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• W2100081779 abstract "Exposure to UV radiation induces skin cancer and suppresses the immune response. To induce immune suppression, the electromagnetic energy of UV radiation must be absorbed by an epidermal photoreceptor and converted into a biologically recognizable signal. Two photoreceptors have been recognized: DNA and trans -urocanic acid (UCA). Trans -UCA is normally found in the outermost layer of skin and isomerizes to the cis isomer upon exposure to UV radiation. Although UCA was identified as a UV photoreceptor years ago, and many have documented its ability to induce immune suppression, its exact mode of action remains elusive. Particularly vexing has been the identity of the molecular pathway by which cis -UCA mediates immune suppression. Here we provide evidence that cis -UCA binds to the serotonin [5-hydroxytryptamine (5-HT)] receptor with relatively high affinity ( K d = 4.6 nM). Anti- cis -UCA antibody precipitates radiolabeled 5-HT, and the binding is inhibited by excess 5-HT and/or excess cis -UCA. Similarly, anti-5-HT antibody precipitates radiolabeled cis -UCA, and the binding is inhibited by excess 5-HT or excess cis -UCA. Calcium mobilization was activated when a mouse fibroblast line, stably transfected with the human 5-HT 2A receptor, was treated with cis -UCA. Cis -UCA-induced calcium mobilization was blocked with a selective 5-HT 2A receptor antagonist. UV- and cis -UCA-induced immune suppression was blocked by antiserotonin antibodies or by treating the mice with 5-HT 2A receptor antagonists. Our findings identify cis -UCA as a serotonin receptor ligand and indicate that the immunosuppressive effects of cis -UCA and UV radiation are mediated by activation of the 5-HT 2A receptor." @default.
• W2100081779 created "2016-06-24" @default.
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• W2100081779 date "2006-11-14" @default.
• W2100081779 modified "2023-10-16" @default.
• W2100081779 title "<i>Cis</i>-urocanic acid, a sunlight-induced immunosuppressive factor, activates immune suppression via the 5-HT_2Areceptor" @default.
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• W2100081779 doi "https://doi.org/10.1073/pnas.0603119103" @default.
• W2100081779 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/1859944" @default.
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