Functional architecture of Weibel-Palade bodies.
Weibel-Palade bodies (WPBs) are elongated secretory organelles specific to endothelial cells that contain von Willebrand factor (VWF) and a variety of other proteins that contribute to inflammation, angiogenesis, and tissue repair. The remarkable architecture of WPBs is because of the unique properties of their major constituent VWF. VWF is stored inside WPBs as tubules, but on its release, forms strikingly long strings that arrest bleeding by recruiting blood platelets to sites of vascular injury. In recent years considerable progress has been made regarding the molecular events that underlie the packaging of VWF multimers into tubules and the processes leading to the formation of elongated WPBs. Mechanisms directing the conversion of tightly packaged VWF tubules into VWF strings on the surface of endothelial cells are starting to be unraveled. Several modes of exocytosis have now been described for WPBs, emphasizing the plasticity of these organelles. WPB exocytosis plays a role in the pathophysiology and treatment of von Willebrand disease and may have impact on common hematologic and cardiovascular disorders. This review summarizes the major advances made on the biogenesis and exocytosis of WPBs and places these recent discoveries in the context of von Willebrand disease.
Department of Molecular Cell Biology, Section Electron Microscopy, Leiden University Medical Center, Leiden, The Netherlands.
Karine M
KM
Valentijn
J Evan
JE
Sadler
Jack A
JA
Valentijn
Jan
J
Voorberg
Jeroen
J
Eikenboom
D000818:Animals; D042783:Endothelial Cells / Q000648:ultrastructure; D005089:Exocytosis / Q000502:physiology; D006801:Humans; D020302:Weibel-Palade Bodies / Q000378:metabolism* / Q000648:ultrastructure*; D014842:von Willebrand Diseases / Q000378:metabolism; D014841:von Willebrand Factor / Q000378:metabolism*
D014841:von Willebrand Factor
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