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Proliferation and interferon-γ receptor expression in psoriatic and healthy keratinocytes are influenced by interactions between keratinocytes and fibroblasts in a skin equivalent model

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Abstract

Epidermal-dermal interactions were studied in a skin equivalent model. Six combinations of keratinocytes and fibroblasts from healthy and psoriatic skin were used. TPA (12-O-tetradecanoylphorbol-13-acetate) was used to determine whether the expression of the IFN-γ receptors in keratinocytes was related to epidermal differentiation and proliferation. These phenomena were assessed by immunohistochemistry. In all epidermal outgrowths, the epidermal growth factor receptor was expressed throughout the epidermis, cytokeratin 16 suprabasally, and filaggrin and involucrin in its superficial part. The IFN-γ receptor was expressed throughout the epidermis, but was unevenly distributed. The expression of the IFN-γ receptor was quantified by confocal laser scanning microscopy both in the whole of epidermis and in areas with the strongest intensity. The total amount varied to a minor degree in the epidermal outgrowths of different origins and was unaffected by TPA. In high-intensity areas interactions between keratinocytes and fibroblasts did influence the amount of IFN-γ receptor expression and TPA decreased the expression by 13%. There was no correlation between the proliferation rate and the expression of the IFN-γ receptor. Psoriatic and healthy keratinocytes were equally well differentiated in the skin equivalents. The interferon-γ receptor was similarly expressed under these conditions. The growth rate, assessed by Ki-67-positive nuclei in the basal layer, was highest in healthy keratinocytes. Keratinocytes from psoriatic lesions increased their growth rate when cocultured with psoriatic fibroblasts compared with normal ones, indicating that fibroblasts may be of importance for epidermal hyperproliferation in psoriatic lesions.

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Authors and Affiliations

  1. Department of Dermatology, Karolinska Hospital, S-171 76, Stockholm, Sweden

    Jessica Fransson & Hans Hammar

  2. Department of Clinical Immunology, Karolinska Hospital, Stockholm, Sweden

    Axel Emilson & Annika Scheynius

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  1. Jessica Fransson
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  2. Hans Hammar
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  3. Axel Emilson
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  4. Annika Scheynius
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Fransson, J., Hammar, H., Emilson, A. et al. Proliferation and interferon-γ receptor expression in psoriatic and healthy keratinocytes are influenced by interactions between keratinocytes and fibroblasts in a skin equivalent model. Arch Dermatol Res 287, 517–523 (1995). https://doi.org/10.1007/BF00374069

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  • DOI: https://doi.org/10.1007/BF00374069

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