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Simon F. De Meyer
Katholieke Universiteit Leuven
ImmunologyVon Willebrand factorADAMTS13MedicinePlatelet
120Publications
24H-index
2,116Citations
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Publications 86
Newest
#1Elien Roose (Katholieke Universiteit Leuven)H-Index: 7
#2An-Sofie Schelpe (Katholieke Universiteit Leuven)H-Index: 4
Last. Tanja FalterH-Index: 5
view all 28 authors...
Recently, we showed that during the acute phase of immune-mediated thrombotic thrombocytopenic purpura (iTTP), ADAMTS13 circulates in an open conformation. Although the cause of this conformational change in acute iTTP remains elusive, ADAMTS13 is mainly closed in iTTP patients (i) in remission with an ADAMTS13 activity >50% and undetectable anti-ADAMTS13 autoantibodies, and (ii) after rituximab treatment, suggesting a role for anti-ADAMTS13 autoantibodies. Therefore, IgGs from 18 acute iTTP pat...
2 CitationsSource
#1Kadri Kangro (Katholieke Universiteit Leuven)H-Index: 1
#2Elien Roose (Katholieke Universiteit Leuven)H-Index: 7
Last. Karen Vanhoorelbeke (Katholieke Universiteit Leuven)H-Index: 38
view all 9 authors...
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#1Sirima Kraisin (Katholieke Universiteit Leuven)H-Index: 1
#2Kimberly Martinod (Katholieke Universiteit Leuven)H-Index: 23
Last. Simon F. De Meyer (Katholieke Universiteit Leuven)H-Index: 24
view all 9 authors...
BACKGROUND Cerebral malaria (CM) is the most severe complication in malaria. Endothelial activation, cytokine release and vascular obstruction are essential hallmarks of CM. Clinical studies have suggested a link between von Willebrand factor (VWF) and malaria pathology. OBJECTIVES To investigate the contribution of VWF in the pathogenesis of experimental cerebral malaria (ECM). METHODS Both Vwf+/+ and Vwf-/- mice were infected with Plasmodium berghei ANKA (PbANKA) to induce ECM. Alterations of ...
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#1Senna Staessens (Katholieke Universiteit Leuven)H-Index: 2
#2Simon F. DeMeyer (Katholieke Universiteit Leuven)H-Index: 22
Last. Simon F. De Meyer (Katholieke Universiteit Leuven)H-Index: 24
view all 2 authors...
The structure of stroke thrombi has gained an increasing amount of interest in recent years. The advent of endovascular thrombectomy has offered the unique opportunity to provide and analyze thrombi removed from ischemic stroke patients. It has become clear that the composition of ischemic stroke thrombi is relatively heterogenous and various molecular and cellular patterns become apparent. Good understanding of the histopathologic characteristics of thrombi is important to lead future advanceme...
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#1An-Sofie Schelpe (Katholieke Universiteit Leuven)H-Index: 4
#2Anastasis Petri (Imperial College London)H-Index: 2
Last. Karen Vanhoorelbeke (Katholieke Universiteit Leuven)H-Index: 38
view all 8 authors...
Plasma ADAMTS13 circulates in a folded conformation that is stabilized by an interaction between the central Spacer domain and the C-terminal CUB (complement components C1r and C1s, sea urchin protein Uegf, and bone morphogenetic protein-1) domains. Binding of ADAMTS13 to the VWF D4(-CK) domains or to certain activating murine monoclonal antibodies (mAbs) induces a structural change that extends ADAMTS13 into an open conformation that enhances its function. The objective was to characterize the ...
2 CitationsSource
#1Marijke Peetermans (Katholieke Universiteit Leuven)H-Index: 13
#2Severien Meyers (Katholieke Universiteit Leuven)H-Index: 1
Last. Peter Verhamme (Katholieke Universiteit Leuven)H-Index: 44
view all 12 authors...
BACKGROUND: Previous clinical evidence correlates levels of von Willebrand factor (VWF) and its cleaving protease ADAMTS13 with outcome in septic patients. No previous studies addressed if VWF and ADAMTS13 affected the outcome of Staphylococcus aureus sepsis. OBJECTIVES: We studied the role of VWF and ADAMTS13 in S. aureus sepsis both in patients and in mice. METHODS: VWF levels and ADAMTS13 activity levels were measured in plasma samples from 89 S. aureus bacteremia patients by chemiluminescent...
1 CitationsSource
#1Frederik Denorme (Katholieke Universiteit Leuven)H-Index: 10
#2Kimberly Martinod (Katholieke Universiteit Leuven)H-Index: 23
Last. Simon F. DeMeyerH-Index: 22
view all 8 authors...
von Willebrand factor (VWF) plays an important role in ischemic stroke. However, the exact mechanism by which VWF mediates progression of ischemic stroke brain damage is not completely understood. Using flow cytometric analysis of single cell suspensions prepared from brain tissue and immunohistochemistry, we investigated the potential inflammatory mechanisms by which VWF contributes to ischemic stroke brain damage in a mouse model of cerebral ischemia/reperfusion injury. Twenty-four hours after...
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#1Senna Staessens (Katholieke Universiteit Leuven)H-Index: 1
#1Senna Staessens (Katholieke Universiteit Leuven)H-Index: 2
Last. Simon F. De Meyer (Katholieke Universiteit Leuven)H-Index: 24
view all 10 authors...
Ischemic stroke is caused by a thromboembolic occlusion of cerebral arteries. Treatment is focused on fast and efficient removal of the occluding thrombus, either via intravenous thrombolysis or via endovascular thrombectomy. Recanalization, however, is not always successful and factors contributing to failure are not completely understood. Although the occluding thrombus is the primary target of acute treatment, little is known about its internal organization and composition. The aim of this st...
14 CitationsSource
#1Charlotte Dekimpe (Katholieke Universiteit Leuven)H-Index: 2
#2Elien Roose (Katholieke Universiteit Leuven)H-Index: 7
Last. Hendrik B. Feys (UGent: Ghent University)H-Index: 21
view all 17 authors...
BACKGROUND: The biological diagnosis of immune-mediated thrombotic thrombocytopenic purpura (iTTP) is based on determination of ADAMTS13 activity (<10%) and anti-ADAMTS13 autoantibodies. ADAMTS13 antigen levels are not routinely measured in iTTP patients, but studies have shown that antigen levels are a valuable prognostic factor. OBJECTIVES: To (a) report the validation of our in-house developed ADAMTS13 antigen enzyme-linked immunosorbent assay (ELISA) and determine ADAMTS13 antigen in a large...
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#1Frederik Denorme (Katholieke Universiteit Leuven)H-Index: 10
#2Karen Vanhoorelbeke (Katholieke Universiteit Leuven)H-Index: 38
Last. Simon F. DeMeyerH-Index: 22
view all 3 authors...
Von Willebrand factor (VWF) and platelets are key mediators of normal hemostasis. At sites of vascular injury, VWF recruits platelets via binding to the platelet receptor glycoprotein Ib (GPIb). Over the past decades, it has become clear that many hemostatic factors, including VWF and platelets, are also involved in inflammatory processes, forming intriguing links between hemostasis, thrombosis and inflammation. The so-called ‘thrombo-inflammatory’ nature of the VWF-platelet axis becomes incre...
4 CitationsSource
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