Consequences of Prior Alloimmunization during Granulocyte Transfusion

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Abstract
The transfusion of leukocyte-containing blood products can lead to the production of antibodies to antigens on the surface of leukocytes. Such antibodies can be detected by a variety of techniques including assays for lymphocytotoxicity, granulocytotoxicity and leukoagglutination. To evaluate the effect of preformed anti-leukocyte antibodies during granulocyte transfusion therapy, recipient beagles were sensitized to donor foxhound antigens. After being made granulocytopenic with cyclophosphamide, these animals were transfused with a set dose of granulocytes collected by continuous flow centrifugation. When compared to the results of similar transfusions to nonsensitized recipients, granulocyte transfusions to animals with preformed anti-leukocyte antibodies resulted in lower 1 h posttransfusion leukocyte increments (P < .04) and in less migration of neutrophils through a skin abrasion into a chamber containing a strong chemoattractant, autologous serum (P < .0001). Profound thrombocytopenia was found in sensitized animals, but not in nonsensitized recipients, 1 h after the granulocyte transfusion.