Journal
AMERICAN JOURNAL OF PATHOLOGY
Volume 169, Issue 2, Pages 697-707Publisher
ELSEVIER SCIENCE INC
DOI: 10.2353/ajpath.2006.051211
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P-Selectin expressed on endothelial cells contributes to acute and chronic inflammation by promoting leukocyte tethering/rolling. Despite increasing evidence of P-selectin expression on human umbilical vein endothelial cells in vitro, the regulatory mechanisms of P-selectin expression on dermal endothelial cells in skin diseases are not fully understood. Here, we demonstrate increased expression of P-selectin in dermal vessels of regional skin in urticaria and atopic dermatitis. The present in vitro analyses with human dermal microvascular endothelial. cells (HDMECs) revealed that histamine rapidly induced P-selectin expression. interleukin (IL)-4 and IL-13 induced prolonged expression of surface P-selectin by HDMECs. A combination of tumor necrosis factor-a and IL-4 inhibited P-selectin expression. Pretreatment of HDMECs with tumor necrosis factor-a followed by incubation with IL-4 markedly increased P-selectin expression. Notably, incubation with substance P alone induced prolonged P-selectin expression. Activation of STAT6 appears to be a key factor in P-selectin expression induced by substance P and IL-4 because treatment with STAT6 decoy oligodeoxynucleotides significantly inhibited P-selectin expression. The present results indicate that novel, complex mechanisms are involved in endothelial P-selectin expression in the skin. STAT6 in dermal endothelial cells appears to be a potent target for controlling cellular infiltrate in allergic and/or neuroinflammatory skin diseases.
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