Abstract
12-Hydroxyeicosatetraenoic acid (12-HETE), a product of the platelet lipoxygenase pathway, amplifies tissue factor expression by P-selectin-stimulated monocytes in a time- and dose-dependent fashion. The same effect is observed when monocytes are incubated with Chinese hamster ovary cells transfected with the P-selectin cDNA. Both 5-HETE and leukotriene C 4 are inactive in this system. Furthermore, the effect is not dependent on non-specific monocyte adhesion, since monocytes incubated with CHO cells expressing E-selectin do not express tissue factor, either in the presence or in the absence of 12-HETE. These results show that 12-HETE is a cofactor for the expression of tissue factor by monocytes.
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