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. 1989 Aug;84(2):546–552. doi: 10.1172/JCI114197

Glycoprotein IV mediates thrombospondin-dependent platelet-monocyte and platelet-U937 cell adhesion.

R L Silverstein 1, A S Asch 1, R L Nachman 1
PMCID: PMC548914  PMID: 2474571

Abstract

An adhesive interaction between activated platelets and mononuclear phagocytes may contribute to the role these cells play in regulating inflammation, thrombosis, and atherosclerosis. We have previously shown that this adhesive interaction is mediated by the expression of the glycoprotein thrombospondin (TSP) on the surface of activated platelets. We now show that TSP-dependent platelet-monocyte interactions are mediated by glycoprotein IV (GPIV), an intrinsic membrane protein recently identified as a cell surface TSP receptor. Monoclonal antibodies to GPIV bound to cells of the human monocytoid line U937 as assessed by flow cytometry and inhibited the binding of 125I-TSP to the cell surface by 83%. U937 cells preincubated with anti-GPIV were not rosetted by thrombin-stimulated platelets (72% inhibition compared with control anti-monocyte antibodies). In addition, when platelets were stimulated in the presence of saturating concentrations of monoclonal antibodies to GPIV, only 18% of U937 cells were rosetted (78% inhibition). Control antibodies including anti-GPIb did not inhibit rosette formation. These data suggest that TSP can cross-link platelets and monocytes via an interaction with GPIV on the surface of both cells. This molecular bridge may mediate platelet-macrophage communication in various pathophysiologic settings.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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