Abstract
The incidence of pure red cell aplasia (PRCA) in patients with chronic kidney disease associated with the subcutaneous (s.c.) administration of epoetin alfa (EPREX) began to increase in 1998. As part of an intensive investigation into the reasons for this increase, in vivo models were developed to assess the ability of potential causative factors to stimulate an immune response to recombinant human erythropoietin (rHuEPO). It was difficult to generate anti-EPO antibodies in mice. In animals injected with rHuEPO alone, anti-EPO antibodies were either absent or present at very low levels. The addition of an adjuvant to the immunization protocol was able to increase both the frequency of occurrence and titer of the immune response and resulted in the generation of anti-EPO antibodies that, in most cases, recognized both human and mouse EPO. Some mice exhibited a reduction in hematocrit, suggesting neutralization of endogenous EPO by anti-EPO antibodies. To evaluate the primary lead identified in the technical investigation, leachates from the uncoated syringe stoppers of EPREX syringes, a surrogate antigen (chicken egg albumin, OVA) was used to avoid possible interferences that could arise from the use of an endogenous protein lik...Continue Reading
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