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  • KERATINOCYTES  (3)
  • 1
    Keywords: RECEPTOR ; EXPRESSION ; GROWTH ; GROWTH-FACTOR ; proliferation ; Germany ; IN-VIVO ; NETWORKS ; SYSTEM ; GENE ; GENE-EXPRESSION ; HYBRIDIZATION ; transcription ; DIFFERENTIATION ; TISSUE ; COMPLEX ; COMPLEXES ; TRANSCRIPTION FACTOR ; AP-1 ; KERATINOCYTES ; SKIN ; C-JUN ; fibroblasts ; cytokines ; antibodies ; antibody ; MOUSE ; IN-SITU ; gene expression ; REPAIR ; SIGNALING PATHWAY ; HUMAN KERATINOCYTES ; Jun ; gene expression profiling ; expression profiling ; COLONY-STIMULATING FACTOR ; FACTOR GENE-EXPRESSION ; FUNCTIONAL EXPRESSION ; in situ hybridization ; keratinocyte ; regulation ; mesenchyme ; SDF-1 ; CHEMOKINE RECEPTORS ; INFLAMMATORY CYTOKINES ; CELL-DERIVED FACTOR ; CXCL12 ; GROWTH-ASSOCIATED MOLECULE ; HB-GAM ; LARGE INDUCTION ; pleiotrophin
    Abstract: In skin, fibroblasts of the connective tissue play a decisive role in epidermal homeostasis and repair by contributing to the regulation of keratinocyte proliferation and differentiation. The AP-1 transcription factor subunit JUN plays a crucial role in this mesenchymal-epithelial interplay by regulating the expression of two critical paracrine-acting cytokines, keratinocyte growth factor (KGF) and granulocyte-macrophage colony-stimulating factor (GMCSF). We have performed gene expression profiling of wildtype and Jun(-/-) mouse embryonic fibroblasts to identify additional players involved in this complex network, and have found pleiotrophin (PTN) and the stromal cell-derived factor 1 (SDF-1) as novel JUN-regulated factors. Both cytokines are expressed by dermal fibroblasts in vivo, as shown by semi-quantitative RT-PCR and in situ hybridization on murine skin sections. Using a heterologous feeder layer co-culture system, we demonstrated that PTN and SDF-1 exert a mitogenic effect on primary human keratinocytes. Moreover, SDF-1-induced keratinocyte proliferation could be specifically inhibited by neutralizing antibodies against SDF-1 or its receptor, CXCR4. Consistent with its role in promoting keratinocyte growth, PTN was upregulated during cutaneous wound healing in vivo. Interestingly, co-cultivation with keratinocytes stimulated PTN expression but repressed SDF-1 production in fibroblasts, demonstrating the complexity of the paracrine regulatory cytokine networks that control skin homeostasis and regeneration
    Type of Publication: Journal article published
    PubMed ID: 15840658
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  • 2
    Keywords: APOPTOSIS ; CELLS ; GROWTH ; GROWTH-FACTOR ; IN-VITRO ; proliferation ; CELL ; IN-VIVO ; VITRO ; VIVO ; GENE ; GENES ; PROTEIN ; PROTEINS ; transcription ; cell line ; DIFFERENTIATION ; EPITHELIA ; LINES ; MECHANISM ; FAMILY ; TRANSCRIPTION FACTOR ; KERATINOCYTES ; mechanisms ; SKIN ; BIOLOGY ; CELL-LINES ; MEMBER ; culture ; TARGET ; TRANSCRIPTION FACTORS ; ENCODES ; genetics ; CELL-LINE ; LINE ; BETA ; ONCOGENE ; EPITHELIAL-CELLS ; GROWTH-FACTOR-BETA ; TARGETS ; cell lines ; epidermis ; heredity ; REGULATOR ; MORPHOGENESIS ; ONCOLOGY ; FAMILIES ; WOUND REPAIR ; FUNCTIONAL-CHARACTERIZATION ; TGF-BETA ; TGF-beta 1 ; SWITZERLAND ; LEVEL ; TARGET GENES ; EPITHELIUM ; function ; in vivo ; wound ; TRANSFORMING-GROWTH-FACTOR ; activin ; BINDING PROTEINS ; BONE MORPHOGENETIC PROTEIN ; KERATINOCYTE CELL-LINE ; LOOP-HELIX PROTEINS ; TRANSGENIC MICE REVEALS
