title: Impact of transfusions and acute rejection on posttransplantation donor antigen-specific responses in two study populations. Cooperative Clinical Trial in Transplantation Research Group.
abstract: BACKGROUND
  We participated in a protocol supported by the National Institutes of Allergy and Infectious Disease, Cooperative Clinical Trial in Transplantation (CCTT), which was designed to investigate the effect of peritransplant donor-specific transfusion in non-HLA-identical living donor kidney recipients.
  
  
  METHODS
  We determined the donor antigen-specific responses at 1 year after transplantation for the 79 CCTT donor-recipient combinations in this study. A lower rate of donor antigen-specific hyporeactivity was seen in the CCTT recipients (6 of 79=8%) versus our recipients at the University of Minnesota who underwent transplantation in the same period (9 of 55=16%, P=0.16) and versus our combined historical data (33 of 131=25%, P=0.002). Therefore, we studied the differences in the two recipient populations to determine why hyporeactivity was lower in the CCTT group than at our center.
  
  
  RESULTS
  Significant differences were seen in the acute rejection rates and the frequency of pretransplantation random transfusion. Overall and early (<3 month) acute rejection rates were higher in CCTT versus Minnesota recipients (overall: 51% vs. 20%, P=0.001) (early: 43% vs. 16%, P=0.001). The frequency of pretransplantation random transfusion was 40% for CCTT recipients (34%) versus 80% for Minnesota recipients (75%) (P=0.0004).
  
  
  CONCLUSIONS
  These results provide provocative, although not conclusive, evidence for the importance of pretransplantation transfusion and acute rejection episodes in the development of donor antigen-specific hyporeactivity. Pre-, peri-, and posttransplantation clinical events undoubtedly have an impact on posttransplantation immune parameters.
authors: Department of Surgery, University of Minnesota, Minneapolis, USA.
authors: N L
authors: NL
authors: Reinsmoen
authors: A J
authors: AJ
authors: Matas
authors: L
authors: L
authors: Donaldson
authors: S
authors: S
authors: Carter
mesh_terms: D001379:Azathioprine / Q000627:therapeutic use; D001803:Blood Transfusion; D016572:Cyclosporine / Q000627:therapeutic use; D006084:Graft Rejection / Q000276:immunology*; D006680:HLA Antigens / Q000276:immunology*; D006801:Humans; D007166:Immunosuppressive Agents / Q000627:therapeutic use; D016030:Kidney Transplantation / Q000276:immunology*; D011241:Prednisone / Q000627:therapeutic use; D014019:Tissue Donors
chemical_list: D006680:HLA Antigens; D007166:Immunosuppressive Agents; D016572:Cyclosporine; D001379:Azathioprine; D011241:Prednisone