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Monocyte functional responsiveness after PSGL-1-mediated platelet adhesion is dependent on platelet activation status

Bournazos, Stylianos; Rennie, Jillian; Hart, Simon P.; Fox, Keith A. A.; Dransfield, Ian

Authors

Stylianos Bournazos

Jillian Rennie

Keith A. A. Fox

Ian Dransfield



Abstract

OBJECTIVE: Acute coronary diseases are characterized by elevated levels of circulating platelet-leukocyte complexes, raising the possibility that proinflammatory processes might be initiated in leukocytes after platelet adhesion. Here we examined the mechanism of platelet binding to polymorphonuclear leukocytes, monocytes, and monocyte subsets and investigated the potential functional consequences of monocyte binding to minimally activated or thrombin-activated platelets. METHODS AND RESULTS: In this article, we describe key differences in terms of stability of PSGL-1-mediated interaction of platelets with monocytes and polymorphonuclear leukocytes and a small but significant difference in platelet binding to monocyte subsets (CD14(high) and CD14(low)/HLA-DR(high)). We also report differential effects of platelet binding on monocyte functional responses between minimally and thrombin-activated platelets. In particular, monocyte CD11b expression and release of proinflammatory cytokines, like interleukin 1beta and tumor necrosis factor alpha, were significantly upregulated on adhesion of stimulated platelets, whereas unstimulated platelets had no effect. Moreover, binding of unstimulated, but not of thrombin-activated, platelets to monocytes had no impact on NF-kappaB activity, monocyte migration, and induction of apoptosis in the absence of survival factors. CONCLUSIONS: Our data suggest that in the absence of overt activation, PSGL-1-P-selectin-dependent platelet binding to monocytes represents a normal physiological process with little impact on the potential of monocytes to cause vascular injury

Citation

Bournazos, S., Rennie, J., Hart, S. P., Fox, K. A. A., & Dransfield, I. (2008). Monocyte functional responsiveness after PSGL-1-mediated platelet adhesion is dependent on platelet activation status. Arteriosclerosis, Thrombosis, and Vascular Biology, 28(8), 1491-1498. https://doi.org/10.1161/ATVBAHA.108.167601

Journal Article Type Article
Online Publication Date May 22, 2008
Publication Date Aug 1, 2008
Deposit Date Nov 13, 2014
Publicly Available Date Mar 28, 2024
Journal Arteriosclerosis, thrombosis, and vascular biology
Print ISSN 1079-5642
Electronic ISSN 1524-4636
Publisher American Heart Association
Peer Reviewed Peer Reviewed
Volume 28
Issue 8
Pages 1491-1498
DOI https://doi.org/10.1161/ATVBAHA.108.167601
Keywords Apoptosis, Blood Platelets, Cell Adhesion, Coronary Disease, Cytokines, Disease, France, Humans, Inflammation, injuries, Interleukin-1beta, Leukocytes, Membrane Glycoproteins, methods, Monocytes, Necrosis, Neutrophils, physiology, Platelet Adhesiveness, R
Public URL https://hull-repository.worktribe.com/output/464994
Publisher URL http://atvb.ahajournals.org/content/28/8/1491