Abstract
Natural sunlight has beneficial effects for various skin conditions and immunoregulatory functions. Phototherapy utilizes the beneficial effects and immunoregulatory functions of natural sunlight. Phototherapy is used for refractory skin disease when topical steroid treatment is not effective. Ultraviolet light (UV) phototherapy using broadband UVB (290–320 nm) and narrowband UVA (311–313 nm) is a well-established treatment for refractory skin disease, such as psoriasis. UV phototherapy has two primary modes of action: apoptosis induction and immune suppression. Narrowband UVB depletes pathogenic T cells by inducing apoptosis and induces regulatory T cells. UVB, psoralen and UVA, and UVA-1 (340–400 nm) are useful treatments of refractory skin diseases, and can be used in conjunction with topical steroids. Selective wavelength phototherapies are used to minimize the carcinogenic risks of UV exposure. UVA-1 effectively penetrates the dermal layers, and is thus superior to UVB, which is mainly absorbed by the epidermis. UVA-1 induces both early and late apoptosis, whereas UVB induces only late apoptosis, making UVA-1 phototherapy particularly effective for treating pathogenically relevant cells, leading to immediate and long-lasting remission. Excimer light (308 nm) therapy effectively targets affected skin without undue exposure of other areas and increases the levels of T regulatory cells. Fewer treatments and a lower cumulative UVB dose are other advantages of excimer light; the greater carcinogenic risk is ameliorated by the reduced number of treatments needed. Intensive studies of phototherapy effects have led to several improvements in the design and protocols, providing several options to patients with skin disease.
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Morita, A. (2016). Photodermatology: Therapeutic Photomedicine for Skin Diseases. In: Kabashima, K. (eds) Immunology of the Skin. Springer, Tokyo. https://doi.org/10.1007/978-4-431-55855-2_30
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DOI: https://doi.org/10.1007/978-4-431-55855-2_30
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