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- W1984312827 abstract "Irradiation of skin by sunlight or ultraviolet B (UVB, 290–320 nm) brings about a downregulation of cell-mediated immunity. An action spectrum for photoimmune suppression in mice indicates that trans-urocanic acid absorbs UV photons and is isomerized to the cis-isomer in the stratum corneum. Cis-urocanic acid is subsequently shown to suppress cellular immunity in mice. When histidine is elevated in a mouse diet, a higher level of urocanic acid is detected in mouse skin. These mice are more susceptible to photoimmune suppression. There is evidence that humans and animals experiencing protein malnutrition have very high levels of urocanic acid and/or histidine. Urocanic acid is formed by deamination of histidine in one enzymatic step. We discuss the protein malnutrition of kwashiorkor patients. They experience suppressed immunity and disturbed histidine metabolism. Here, we present a testable hypothesis: one cause of the immune deficiency observed in humans with protein malnutrition is the photoconversion by UVB of increased levels of trans-urocanic acid in skin to cis-urocanic acid, which suppresses the cellular immune system." @default.
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- W1984312827 date "1998-07-01" @default.
- W1984312827 modified "2023-10-18" @default.
- W1984312827 title "The potential role for urocanic acid and sunlight in the immune suppression associated with protein malnutrition" @default.
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- W1984312827 doi "https://doi.org/10.1016/s1011-1344(98)00130-4" @default.
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