© 2000 American Heart Association, Inc.
Thrombosis |
Role of Platelet P-Selectin and CD40 Ligand in the Induction of Monocytic Tissue Factor Expression
From the Laboratory for Coagulation Research, Department of Medical Sciences, Clinical Chemistry, University Hospital, Uppsala, Sweden. The first 2 authors contributed equally to this work.
Correspondence to Dr Agneta Siegbahn, Department of Medical Sciences, Clinical Chemistry, University Hospital, S-75185 Uppsala, Sweden. E-mail agneta.siegbahn{at}klinkem.uas.lul.se
Abstract—Activated platelets can express CD40 ligand (CD40L) and trigger inflammatory response and tissue factor (TF) expression in endothelial cells through interaction with CD40. This pathway is also important for T cell–induced monocyte and endothelial cell procoagulant activity. We have studied the potential role of the CD40-CD40L pathway in platelet-induced TF expression in a monocytic cell line and in whole-blood monocytes. In vitamin D3–differentiated U-937 cells, thrombin-stimulated platelets increased TF expression as measured by mRNA quantification, flow cytometry, and procoagulant activity. Maximum antigen expression occurred after 2 hours. Neutralizing anti–P-selectin antibody yielded a 50% suppression of procoagulant activity, whereas antibody to CD40L had no effect. In thrombin receptor activator–stimulated citrated blood, monocytes were up to 77% TF-positive, with peak expression after only 15 minutes. However, no TF mRNA was detectable at that time. Anti–P-selectin antibody reduced TF by 50%, whereas antibody to CD40L gave a 17% reduction. Thus, we conclude that P-selectin exposed on activated platelets induces the expression of TF in both U-937 cells and whole-blood monocytes but by different mechanisms. Platelet CD40L does not display any significant effect on U-937 cells but may be of some importance on whole-blood monocytes. This suggests a possible functional difference between U-937 and monocyte CD40. Another important finding in this study is the rapid appearance of surface TF on monocytes without detectable mRNA formation. This indicates that TF may be stored intracellularly in these cells and can be exposed on the surface independent of de novo protein synthesis.
Key Words: tissue factor • P-selectin • CD40 ligand • monocytes • U-937 cells
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