Abstract
Urocanic acid (UCA) is one of the most efficient ultraviolet (UV) radiation-absorbing substances of the skin. UV irradiation leads to the interconversion of the two stereoisomers trans-UCA and cis-UCA, of which the latter is able to induce immunosuppression. Accordingly, the regulation of UCA biosynthesis, UV absorption by UCA in the cornified layer of the epidermis and the effects of UCA on the adaptive immune system are integral components of the cutaneous UV stress program. Here the evidence for the multiple roles of UCA in the skin and the associated open scientific questions are reviewed comprehensively.
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Eckhart, L. (2016). Urocanic Acid and Skin Photodamage: New Light on an Old Chromophore. In: Wondrak, G. (eds) Skin Stress Response Pathways. Springer, Cham. https://doi.org/10.1007/978-3-319-43157-4_4
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