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The Journal of Immunology, 1999, 162: 7140-7147.
Copyright © 1999 by The American Association of Immunologists

Crosstalk Between Keratinocytes and T Lymphocytes via Fas/Fas Ligand Interaction: Modulation by Cytokines

Ralf Arnold1,*, Martina Seifert*, Khusru Asadullah{dagger} and Hans Dieter Volk*

* Institute of Medical Immunology and {dagger} Department of Dermatology, Charité Campus Mitte, Humboldt University, Berlin, Germany

Apoptosis mediated by Fas/FasL interaction plays an important role during many inflammatory skin disorders. To estimate whether the expression of FasL, the ligand for Fas, might be regulated by cytokines we stimulated primary human keratinocytes with several pro- and anti-inflammatory cytokines. Keratinocytes cultured to subconfluence expressed FasL constitutively. Cells stimulated with the proinflammatory cytokines IL-1ß, TNF-{alpha}, IFN-{gamma}, and IL-15, respectively, increased significantly their intracellular as well as cell surface-bound FasL expression in a time- and dose-dependent manner. This cytokine-induced FasL expression was dependent on new protein synthesis. Despite enhanced expression of cell surface-bound FasL, no release of soluble FasL was measured in the cell supernatants determined by ELISA. Stimulation of the cells with IL-6, IL-10, IL-12, TGF-ß1, and GM-CSF did not modulate the constitutive FasL expression, but IFN-{gamma}-mediated FasL up-regulation was significantly diminished by IL-10 and TGF-ß1, respectively. Up-regulation of FasL on IFN-{gamma}-stimulated keratinocytes led to increased apoptosis within monolayers cultured for 48 h. Moreover, coculture experiments performed with Fas+ Jurkat T cells revealed that enhanced FasL expression on IFN-{gamma}-stimulated keratinocytes induced apoptosis in cocultured T cells, demonstrating that up-regulated FasL was functionally active. In summary, our data suggest the important regulatory role of cytokine-controlled Fas/FasL interaction in the cross-talk between keratinocytes and skin-infiltrating T cells for maintenance of homeostasis in inflammatory skin processes.




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