Abstract
Abstract Rapamycin is a new immunosuppressive agent approved for maintenance therapy after kidney transplantation. It may allow calcineurin-inhibitor-free, nonnephrotoxic immunosuppression. We report, however, on four kidneytransplant recipients who developed post-transplantation glomerulonephritis after conversion from a calcineurin-inhibitor-based immunosuppression to rapamycin. In all four patients nephrotic-range proteinuria occurred 2–9 months after conversion to rapamycin. Renal biopsy confirmed membrano-proliferative glomerulonephritis type 1 in one case, membranous glomerulonephritis in another and IgA-nephropathy in two cases, respectively. Calcineurin-inhibitorbased immunosuppression was reintroduced and resulted in complete remission of proteinuria and in stabilised renal function in all patients. We conclude that in the case of rapamycin-associated post-transplantation glomerulonephritis an attempt should be made to replace rapamycin by a calcineurin inhibitor.
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