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2017 ; 7
(1
): 4810
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Thrombin-induced cytoskeleton dynamics in spread human platelets observed with
fast scanning ion conductance microscopy
#MMPMID28684746
Seifert J
; Rheinlaender J
; Lang F
; Gawaz M
; Schäffer TE
Sci Rep
2017[Jul]; 7
(1
): 4810
PMID28684746
show ga
Platelets are small anucleate blood cells involved in haemostasis. Platelet
activation, caused by agonists such as thrombin or by contact with the
extracellular matrix, leads to platelet adhesion, aggregation, and coagulation.
Activated platelets undergo shape changes, adhere, and spread at the site of
injury to form a blood clot. We investigated the morphology and morphological
dynamics of human platelets after complete spreading using fast scanning ion
conductance microscopy (SICM). In contrast to unstimulated platelets,
thrombin-stimulated platelets showed increased morphological activity after
spreading and exhibited dynamic morphological changes in the form of wave-like
movements of the lamellipodium and dynamic protrusions on the platelet body. The
increase in morphological activity was dependent on thrombin concentration. No
increase in activity was observed following exposure to other activation agonists
or during contact-induced activation. Inhibition of actin polymerization and
inhibition of dynein significantly decreased the activity of thrombin-stimulated
platelets. Our data suggest that these morphological dynamics after spreading are
thrombin-specific and might play a role in coagulation and blood clot formation.