Abstract
Models of reconstructed human epidermis (RHE) holding proliferating and fully differentiated cultured keratinocytes allow in vitro investigation of early molecular and cellular epidermal events during the complex response of keratinocytes at the onset of allergic contact dermatitis (ACD) or sensitization. In this study, data collected on RHE exposed to well-characterized sensitizing chemicals, such as dinitrofluorobenzene, oxazolone, cinnamaldehyde and isoeugenol, revealed a transient expression of IL-8 mRNA in association with abundant IL-8 cell release. Investigations of keratinocyte signaling illustrate transient activation by tissue exposure to sensitizing chemicals of the epidermal growth factor receptor (EGFR). This activation of EGFR tyrosine kinase is involved in the expression and release of IL-8. The IL-8 release appears also to be partially dependent on p38 and ERK 1/2 MAPK activation. Moreover, data suggest that heparin-binding EGF-like growth factor (HB-EGF) expression and release induced after exposure of RHE to sensitizing chemicals are also under the control of EGFR tyrosine kinase activity, independently of the IL-8 expression and release. Mechanistic approach of keratinocyte responses in the context of RHE underlying regulation of expression and release of epidermal cytokines and growth factors after topical application of sensitizing chemicals is proposed to identify biomarkers which could then be analysed for in vitro toxicological screening of new or undefined compounds.
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Abbreviations
- AD:
-
Atopic dermatitis
- ACD:
-
Allergic contact dermatitis
- BC:
-
Benzalkonium chloride
- Cin:
-
Cinnamaldehyde
- DC:
-
Dendritic cell
- DNFB:
-
2,4-Dinitrofluorobenzene
- GPCR:
-
G protein-coupled receptor
- ICD:
-
Irritant contact dermatitis
- IL:
-
Interleukin
- Iso:
-
Isoeugenol
- KGF:
-
Keratinocyte growth factor
- MAPK:
-
Mitogen-activated protein kinase
- MβCD:
-
Methyl-β-cyclodextrin
- Oxa:
-
Oxazolone
- RHE:
-
Reconstructed human epidermis
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Acknowledgments
Technical help from D. Van Vlaender, F. Herphelin and V. De Glas is gratefully acknowledged. Contract grant sponsor was Henkel AG & CoKGaA, FNRS 1.5.033.06F and FRFC 2.4.522.10F.
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Frankart, A., Coquette, A., Schroeder, KR. et al. Studies of cell signaling in a reconstructed human epidermis exposed to sensitizers: IL-8 synthesis and release depend on EGFR activation. Arch Dermatol Res 304, 289–303 (2012). https://doi.org/10.1007/s00403-012-1209-5
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DOI: https://doi.org/10.1007/s00403-012-1209-5