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2016 ; 6
(ä): 32473
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Weibel-Palade body size modulates the adhesive activity of its von Willebrand
Factor cargo in cultured endothelial cells
#MMPMID27576551
Ferraro F
; Mafalda Lopes da S
; Grimes W
; Lee HK
; Ketteler R
; Kriston-Vizi J
; Cutler DF
Sci Rep
2016[Aug]; 6
(ä): 32473
PMID27576551
show ga
Changes in the size of cellular organelles are often linked to modifications in
their function. Endothelial cells store von Willebrand Factor (vWF), a
glycoprotein essential to haemostasis in Weibel-Palade bodies (WPBs),
cigar-shaped secretory granules that are generated in a wide range of sizes. We
recently showed that forcing changes in the size of WPBs modifies the activity of
this cargo. We now find that endothelial cells treated with statins produce
shorter WPBs and that the vWF they release at exocytosis displays a reduced
capability to recruit platelets to the endothelial cell surface. Investigating
other functional consequences of size changes of WPBs, we also report that the
endothelial surface-associated vWF formed at exocytosis recruits soluble plasma
vWF and that this process is reduced by treatments that shorten WPBs, statins
included. These results indicate that the post-exocytic adhesive activity of vWF
towards platelets and plasma vWF at the endothelial surface reflects the size of
their storage organelle. Our findings therefore show that changes in WPB size, by
influencing the adhesive activity of its vWF cargo, may represent a novel mode of
regulation of platelet aggregation at the vascular wall.