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LTA4 hydrolase in human skin: decreased activity, but normal concentration in lesional psoriatic skin

Evidence for different LTA4 hydrolase activity in human lymphocytes and human skin

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Abstract

Leukotriene A4 (LTA4) hydrolase which transforms LTA4 into the proinflammatory compound LTB4 has been identified in human epidermis. The purpose of this study was to investigate the potential role of this enzyme in psoriasis, in which LTB4 is present in biologically active concentrations. The concentration and activity of LTA4 hydrolase was determined in normal skin and in matched samples of involved and uninvolved psoriatic skin. The enzyme content was determined using an affinity-purified antibody. This antibody was also used for immunohistochemical staining of skin biopsies. Immunohistochemically LTA4 hydrolase was localized predominantly in the basal and spinous layers in normal skin and in involved and uninvolved psoriatic skin. The LTA4 hydrolase content varied between 2.8 and 3.1 μg enzyme/mg protein and was found to be similar in normal and psoriatic skin, involved as well as uninvolved. In contrast, the activity of the enzyme was decreased significantly in involved psoriatic skin (9.9±2.1 μg LTB4/mg enzyme per min) compared with matched uninvolved psoriatic skin (16.4±3.5 μg LTB4/mg enzyme per min), but was decreased only insignificantly compared with normal skin (12.4±1.8 μg LTB4/mg enzyme per min). It was found that the conversion of LTA4 to LTB4 results in inactivation of LTA4 hydrolase activity. This finding is compatible with the idea that the decreased LTA4 hydrolase activity in involved psoriatic skin reflects transcellular LTB4 formation in vivo. In peripheral lymphocytes the enzyme content was 1.3±0.3 μg enzyme/mg protein in normal lymphocytes and 1.4±0.3 μg enzyme/mg protein in psoriatic lymphocytes, which was significantly lower than in the skin. In contrast, the specific LTA4 hydrolase activities in normal and psoriatic lymphocytes (23.4±1.3 and 21.3±1.7 μg LTB4/mg enzyme per min) were significantly higher than in normal skin. These findings may indicate the existence of LTA4 hydrolase isoforms in human lymphocytes and human skin.

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Authors and Affiliations

  1. Department of Dermatology, Marselisborg Hospital, University of Aarhus, DK-8000, Aarhus C, Denmark

    Lars Iversen & Knud Kragballe

  2. Department of Rheumatology, Aarhus Kommunehospital, University of Aarhus, Aarhus, Denmark

    Bent Deleuran

  3. Department of Chemistry, University of Odense, Odense, Denmark

    Anne Mette Hoberg

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  1. Lars Iversen
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  2. Bent Deleuran
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  4. Knud Kragballe
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Iversen, L., Deleuran, B., Hoberg, A.M. et al. LTA4 hydrolase in human skin: decreased activity, but normal concentration in lesional psoriatic skin. Arch Dermatol Res 288, 217–224 (1996). https://doi.org/10.1007/BF02530088

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