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Human keratinocytes constitutively express IL‐4 receptor molecules and respond to IL‐4 with an increase in B7/BB1 expression
Author(s) -
Junghans V.,
Jung T.,
Neumann C.
Publication year - 1996
Publication title -
experimental dermatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.108
H-Index - 96
eISSN - 1600-0625
pISSN - 0906-6705
DOI - 10.1111/j.1600-0625.1996.tb00135.x
Subject(s) - keratinocyte , monoclonal antibody , cd86 , cytokine , receptor , flow cytometry , interleukin 20 , hacat , immunology , biology , interleukin , chemistry , microbiology and biotechnology , cell culture , t cell , interleukin 5 , antibody , immune system , biochemistry , genetics
In certain pathological conditions, such as atopic dermatitis, interleukin‐4 (IL‐4) can be detected in the skin. As the rôle of this cytokine in inflammatory skin lesions is not completely clear, we investigated its biological effects on skin keratinocytes. It was found that freshly isolated as well as cultured keratinocytes obtained from normal individuals express mRNA for the IL‐4 receptor (IL‐4R) and produce IL‐4R protein, as determined by How cytometry. Moreover, IL‐4 induced a proliferative response in keratinocyles after 1 day of culture and enhanced B7/BB1 expression in these cells. B7‐2 (CD86) mRNA and protein were neither detected on untreated nor IL‐4 treated keratinocytes. In contrast to interferon‐γ (IFN‐γ), IL‐4 did not induce ICAM‐1 (CD54) or HLA‐DR‐expression. Keratinocytes which had been treated with IL‐4 showed an enhanced ability to stimulate allogeneic T‐cell proliferation in the presence of staphylococcus enterotoxin B (SEB),( p <0.01). Neutralizing anti‐ B7/BBI monoclonal antibodies did not block this effect. These results indicate that other molecules than B7/BB‐I, HLA‐DR or ICAM‐1 on IL‐4‐activated keratinocytes may be involved in T‐cell stimulation. In conclusion our results suggest, that locally produced IL‐4, besides modulating keratinocyte membrane molecules, may enable keratinoeytes to interact with skin infiltrating lymphocytes.