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2014 ; 124
(11
): 1824-31
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A systems approach to hemostasis: 3 Thrombus consolidation regulates
intrathrombus solute transport and local thrombin activity
#MMPMID24951426
Stalker TJ
; Welsh JD
; Tomaiuolo M
; Wu J
; Colace TV
; Diamond SL
; Brass LF
Blood
2014[Sep]; 124
(11
): 1824-31
PMID24951426
show ga
Hemostatic thrombi formed after a penetrating injury have a distinctive structure
in which a core of highly activated, closely packed platelets is covered by a
shell of less-activated, loosely packed platelets. We have shown that differences
in intrathrombus molecular transport emerge in parallel with regional differences
in platelet packing density and predicted that these differences affect thrombus
growth and stability. Here we test that prediction in a mouse vascular injury
model. The studies use a novel method for measuring thrombus contraction in vivo
and a previously characterized mouse line with a defect in integrin ?IIb?3
outside-in signaling that affects clot retraction ex vivo. The results show that
the mutant mice have a defect in thrombus consolidation following vascular
injury, resulting in an increase in intrathrombus transport rates and, as
predicted by computational modeling, a decrease in thrombin activity and platelet
activation in the thrombus core. Collectively, these data (1) demonstrate that in
addition to the activation state of individual platelets, the physical properties
of the accumulated mass of adherent platelets is critical in determining
intrathrombus agonist distribution and platelet activation and (2) define a novel
role for integrin signaling in the regulation of intrathrombus transport rates
and localization of thrombin activity.