Abstract
In the meta-analysis of public microarray databases for different skin diseases, we revealed seven commonly up-regulated genes, DSG3, KRT6, MAP17, PLSCR1, RPM2, SOD2 and SPRR2B. We postulated that the genes selected from the meta-analysis may be potentially associated with the abnormal keratinocyte differentiation. To demonstrate this postulation, we alternatively evaluated whether the genes of interest in the meta-analysis can be regulated by T-helper (Th) cell cytokines in normal human epidermal keratinocytes (NHEK). We found that MAP17 was significantly up-regulated in response to interferon-gamma, interleukin 4 (IL-4), IL-6, IL-17A or IL-22 in NHEK. Interestingly, MAP17 was originally reported to interact with PDZK1; in turn, the PDZK1 gene is localized within the atopic dermatitis-linked region on human chromosome 1q21. In an attempt to evaluate whether MAP17 regulates the expression of cornified envelope-associated genes at the 1q21 locus, such as filaggrin, loricrin and involucrin, we found that the over-expression of MAP17 in HaCaT keratinocytes significantly decreased the expression of filaggrin. Taken together, the Th cell cytokine-induced up-regulation of MAP17 expression may be linked to the down-regulation of filaggrin in NHEK, which may be associated with the abnormal epidermal differentiation observed in the dermatological diseases.
MeSH terms
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Cell Differentiation / genetics
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Cell Line, Transformed
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Cells, Cultured
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Computational Biology
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Cytokines / pharmacology*
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Databases, Genetic
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Desmoglein 3 / genetics
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Down-Regulation / genetics*
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Filaggrin Proteins
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Gene Expression / drug effects
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Gene Expression / genetics
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Gene Expression Profiling
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Gene Expression Regulation / genetics
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Humans
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Interferon-gamma / pharmacology
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Interleukin-17 / pharmacology
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Interleukin-22
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Interleukin-4 / pharmacology
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Interleukins / pharmacology
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Intermediate Filament Proteins / genetics*
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Keratin-10 / genetics
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Keratin-6 / genetics
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Keratinocytes / drug effects
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Keratinocytes / metabolism*
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Membrane Proteins / genetics*
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Phospholipid Transfer Proteins / genetics
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Protein Precursors / genetics
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Skin Diseases / metabolism
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Superoxide Dismutase / genetics
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T-Lymphocytes, Helper-Inducer / metabolism*
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Transcription, Genetic / genetics*
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Transfection
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Transglutaminases / genetics
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Up-Regulation / genetics
Substances
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Cytokines
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DSG3 protein, human
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Desmoglein 3
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FLG protein, human
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Filaggrin Proteins
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Interleukin-17
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Interleukins
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Intermediate Filament Proteins
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KRT10 protein, human
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KRT6A protein, human
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Keratin-6
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Membrane Proteins
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PDZK1IP1 protein, human
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PLSCR1 protein, human
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Phospholipid Transfer Proteins
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Protein Precursors
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loricrin
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Keratin-10
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Interleukin-4
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involucrin
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Interferon-gamma
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Superoxide Dismutase
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superoxide dismutase 2
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Transglutaminases