title: Platelets do not adsorb HLA class I molecules during storage of pooled platelet concentrates.
abstract: The origin of HLA class I molecules on platelets is still under discussion. Adsorption of HLA molecules on platelets using specific experimental conditions has been described. The study presented investigates whether there is a significant elution and adsorption of HLA class I molecules on platelets during storage of pooled random platelet concentrates (PRPC) under routine conditions. Platelet concentrates (PCs) from whole blood were prepared from HLA-A2-positive and HLA-A2-negative donors, pooled and stored under routine conditions. In addition, platelets from HLA-A2-negative donors were pelleted and resuspended in cell-free plasma from HLA-A2-positive donors. HLA-A2-positive PCs (positive control), HLA-A2-negative PCs (negative control) and HLA-A2-negative platelets in plasma from HLA-A2-negative donors were stored simultaneously. Binding of FITC-conjugated monoclonal murine antihuman HLA-A2 antibodies (anti-HLA-A2-mab) was measured during 5-day storage by flow cytometry. An increased binding of anti-HLA-A2-mab during storage was found on HLA-A2-negative platelets (P < 0.005) independently whether they were incubated with cell-free plasma or platelets from HLA-A2-positive donors or autologous HLA-A2-negative cell-free plasma. However, non-specific binding of IgG controls increased equally, whereas anti-HLA-A2-mab binding to platelets from HLA-A2-positive donors did not decrease during storage. This study suggests that there is no significant elution and adsorption of HLA class I antigens of platelets in pooled PCs during storage under the usual conditions for platelet storage. Increased anti-HLA-A2-mab signal was due to non-specific binding. Therefore, HLA class I compatible platelets should maintain their compatibility for an immunized patient when stored in a pool with HLA incompatible platelets and shortened survival after transfusion should not be expected.
authors.affiliation: Institute for Transfusion Medicine and Hemostaseology, University Clinics, Philipps-University, Marburg, Germany. zeiler@mailer.uni-marburg.de
authors.forename: T
authors.initials: T
authors.lastname: Zeiler
authors.forename: M
authors.initials: M
authors.lastname: Heim
authors.forename: A
authors.initials: A
authors.lastname: Dempfle
authors.forename: V
authors.initials: V
authors.lastname: Kretschmer
mesh_terms: D000327:Adsorption; D000911:Antibodies, Monoclonal; D000918:Antibody Specificity; D001792:Blood Platelets / Q000378:metabolism*; D001793:Blood Preservation; D005434:Flow Cytometry; D015789:HLA-A2 Antigen / Q000378:metabolism; D015395:Histocompatibility Antigens Class I / Q000378:metabolism*; D006801:Humans; D017713:Platelet Transfusion / Q000592:standards*
chemical_list: D000911:Antibodies, Monoclonal; D015789:HLA-A2 Antigen; D015395:Histocompatibility Antigens Class I