Expression, subcellular localization and cytokinic modulation of Toll-like receptors (TLRs) in normal human keratinocytes: TLR2 up-regulation in psoriatic skin.
The aim of the research described here was to investigate the expression of Toll-like receptors (TLRs) in normal human keratinocytes, to study its modulation by proinflammatory cytokines, and to characterize the function of the latter within the epidermis. Our results demonstrate that normal human keratinocytes may present an intra-cytoplasmic expression of TLR2, TLR3, and TLR4. Exposure of keratinocytes to IFN-gamma and TNF-alpha increased intra-cytoplasmic expression and led to partial translocation at the cell surface. Keratinocyte activation by TLR2, TLR3, and TLR4 ligands led to the nuclear translocation of NF-kappab and the release of proinflammatory cytokines TNF-alpha and IL-8. In immunochemistry analysis, psoriatic skin showed a strong over-expression of TLR2 in the epidermis compared with normal skin. Our results thus demonstrate large TLR expression in keratinocytes and the functionality of TLRs 2, 3, and 4. TLR2 over-expression in psoriatic skin provides new insights into TLR implication in the pathogenesis of psoriasis, through inappropriate stimulation by infectious or endogen ligands.
Begon
Edouard
E
INSERM U532, Institut de Recherche sur la Peau, Centre Hospitalier Universitaire, Hôpital Saint Louis, 1 avenue Claude Vellefaux, 75010, Paris, France.
Michel
Laurence
L
Flageul
Béatrice
B
Beaudoin
Isabelle
I
Jean-Louis
Francette
F
Bachelez
Hervé
H
Dubertret
Louis
L
Musette
Philippe
P
D002478:Cells, Cultured; D024202:Electrophoretic Mobility Shift Assay; D006801:Humans; D007159:Immunologic Tests; D007371:Interferon-gamma / Q000494:pharmacology; D016209:Interleukin-8 / Q000378:metabolism; D015603:Keratinocytes / Q000166:cytology / Q000187:drug effects / Q000378:metabolism*; D008070:Lipopolysaccharides / Q000494:pharmacology; D016328:NF-kappa B / Q000378:metabolism; D010457:Peptidoglycan / Q000494:pharmacology; D011070:Poly I-C / Q000494:pharmacology; D011565:Psoriasis / Q000378:metabolism*; D012333:RNA, Messenger / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D012867:Skin / Q000187:drug effects / Q000378:metabolism*; D051195:Toll-Like Receptor 2 / Q000235:genetics / Q000378:metabolism*; D051193:Toll-Like Receptors / Q000235:genetics / Q000378:metabolism*; D014409:Tumor Necrosis Factor-alpha / Q000378:metabolism / Q000494:pharmacology; D015854:Up-Regulation
D016209:Interleukin-8; D008070:Lipopolysaccharides; D016328:NF-kappa B; D010457:Peptidoglycan; D012333:RNA, Messenger; D051195:Toll-Like Receptor 2; D051193:Toll-Like Receptors; D014409:Tumor Necrosis Factor-alpha; D007371:Interferon-gamma; D011070:Poly I-C