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(American Journal of Pathology. 2006;169:697-707.)
© 2006 American Society for Investigative Pathology
DOI: 10.2353/ajpath.2006.051211

STAT-6-Mediated Control of P-Selectin by Substance P and Interleukin-4 in Human Dermal Endothelial Cells

Yasuhiro Miyazaki*, Takahiro Satoh*, Kiyoshi Nishioka{dagger} and Hiroo Yokozeki*

From the Department of Dermatology,* Graduate School, Tokyo Medical and Dental University, Tokyo, Japan; and Yokohama-Minato Red Cross Hospital,{dagger} Kanagawa, Japan

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-{alpha} and IL-4 inhibited P-selectin expression. Pretreatment of HDMECs with tumor necrosis factor-{alpha} 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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Copyright © 2006 by the American Society for Investigative Pathology.