title: Von Willebrand factor availability in platelet concentrates stored for 5 days.
abstract: Von Willebrand factor (vWF) availability was assessed in platelet concentrates (PCs). After 5 days of storage, 82 +/- 9% of basal levels of ristocetin cofactor activity (vWF:RCo) remained in PCs. vWF antigen (vWF:Ag) increased up to 166 +/- 38% (P < 0.05) in the same period. Autoradiograph pattern of vW:Ag showed an increase in low molecular weight multimers, and fast migrating multimeric forms were visualized by crossed immunoelectrophoresis on day 5. Studies carried out in platelet free plasma stored as PCs showed similar changes in vWF:RCo but increments in vWF:Ag were not detected. These data indicate that PCs maintain vWF:RCo levels of clinical value even after 5 days of storage and suggest that vWF comes out from platelets to plasma during storage.
authors.affiliation: Servicio de Hematología, Hospital Ramón y Cajal, Madrid, Spain.
authors.forename: J M
authors.initials: JM
authors.lastname: Cesar
authors.forename: A
authors.initials: A
authors.lastname: García-Avello
authors.forename: J
authors.initials: J
authors.lastname: Monteagudo
authors.forename: J I
authors.initials: JI
authors.lastname: Espinosa
authors.forename: J C
authors.initials: JC
authors.lastname: Lodos
authors.forename: R
authors.initials: R
authors.lastname: Castillo
authors.forename: J L
authors.initials: JL
authors.lastname: Navarro
mesh_terms: D001792:Blood Platelets / Q000737:chemistry; D001793:Blood Preservation; D006801:Humans; D013997:Time Factors; D014841:von Willebrand Factor / Q000032:analysis*
chemical_list: D014841:von Willebrand Factor