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Borrelli, Serena; Fanoni, Daniele; Dolfini, Diletta; Alotto, Daniela; Ravo, Maria; Grober, Olì Maria Victoria; Weisz, Alessandro; Castagnoli, Carlotta; Berti, Emilio; Vigano, M Alessandra; Mantovani, Roberto
PloS one, 11/2010, Letnik: 5, Številka: 11Journal Article
C/EBPs are a family of B-Zip transcription factors--TFs--involved in the regulation of differentiation in several tissues. The two most studied members--C/EBPα and C/EBPβ--play important roles in skin homeostasis and their ablation reveals cells with stem cells signatures. Much less is known about C/EBPδ which is highly expressed in the granular layer of interfollicular epidermis and is a direct target of p63, the master regular of multilayered epithelia. We identified C/EBPδ target genes in human primary keratinocytes by ChIP on chip and profiling of cells functionally inactivated with siRNA. Categorization suggests a role in differentiation and control of cell-cycle, particularly of G2/M genes. Among positively controlled targets are numerous genes involved in barrier function. Functional inactivation of C/EBPδ as well as overexpressions of two TF targets--MafB and SOX2--affect expression of markers of keratinocyte differentiation. We performed IHC on skin tumor tissue arrays: expression of C/EBPδ is lost in Basal Cell Carcinomas, but a majority of Squamous Cell Carcinomas showed elevated levels of the protein. Our data indicate that C/EBPδ plays a role in late stages of keratinocyte differentiation.
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