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Blood. 2007 Sep 15;110(6):1864-70. Epub 2007 Jun 4.

The oxidase activity of vascular adhesion protein-1 (VAP-1) induces endothelial E- and P-selectins and leukocyte binding.

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MediCity Research Laboratory, University of Turku, Turku, Finland.


Leukocyte migration from the blood into tissues is pivotal in immune homeostasis and in inflammation. During the multistep extravasation cascade, endothelial selectins (P- and E-selectin) and vascular adhesion protein-1 (VAP-1), a cell-surface-expressed oxidase, are important in tethering and rolling. Here, we studied the signaling functions of the catalytic activity of VAP-1. Using human endothelial cells transfected with wild-type VAP-1 and an enzymatically inactive VAP-1 point mutant, we show that transcription and translation of E- and P-selectins are induced through the enzymatic activity of VAP-1. Moreover, use of VAP-1-deficient animals and VAP-1-deficient animals carrying the human VAP-1 as a transgene show a VAP-enzyme activity-dependent induction of P-selectin in vivo. Up-regulation of P-selectin was found both in high endothelial venules in lymphoid tissues and in flat-walled vessels in noninflamed tissues. VAP-1 activity in vivo led to increased P-selectin-dependent binding of lymphocytes to endothelial cells. These data show that the oxidase reaction catalyzed by VAP-1 alters the expression of other molecules involved in the leukocyte extravasation cascade. Our findings indicate cross-talk between adhesion molecules involved in the tethering and rolling of leukocytes and show that VAP-1-dependent signaling can prime the vessels for an enhanced inflammatory response.

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  • Blood. 2007 Sep 15;110(6):1706-7.
[Indexed for MEDLINE]
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