Inability of dendritic cells to prevent the blood transfusion effect in a mouse cardiac allograft model - PubMed (original) (raw)
Inability of dendritic cells to prevent the blood transfusion effect in a mouse cardiac allograft model
W N Peugh et al. Transplantation. 1987 Nov.
Abstract
The beneficial effect of blood transfusions before clinical renal transplantation is well established, but this can result in sensitization of some potential first graft recipients. Dendritic cells (DC), present in human blood, are potent stimulators of immune responses in vitro and in vivo, and in different systems they can overcome immune unresponsiveness. We therefore investigated whether DC could prevent the transfusion effect in a murine cardiac allograft model. C57BL/10 (C57) hearts were normally rejected by untreated DBA/2 recipients with a median survival time (MST) of 17 days. Long-term survival (MST greater than 100 days) was induced when the recipients were transfused with C57 blood 14 days before transplantation (d-14). Similar survival times were obtained when up to 1.5 x 10(5) splenic DC were added to the transfused blood. This number of DC or as few as 10(3), in "unsorted" preparations that were 70-85% pure, similarly enhanced when transfused alone at d-14. This enhancement was probably due to the contaminating cells rather than the DC since 10(3) lymphocytes prolonged survival, but an equivalent dose of "sorted" DC (ca. 93% pure, most contaminating cells being removed by sorting on an Ortho Cytofluorograf) did not. Transfusion of unsorted preparations containing 1.5 x 10(5) DC at d-3 led to accelerated graft rejection (MST 4 days). This sensitization was most likely due to the DC because equivalent numbers of lymphocytes were ineffective. Nevertheless, if a blood transfusion was given at d-14 followed by a normally sensitizing dose of DC at d-3, graft survival was still prolonged. Thus in no case were DC able to prevent the blood transfusion effect in this strain combination. Furthermore, DC of donor origin given to DBA/2 recipients with long-surviving C57 hearts, produced by prior blood transfusion, did not trigger rejection of the hearts.
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