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Circulation. 1995 Dec 1;92(11):3304-11.

Peptido-leukotrienes are potent agonists of von Willebrand factor secretion and P-selectin surface expression in human umbilical vein endothelial cells.

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  • 1Hematology-Oncology Division, Brigham and Women's Hospital, Boston, Mass., USA.

Abstract

BACKGROUND:

The peptido-leukotrienes (LTs) and lipoxins (LX) are produced by platelets through the transcellular conversion of leukocyte-derived LTA4 at sites of vascular inflammation and injury, such as during coronary artery balloon angioplasty. We studied the actions of these eicosanoids on vascular endothelium.

METHODS AND RESULTS:

We found that stimulation of cultured human umbilical vein endothelial cells (EC) with LTC4 and LTD4 resulted in the release of high-molecular-weight multimers of von Willebrand factor (vWF) in a concentration- and time-dependent fashion, as measured by ELISA. Neither LXA4 nor LXB4 stimulated vWF release. LTC4 and LTD4 also stimulated a rapid increase in the surface expression of P-selectin indicated by increased binding of anti-P-selectin monoclonal antibody-coated beads. Fluorescence cytometry detected prolonged peaks of [Ca2+]i in EC in response to concentrations of thrombin and LTD4 that induce near-maximal vWF secretion. In contrast, concentrations of LTC4 that induce similar levels of vWF secretion produced only asynchronous oscillations of [Ca2+]i in most EC and rarely induced prolonged peaks of [Ca2+]i. Depletion of external Ca2+ had no apparent impact on LT-stimulated [Ca2+]i transients and vWF secretion, implicating an intracellular pool as the source of this response. Staurosporine, sphingosine, and H-7 each had only modest effects on peptido-LT-induced vWF secretion, suggesting that protein kinase C is not a primary mediator of peptido-LT-induced exocytosis. Inhibitors of cyclooxygenase and platelet-activating factor had no effect on peptido-LT-mediated vWF secretion.

CONCLUSIONS:

Through the induction of vWF secretion and P-selectin surface expression, peptido-LTs are likely to play an important role in the interrelated processes of hemostasis and inflammation.

PMID:
7586318
[PubMed - indexed for MEDLINE]
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