skin blood flow. This increase was dose dependently attenuated by the CGRP receptor antagonist CGRP-(8-37) (0.15 nmol in 25 microliters to 6.0 nmol in 25 microliters, s.c.) up to 51% with a maximum of effectiveness at 24 h post irradiation. The inhibitor of NO synthase NG-nitro-L-arginine methyl ester hydrochloride (L-NAME, 25 nmol in 25 microliters, s.c.) attenuated skin blood flow by 38%. Concurrent injections s.c. of CGRP-(8-37) (1.5 nmol in 12.5 microliters) and L-NAME (25 nmol in 12.5 microliters) demonstrated an augmentive effect in attenuating skin blood flow. The tachykinin NK1 receptor antagonist CP-96,345 (6.0 nmol in 25 microliters, s.c.) attenuated skin blood flow by 27%....Continue Reading

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