UVB Radiation-mediated Inhibition of Contact Hypersensitivity Reactions is Dependent on the Platelet-activating Factor System

Overview

Journal J Invest Dermatol

Publisher Elsevier

Specialty Dermatology

Date 2008 Jan 18

PMID 18200048

Citations 44

Authors

Qiwei Zhang

Yongxue Yao

Raymond L Konger

Anthony L Sinn

Shanbao Cai

Karen E Pollok

Jeffrey B Travers

Affiliations

Soon will be listed here.

Abstract

Through its ability to both induce immunosuppression and act as a carcinogen, UVB radiation plays a major role in cutaneous malignancies. Recent studies have indicated that UVB-mediated inhibition of delayed-type hypersensitivity reactions is mediated, in part, by the lipid mediator platelet-activating factor (PAF). The objective of this study was to further define the mechanism by which UVB inhibits contact hypersensitivity (CHS) reactions. UVB irradiation resulted in an inhibition of subsequent CHS to the chemical DNFB in wild-type, but not in PAF-R-deficient mice. UVB-mediated inhibition of CHS was also blocked by a cyclooxygenase-2 (COX-2) inhibitor or a neutralizing antibody directed against IL-10. UVB irradiation upregulated IL-10 mRNA levels in lymph nodes and spleen only to significant levels in PAF-R-expressing mice. Bone marrow transplantation studies demonstrated that UVB-mediated immunomodulatory effects were dependent on PAF-R-positive bone marrow. These studies suggest that UVB irradiation results in epidermal production of PAF agonists, which then act on PAF-R-positive bone marrow-derived cells to upregulate IL-10 through COX-2-generated prostaglandins.

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