Adhesion of human and mouse platelets to collagen under shear: a unifying model

ABSTRACT There is presently confusion as to the roles of α2β1 and GPVI in supporting platelet adhesion and aggregate formation on collagen at intermediate/high shear. Recent studies have reported essential, partial, or dispensable roles for either receptor in supporting these events, and the possibi...

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Bibliographic Details
Published in:The FASEB journal 2005-05, Vol.19 (7), p.825-827
Main Authors: Auger, Jocelyn M, Kuijpers, Marijke J. E, Senis, Yotis A, Watson, Steve P, Heemskerk, Johan W. M
Format: Article
Language:English
Subjects:
Animals
Collagen - metabolism
GPVI-mediated platelet activation
Humans
Integrin alpha2beta1 - physiology
Intracellular Signaling Peptides and Proteins - pharmacology
Mice
Mice, Inbred C57BL
Models, Biological
Platelet Adhesiveness - physiology
Platelet Aggregation - physiology
Platelet Glycoprotein GPIIb-IIIa Complex - physiology
Platelet Membrane Glycoproteins - physiology
Rheology
Src kinase
src-Family Kinases - antagonists & inhibitors
src-Family Kinases - physiology
thrombus
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Summary:ABSTRACT There is presently confusion as to the roles of α2β1 and GPVI in supporting platelet adhesion and aggregate formation on collagen at intermediate/high shear. Recent studies have reported essential, partial, or dispensable roles for either receptor in supporting these events, and the possibility that there may be fundamental differences between their roles in human and mouse platelets has been proposed. Further, the recent recognition that Src family tyrosine kinases contribute to signaling by α2β1 and other adhesive receptors, in addition to GPVI, has added to this debate. The present study compares the roles of α2β1, GPVI, and Src‐dependent kinases in supporting adhesion and aggregation in human and mouse platelets in whole blood using blocking antibodies, mutant mice, and a novel inhibitor of Src kinases, PD0173952, which is effective in plasma. The results demonstrate that the fundamental processes of adhesion and aggregate formation are conserved in mice and human platelets and that two mechanisms of stable adhesion and activation on collagen exist. These can be distinguished by the contributions of GPVI and α2β1, with GPVI‐mediated platelet activation either preceding or following integrin‐mediated adhesion. The relative contribution of each pathway depends on environmental conditions and may also reflect platelet heterogeneity. These observations form the basis of a unifying two‐state model of platelet adhesion and aggregate formation on collagen that is conserved between human and mouse platelets.
ISSN:0892-6638
1530-6860
DOI:10.1096/fj.04-1940fje