Allosensitization of islet allograft recipients.
نویسندگان
چکیده
BACKGROUND The immune monitoring of islet transplant recipients includes the assessment of panel reactive antibodies (PRA). A negative association of PRA+ with allogeneic solid organ graft survival has been recognized, but scattered data is available for islet transplantation. METHODS We performed a retrospective analysis of PRA status in 66 patients with type 1 diabetes mellitus recipient of islet allografts between 1985 and 2006. RESULTS Pretransplant PRA+ was observed in 10 subjects in the old trials and associated with kidney transplantation and/or pregnancies. Thirteen subjects displayed PRA+ at follow-up, eight of whom were de novo. Overall, PRA+ did not correlate with islet graft outcome: long-term graft survival was observed in the presence of basal or persistent PRA+ and graft dysfunction occurred also in the absence of PRA+. Loss of graft function was associated with PRA+ after lowering of immunosuppression or after infection episodes. Loss of C-peptide did not affect kidney graft function even in simultaneous islet-kidney transplant recipients. Mostly, PRA remained negative under adequate immunosuppression. Patients whose immunosuppression was discontinued invariably developed PRA+. CONCLUSIONS Monitoring of PRA under immunosuppression may have little clinical value under adequate immunosuppression in islet transplant recipients. The implications of allosensitization after discontinuation of immunosuppression need to be evaluated to define the real clinical impact in this patient population.
منابع مشابه
Treatment with Anti-FcεRIα (MAR-1) Antibody Prevents Acute Islet Allograft Rejection in a Murine Model.
OBJECTIVE Various immunological strategies for tolerance induction against allogeneic tissue grafts (allografts) have been tested in islet transplant recipients; for example, T cell activating co-stimulatory pathway blockade has been shown to prolong islet allograft survival. However, little is known about whether infiltrating inflammatory cells (e.g., basophils) affect islet allograft fates be...
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ورودعنوان ژورنال:
- Transplantation
دوره 84 11 شماره
صفحات -
تاریخ انتشار 2007