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In situ expression of messenger RNA of interleukin-1 and interleukin-6 in psoriasis: interleukin-6 involved in formation of psoriatic lesions

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Summary

Psoriasis is a disease of abnormal proliferation and differentiation of epidermal cells. Several cytokines released by keratinocytes are implicated as factors responsible for this pathological condition of the epidermis. In order to elucidate the role of these cytokines in psoriasis, messenger RNA (mRNA) expression of interleukin-1 (IL-1) and IL-6 in psoriatic epidermis was investigated using biotin-labelled complementary DNA (cDNA) of the cytokines. Messenger RNA of IL-1α was weakly detected in some normal healthy epidermis specimens and more strongly in all the perilesional uninvolved psoriatic epidermis specimens. It was also expressed in the transitional zone between uninvolved and fully developed psoriatic skin, but was not expressed in lesional skin. In contrast, IL-6 mRNA was rarely expressed in normal healthy epidermis, but was expressed in perilesional uninvolved psoriatic epidermis, in the transitional zone and in the fully developed lesional epidermis, with the maximum intensity in the transitional zone. Expression of mRNA of IL-6 receptor showed a similar tendency to that of IL-6. It was expressed in psoriatic epidermis, most strongly in the transitional zone, but not in normal healthy epidermis. IL-6 was demonstrated immunohistochemically in psoriatic epidermis, but IL-6 receptor was demonstrated only in the transitional zone. Thus IL-6 and its receptor expression correlated well with the formation of psoriatic lesions where IL-1 may initiate their expression. IL-6 may play an important role in the pathogenesis of psoriasis.

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Authors and Affiliations

  1. Department of Dermatology, Kitasato University School of Medicine, Sagamihara, Japan

    Y. Ohta, I. Katayama, T. Funato, H. Yokozeki, S. Nishiyama & K. Nishioka

  2. Division of Immunology, Institute for Molecular and Cellular Biology, Osaka University, Osaka, Japan

    T. Hirano & T. Kishimoto

Authors
  1. Y. Ohta
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  2. I. Katayama
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  3. T. Funato
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  4. H. Yokozeki
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  5. S. Nishiyama
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  6. T. Hirano
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  7. T. Kishimoto
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  8. K. Nishioka
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Ohta, Y., Katayama, I., Funato, T. et al. In situ expression of messenger RNA of interleukin-1 and interleukin-6 in psoriasis: interleukin-6 involved in formation of psoriatic lesions. Arch Dermatol Res 283, 351–356 (1991). https://doi.org/10.1007/BF00371814

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  • DOI: https://doi.org/10.1007/BF00371814

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