title: Distinct and concerted functions of von Willebrand factor and fibrinogen in mural thrombus growth under high shear flow.
abstract: Using a perfusion chamber and confocal laser scanning microscopy, we analyzed the interplay of von Willebrand factor (VWF) and fibrinogen during thrombus growth on a collagen surface under physiologic high shear rate conditions. During initial thrombogenesis, platelet thrombi were constructed totally by VWF, not by fibrinogen. Fibrinogen accumulated predominantly inside the growing thrombi as a function of time, whereas the thrombus surfaces directly exposed to flow were occupied constantly by VWF throughout the observation period. In perfusion of afibrinogenemia (AF) blood lacking both plasma and platelet fibrinogen, the final height and volume of thrombi were significantly reduced compared with controls, albeit the area of surface coverage was normal. The impaired thrombus growth in AF was only partially corrected by the addition of purified fibrinogen to AF blood, whereas the addition of purified VWF to blood of severe von Willebrand disease (VWD) completely normalized the defective thrombus growth in this disease. Thus, the initial 2-dimensional thrombus expansion involves only VWF, whereas the time-dependent accumulation of fibrinogen, released from activated platelets, acts as a core adhesive ligand, increasing thrombus strength and height and resulting in 3-dimensional thrombus development against rapid blood flow.
authors.affiliation: Department of Pediatrics, Nara Medical University, Kashihara, Nara, Japan.
authors.forename: Hideto
authors.initials: H
authors.lastname: Matsui
authors.forename: Mitsuhiko
authors.initials: M
authors.lastname: Sugimoto
authors.forename: Tomohiro
authors.initials: T
authors.lastname: Mizuno
authors.forename: Shizuko
authors.initials: S
authors.lastname: Tsuji
authors.forename: Shigeki
authors.initials: S
authors.lastname: Miyata
authors.forename: Michio
authors.initials: M
authors.lastname: Matsuda
authors.forename: Akira
authors.initials: A
authors.lastname: Yoshioka
mesh_terms: D000347:Afibrinogenemia / Q000097:blood; D016022:Case-Control Studies; D003094:Collagen; D005340:Fibrinogen / Q000378:metabolism / Q000502:physiology*; D006331:Heart Diseases / Q000209:etiology* / Q000378:metabolism; D006801:Humans; D007700:Kinetics; D018715:Microscopy, Video; D010477:Perfusion; D010973:Platelet Adhesiveness; D013314:Stress, Mechanical; D013927:Thrombosis / Q000209:etiology* / Q000378:metabolism; D014842:von Willebrand Diseases / Q000097:blood; D014841:von Willebrand Factor / Q000378:metabolism / Q000502:physiology*
chemical_list: D014841:von Willebrand Factor; D005340:Fibrinogen; D003094:Collagen