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Increased expression of epidermal IL-8 receptor in psoriasis. Down-regulation by FK-506 in vitro.

B S Schulz, G Michel, S Wagner, R Süss, A Beetz, R U Peter, L Kemény and T Ruzicka
J Immunol October 15, 1993, 151 (8) 4399-4406;
B S Schulz
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G Michel
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S Wagner
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R Süss
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A Beetz
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R U Peter
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L Kemény
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T Ruzicka
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Abstract

IL-8 is a chemotactic cytokine with proinflammatory and growth-promoting activities. Recently it has been shown to influence several functions of keratinocytes, including HLA-DR expression, chemotaxis, and proliferation by binding to a specific receptor. Because psoriasis vulgaris is characterized by epidermal hyperproliferation and infiltration of inflammatory cells, we investigated the expression of IL-8 and its receptor in normal and psoriatic epidermis using semiquantitative reverse-transcriptase-polymerase chain reaction. In addition the mRNA levels of the proto-oncogenes c-ras, c-raf, c-myc, and HER-2 were also investigated as potential growth-promoting stimuli in psoriatic epidermis. IL-8 mRNA was only detected in lesional psoriatic epidermis, and IL-8R-specific mRNA was found to be 10 times increased in lesional psoriatic epidermis. There was no significant difference in the protooncogene mRNA levels. In order to test the relevance of the massively increased IL-8R levels in psoriatic epidermis, we investigated the effect of the antipsoriatic drug FK-506 on specific IL-8 and IL-8R mRNA expression. FK-506 dose dependently inhibited IL-8R expression and function. Our data suggest that in psoriatic skin, elevated IL-8 levels and markedly increased IL-8R expression may act in concert to induce the cardinal signs of psoriasis--epidermal hyperproliferation and leukocyte infiltration. IL-8R may prove a molecular target for antipsoriatic drugs such as FK-506.

  • Copyright © 1993 by American Association of Immunologists

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The Journal of Immunology
Vol. 151, Issue 8
15 Oct 1993
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Increased expression of epidermal IL-8 receptor in psoriasis. Down-regulation by FK-506 in vitro.
B S Schulz, G Michel, S Wagner, R Süss, A Beetz, R U Peter, L Kemény, T Ruzicka
The Journal of Immunology October 15, 1993, 151 (8) 4399-4406;

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Increased expression of epidermal IL-8 receptor in psoriasis. Down-regulation by FK-506 in vitro.
B S Schulz, G Michel, S Wagner, R Süss, A Beetz, R U Peter, L Kemény, T Ruzicka
The Journal of Immunology October 15, 1993, 151 (8) 4399-4406;
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