    Abstract: Activin is a member of the transforming growth factor beta (TGF-beta) family, which plays a crucial role in skin morphogenesis and wound healing. To gain insight into the underlying mechanisms of action, we searched for activin-regulated genes in cultured keratinocytes. One of the identified target genes encodes Id1, a negative regulator of helix-loop-helix transcription factors. We show that Id1, Id2, and Id3 are strongly downregulated by activin in keratinocytes in vitro and in vivo. To determine the role of Id1 in keratinocyte biology, we generated stable HaCaT keratinocyte cell lines overexpressing this protein. Our results revealed that enhanced levels of Id1 do not affect proliferation of keratinocytes in monoculture under exponential culture conditions or in response to activin or TGF-beta 1. However, in three-dimensional organotypic cultures, Id1-overexpressing HaCaT cells formed a hyperthickened and disorganized epithelium that was characterized by enhanced keratinocyte proliferation, abnormal differentiation, and an increased rate of apoptosis. These results identify an important function of Id1 in the regulation of epidermal homeostasis
    Type of Publication: Journal article published
    PubMed ID: 16288215
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  • 3
    Keywords: EXPRESSION ; GROWTH ; IN-VITRO ; evaluation ; Germany ; IN-VIVO ; VIVO ; CDNA ; CLONES ; GENE ; GENE-EXPRESSION ; GENES ; microarray ; transcription ; TISSUE ; RELEASE ; NF-KAPPA-B ; INJURIES ; MECHANISM ; TRANSCRIPTION FACTOR ; AP-1 ; KERATINOCYTES ; mechanisms ; SKIN ; C-JUN ; fibroblasts ; SIGNAL ; TARGET ; IDENTIFICATION ; gene expression ; SUBUNIT ; REPAIR ; WILD-TYPE ; Jun ; SUBUNITS ; GROWTH-FACTOR-BETA ; DIFFERENTIAL EXPRESSION ; expression profiling ; DISSECTION ; SECTIONS ; INJURY ; CDNA MICROARRAY ; MOLECULAR-MECHANISM ; fibroblast ; mesenchyme ; GLUCOCORTICOID-TREATED MICE ; MOUSE DEVELOPMENT ; SKIN FRAGILITY
    Abstract: Mesenchymal - epithelial interactions are increasingly considered to be of vital importance for epithelial homeostasis and regeneration. In skin, the transcription factor AP-1 was shown to be critically involved in the communication between keratinocytes and dermal. broblasts. After skin injury, the release of IL-1 from keratinocytes induces the activity of the AP-1 subunits c-Jun and JunB in. broblasts leading to a global change in gene expression. To identify AP-1 target genes in. broblasts, which are involved in the process of cutaneous repair, we performed gene expression pro. ling of wild-type, c-jun- and junB-deficient. broblasts in response to IL-1, mimicking the initial phase of wound healing. Using a 15K cDNA collection, over 1000 genes were found to be Jun-dependent and additional 300 clones showed IL-1 responsiveness. Combinatorial evaluation allowed for the dissection of the specific contribution of either AP-1 subunit to gene regulation. Besides previously identified genes that are involved in cutaneous repair, we have identified novel genes regulated during wound healing in vivo and showed their expression by. broblasts on wound sections. The identification of novel Jun target genes should provide a basis for understanding the molecular mechanisms underlying mesenchymal - epithelial interactions and the critical contribution of AP-1 to tissue homeostasis and repair
    Type of Publication: Journal article published
    PubMed ID: 15273721
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