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2014 ; 124
(11
): 1808-15
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A systems approach to hemostasis: 1 The interdependence of thrombus architecture
and agonist movements in the gaps between platelets
#MMPMID24951424
Welsh JD
; Stalker TJ
; Voronov R
; Muthard RW
; Tomaiuolo M
; Diamond SL
; Brass LF
Blood
2014[Sep]; 124
(11
): 1808-15
PMID24951424
show ga
Hemostatic thrombi develop a characteristic architecture in which a core of
highly activated platelets is covered by a shell of less-activated platelets.
Here we have used a systems biology approach to examine the interrelationship of
this architecture with transport rates and agonist distribution in the gaps
between platelets. Studies were performed in mice using probes for platelet
accumulation, packing density, and activation plus recently developed transport
and thrombin activity probes. The results show that intrathrombus transport
within the core is much slower than within the shell. The region of slowest
transport coincides with the region of greatest packing density and thrombin
activity, and appears prior to full platelet activation. Deleting the
contact-dependent signaling molecule, Sema4D, delays platelet activation, but not
the emergence of the low transport region. Collectively, these results suggest a
timeline in which initial platelet accumulation and the narrowing gaps between
platelets create a region of reduced transport that facilitates local thrombin
accumulation and greater platelet activation, whereas faster transport rates
within the shell help to limit thrombin accumulation and growth of the core.
Thus, from a systems perspective, platelet accumulation produces an altered
microenvironment that shapes thrombus architecture, which in turn affects agonist
distribution and subsequent thrombus growth.