title: Production and characterization of liquid-stored and lyophilized reconstituted human infusible platelet membranes.
abstract: BACKGROUND
  During recent years, the need for platelet concentrate (PC) has increased. Infusible platelet membranes (IPM) have been developed as an alternative to standard PCs, with the additional advantage of long shelf-life and increased viral safety. In this study, IPM construction and the morphological and biological features of these microvesicles were surveyed to determine their binding capacities in vitro.
  
  
  METHODS
  Thirty-five PC units prepared by the Iranian Blood Transfusion Organization were used to produce IPM. Platelets were lysed by repeated cycles of freezing and thawing, virally inactivated with wet heat in the presence of different concentrations of sodium octanoate as a heat stabilizer, and then sonicated. IPM were separated, kept at 4°C or lyophilized, and examined for binding to collagen and von Willebrand factor (VWF).
  
  
  RESULTS
  IPM retained the binding capacity for collagen and VWF, and the extent of VWF binding was dependent on the concentration of the heat stabilizer. Additionally, a higher binding capacity was demonstrated for liquid-stored compared with lyophilized IPM.
  
  
  CONCLUSIONS
  This study revealed the potential of IPM microvesicles to mimic the binding features of platelets in vitro.
authors.affiliation: Research Center, Iranian Blood Transfusion Organization, Tehran, Iran.
authors.forename: N
authors.initials: N
authors.lastname: Ahmadzadeh
authors.forename: F
authors.initials: F
authors.lastname: Yari
authors.forename: N
authors.initials: N
authors.lastname: Amirizadeh
authors.forename: M R
authors.initials: MR
authors.lastname: Khorramizadeh
mesh_terms: D001792:Blood Platelets / Q000378:metabolism* / Q000648:ultrastructure; D002210:Caprylates / Q000494:pharmacology; D002462:Cell Membrane / Q000378:metabolism* / Q000648:ultrastructure; D003080:Cold Temperature; D003094:Collagen / Q000378:metabolism*; D004305:Dose-Response Relationship, Drug; D005434:Flow Cytometry; D005612:Freeze Drying; D006358:Hot Temperature; D006801:Humans; D008855:Microscopy, Electron, Scanning; D010316:Particle Size; D017713:Platelet Transfusion / Q000379:methods; D011485:Protein Binding / Q000187:drug effects; D014841:von Willebrand Factor / Q000378:metabolism*
chemical_list: D002210:Caprylates; D014841:von Willebrand Factor; D003094:Collagen; C031492:octanoic acid