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IL-10 Contributes to the Inhibition of Contact Hypersensitivity in Mice Treated with Photodynamic Therapy

Guillermo O. Simkin^1,*, Jing-Song Tao^*, Julia G. Levy^*, and David W. C. Hunt^*,

^* QLT PhotoTherapeutics Inc., Vancouver, BC, Canada; Department of Microbiology and Immunology, Faculty of Science, University of British Columbia, Vancouver, BC, Canada; and Department of Pathology and Laboratory Medicine, St. Paul’s Hospital-University of British Columbia, Vancouver, BC, Canada

We have explored the effect of photodynamic therapy (PDT) with verteporfin on the induction and expression of contact hypersensitivity (CHS) to 2,4-dinitrofluorobenzene (DNFB) in normal mice and IL-10-deficient mice. Our results indicate that DNFB sensitized mice given PDT with verteporfin and whole body red light irradiation exhibited a significant reduction in CHS compared with control animals. Administration of rIL-12 reversed the effect(s) of PDT as did treatment of mice with anti-IL-10-neutralizing Ab. Knockout mice deficient in IL-10 were found to be resistant to the inhibitory effects of PDT. In vitro proliferative responses using spleen cells from DNFB-sensitized and PDT-treated mice showed a significantly lower response to DNBS as compared with cells from DNFB-sensitized mice or DNFB and PDT-treated IL-10-deficient mice. Finally, naive mice exposed to PDT exhibited an increase in skin IL-10 levels, which peaked between 72 and 120 h post-PDT. Together these data support the role of IL-10 as a key modulator in the inhibition of the CHS response by whole body PDT.

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