Calcitonin gene-related peptide is necessary for ultraviolet B-impaired induction of contact hypersensitivity
- PMID: 9548453
Calcitonin gene-related peptide is necessary for ultraviolet B-impaired induction of contact hypersensitivity
Abstract
Since nerve termini on Langerhans cells (LC) contain calcitonin gene-related peptide (CGRP), and since ultraviolet B radiation (UVR) causes CGRP to be released from cutaneous nerve endings, we examined whether CGRP participates in the immune aberrations caused in skin by UVR. First, intradermally injected CGRP, in a dose-dependent manner, reduced LC density and impaired CH induction when hapten was painted on the injected site. Second, CGRP antagonist restored CH induction after UVR. Third, anti-TNF-alpha Abs injected before CGRP prevented the loss of LC density and restored CH induction. Fourth, CGRP failed to impair CH induction in mast cell-deficient mice. Fifth, CGRP induced mast cells to release TNF-alpha. We conclude that CGRP plays an essential role in the loss of CH induction after UVR. These data indicate that UVR, by causing the release of CGRP from cutaneous nerve endings, triggers mast cell release of TNF-alpha, which impairs CH induction.
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