Abstract
The ultraviolet (UV) radiation contained in sunlight is a powerful immune suppressant. While exposure to UV is best known for its ability to cause skin cancer, it is also associated with protection against a range of autoimmune diseases, particularly multiple sclerosis (MS). Although the precise mechanism by which sunlight affords protection from MS remains to be determined, some have hypothesised that UV immunosuppression explains the “latitude-gradient effect” associated with MS. By stimulating the release of soluble factors in exposed skin, UV activates immune suppressive pathways that culminate in the induction of regulatory cells in distant tissues. Each and every one of the immune suppressive cells and molecules activated by UV exposure are potential targets for treating and preventing MS. A thorough understanding of the mechanisms involved is therefore required if we are to realise the therapeutic potential of photoimmunology.
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Marsh-Wakefield, F., Byrne, S.N. (2015). Photoimmunology and Multiple Sclerosis. In: La Flamme, A., Orian, J. (eds) Emerging and Evolving Topics in Multiple Sclerosis Pathogenesis and Treatments. Current Topics in Behavioral Neurosciences, vol 26. Springer, Cham. https://doi.org/10.1007/7854_2014_359
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