Abstract
Photosensitization includes events triggered within the skin by the interaction of a chromophore (photosensitizer) and light. It may be apparent as an inflammatory reaction depending on UV light dose and chromophore concentration in the skin (phototoxicity) or as a specific immune reaction requiring a primary sensitization phase (photoallergy).
An in vivo testing could be necessary to identify the compound involved in a patient affected by an adverse reaction to the sun or to evaluate the photosensitizing potential of a drug. Photosensitization tests combine compound introducing into the skin and further skin irradiation using an artificial light source.
They are of three types: photopatch tests, photointradermal test, and systemic phototests. In photopatch tests, the compound is applied on the skin which eventually has been previously treated in order to increase penetration (abrasion of the horny layer or scarification). In photointradermal and photoprick test, the compound is intradermally injected in order to bypass the skin barrier. A prior measurement of the minimal erythema dose in UVB and UVA is necessary to help select the appropriate UV light doses.
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Beani, JC. (2016). Phototoxicity, Photoirritation, and Photoallergy Detection and Assessment. In: Humbert, P., Maibach, H., Fanian, F., Agache, P. (eds) Agache’s Measuring the Skin. Springer, Cham. https://doi.org/10.1007/978-3-319-26594-0_137-1
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DOI: https://doi.org/10.1007/978-3-319-26594-0_137-1
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