title: Evaluation of platelet function under high shear condition in the small-sized collagen bead column.
abstract: We previously reported that platelet retention rates as measured with collagen-coated bead columns (the conventional column) reflect the processes of platelet adhesion and aggregation under low shear stress, and that this system could serve as an easy-to-use platelet aggregometry. With this column, platelet glycoprotein (GP) VI and GPIIb/IIIa, but not the GPIb-von Willebrand factor (VWF) interaction, play major roles in platelet activation. To develop a system that can better reflect the GPIb-VWF interaction under high shear stress, we designed a column containing small-sized beads (125-212 microm) coated with porcine collagen type I. As expected, the GPIb-VWF interaction played a crucial role in platelet retention rates at higher flow rates. Adenosine 5'-diphosphate, but not thromboxane A2, appears to support platelet activation in this system. The platelet retention rates among healthy individuals with the new columns are in the range wider than the conventional columns, and this diversity could be attributed to the broad range of the VWF antigen and/or its activity. It is suggested that this new column can serve as an easy-to-use method for evaluating the VWF antigen levels and its activity and for monitoring patients with thrombotic or bleeding disorders related to the VWF-GPIb interaction.
authors.affiliation: Department of Clinical and Laboratory Medicine, Faculty of Medicine, University of Yamanashi, Shimokato, Tamaho, Nakakoma, Yamanashi, Japan.
authors.forename: Makoto
authors.initials: M
authors.lastname: Kaneko
authors.forename: Toshiro
authors.initials: T
authors.lastname: Takafuta
authors.forename: Olga
authors.initials: O
authors.lastname: Cuyun-Lira
authors.forename: Kaneo
authors.initials: K
authors.lastname: Satoh
authors.forename: Morio
authors.initials: M
authors.lastname: Arai
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Yatomi
authors.forename: Yukio
authors.initials: Y
authors.lastname: Ozaki
mesh_terms: D000906:Antibodies; D001777:Blood Coagulation / Q000502:physiology*; D001792:Blood Platelets / Q000502:physiology*; D002845:Chromatography / Q000379:methods; D003094:Collagen; D006801:Humans; D015539:Platelet Activation / Q000502:physiology*; D010974:Platelet Aggregation; D010979:Platelet Function Tests / Q000295:instrumentation*; D019039:Platelet Glycoprotein GPIIb-IIIa Complex / Q000502:physiology; D019038:Platelet Glycoprotein GPIb-IX Complex / Q000502:physiology; D012212:Rheology; D012310:Ristocetin; D033081:Shear Strength; D014841:von Willebrand Factor / Q000502:physiology
chemical_list: D000906:Antibodies; D019039:Platelet Glycoprotein GPIIb-IIIa Complex; D019038:Platelet Glycoprotein GPIb-IX Complex; D014841:von Willebrand Factor; D012310:Ristocetin; D003094:Collagen