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- W366923533 abstract "The family of human epidermal growth factor receptors (EGFR, HER2-4) exerts key functions in normal and malignant epithelial cells. Both EGFR and HER2 are valuable targets for anti-cancer drugs by interfering with ligand binding, receptor dimerization, or tyrosine kinase activity. A similar therapeutic strategy has been advocated for chronic psoriasis since plaque lesions overexpress EGFR and its ligands. Our aim was to characterize EGFR/HER2 protein expression in skin cultures and to evaluate the effects of tyrosine kinase inhibitors on epidermal outgrowth, morphology, and EGFR activation. Human skin explants were established on cell-free dermis and cultured at the air-liquid interface. The impact of small-molecule HER inhibitors on outgrowth was assayed by fluorescence-based image analysis and histometry. Effects of a dual EGFR/HER2 kinase inhibitor, PKI166, on neoepidermis were studied by immunohistochemistry and Western blot. Receptor immunostaining showed in vivo-like distributions with highest EGFR intensity in the proliferative layers whereas HER2 was mainly expressed by suprabasal keratinocytes. Reepithelialization was associated with EGFR autophosphorylation irrespective of exogenous ligand stimulation. PKI166 inhibited neoepidermal EGFR activation, keratinocyte proliferation, and outgrowth from normal and psoriatic skin explants. The rate of epidermalization in presence of other HER inhibitors varied suggesting that drug specificity, potency, and reversibility determine the dynamic outcome. Overall, agents predominantly targeting EGFR kinase were more efficient inhibitors of epidermal regeneration than an HER2-selective drug. The study illustrates the usefulness of a dynamic skin model and emphasizes the potential of HER-directed approaches to control epidermal growth in hyperproliferative skin disorders." @default.
- W366923533 created "2016-06-24" @default.
- W366923533 creator A5024682303 @default.
- W366923533 date "2009-01-01" @default.
- W366923533 modified "2023-09-27" @default.
- W366923533 title "Human Epidermal Growth Factor Receptors and Biological Effects of HER-directed Molecules on Skin Epithelialization" @default.
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