Von Willebrand factor regulates complement on endothelial cells.

Abstract:

:Atypical hemolytic uremic syndrome and thrombotic thrombocytopenic purpura have traditionally been considered separate entities. Defects in the regulation of the complement alternative pathway occur in atypical hemolytic uremic syndrome, and defects in the cleavage of von Willebrand factor (VWF)-multimers arise in thrombotic thrombocytopenic purpura. However, recent studies suggest that both entities are related as defects in the disease-causing pathways overlap or show functional interactions. Here we investigate the possible functional link of VWF-multimers and the complement system on endothelial cells. Blood outgrowth endothelial cells (BOECs) were obtained from 3 healthy individuals and 2 patients with Type 3 von Willebrand disease lacking VWF. Cells were exposed to a standardized complement challenge via the combination of classical and alternative pathway activation and 50% normal human serum resulting in complement fixation to the endothelial surface. Under these conditions we found the expected release of VWF-multimers causing platelet adhesion onto BOECs from healthy individuals. Importantly, in BOECs derived from patients with von Willebrand disease complement C3c deposition and cytotoxicity were more pronounced than on BOECs derived from normal individuals. This is of particular importance as primary glomerular endothelial cells display a heterogeneous expression pattern of VWF with overall reduced VWF abundance. Thus, our results support a mechanistic link between VWF-multimers and the complement system. However, our findings also identify VWF as a new complement regulator on vascular endothelial cells and suggest that VWF has a protective effect on endothelial cells and complement-mediated injury.

journal_name

Kidney Int

journal_title

Kidney international

authors

Noone DG,Riedl M,Pluthero FG,Bowman ML,Liszewski MK,Lu L,Quan Y,Balgobin S,Schneppenheim R,Schneppenheim S,Budde U,James P,Atkinson JP,Palaniyar N,Kahr WH,Licht C

doi

10.1016/j.kint.2016.03.023

subject

Has Abstract

pub_date

2016-07-01 00:00:00

pages

123-34

issue

1

eissn

0085-2538

issn

1523-1755

pii

S0085-2538(16)30077-1

journal_volume

90

pub_type

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