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Urocanic acid suppresses the activation of human neutrophils in vitro

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Abstract

Exposure to ultraviolet (UV) light impairs the function of inflammatory cells. Urocanic acid (UCA) in an stratum corneum has been suggested as a mediator in the immunosuppression of lymphoid cells detected after irradiation with UVB (UV wavelengths 280–320 nm). In this study, we examined the effects of the two UCA isomers,trans andcis UCA on human polymorphonuclear leukocytes, neutrophils. It was found that treatment of cells with eithertrans ofcis UCA isomers inhibited the opsonized zymosan-induced respiratory burst activity, measured with luminolenhanced chemiluminescence assay. Both isomers were also able to partially block the up-regulation of complement receptors 1 (CR1; CD35) and 3 (CR3; CD11b/CD18) in N-formyl-methionyl-leucyl-phenylalanine (FMLP)-stimulated neutrophils. These results indicate that the isomerization oftrans UCA toeis UCA is not essential for the action of UCA on neutrophils. Neither of the UCA isomers were found to induce cyclic AMP (cAMP) formation in 3-isobutyl-1-methylxanthine treated cells, suggesting that the activation of adenylate cyclase-cAMP system is not involved in UCA provoked suppression of neutrophils. It is concluded that the function of UCA may be protective, to suppress the activation of human neutrophils in inflamed, sunburned epidermis.

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Authors and Affiliations

  1. Department of Clinical Chemistry, Turku University Central Hospital, FIN-20520, Turku, Finland

    K. Kivistö, K. Punnonen & L. Leino

  2. Department of Dermatology, Turku University Central Hospital, FIN-20520, Turku, Finland

    K. Kivistö

  3. Department of Pediatrics, Turku University Central Hospital, FIN-20520, Turku, Finland

    J. Toppari

Authors
  1. K. Kivistö
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  2. K. Punnonen
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  3. J. Toppari
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  4. L. Leino
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Kivistö, K., Punnonen, K., Toppari, J. et al. Urocanic acid suppresses the activation of human neutrophils in vitro. Inflammation 20, 451–459 (1996). https://doi.org/10.1007/BF01487038

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