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1 Department of Biostatistics, Harvard University, Boston 02115
2 Laboratory for Investigative Dermatology, The Rockefeller University, New York, New York 10021
3 Department of Genetics, Washington University School of Medicine, St. Louis 63110
4 Department of Internal Medicine, Division of Dermatology, Baylor University Medical Center, Dallas, Texas 75246
5 Department of Statistics, Harvard University, Cambridge, Massachusetts 02138
6 Departments of Pediatrics and Medicine, Washington University School of Medicine, St. Louis, Missouri 63110
A global picture of gene expression in the common immune-mediated skin disease, psoriasis, was obtained by interrogating the full set of Affymetrix GeneChips with psoriatic and control skin samples. We identified 1,338 genes with potential roles in psoriasis pathogenesis/maintenance and revealed many perturbed biological processes. A novel method for identifying transcription factor binding sites was also developed and applied to this dataset. Many of the identified sites are known to be involved in immune response and proliferation. An in-depth study of immune system genes revealed the presence of many regulating cytokines and chemokines within involved skin, and markers of dendritic cell (DC) activation in uninvolved skin. The combination of many CCR7+ T cells, DCs, and regulating chemokines in psoriatic lesions, together with the detection of DC activation markers in nonlesional skin, strongly suggests that the spatial organization of T cells and DCs could sustain chronic T-cell activation and persistence within focal skin regions.
immune signaling; promoter analysis; chemokines; gene expression
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