Abstract
The influence of presensitization (blood transfusions) on B-cell immunity as reflected in the serum of two groups of candidates for cadaveric donor renal allografts was examined. The first group initially had a high level of panel-reactive antibody (PRA) greater than 72% but experienced a large decrease in PRA (>70%) 6–34 months prior to transplantation. In contrast, the second group maintained a high PRA (100%) for up to 28 months after sensitization and before transplantation. Three blood samples from each patient, representing a maximum time span of 34 months, were analyzed. Levels of IgG, IgM isohemagglutinins, and antitetanus antibody were used as indicators of B-cell function. There were no significant differences between the individual values of a single patient with regard to each parameter. However, Group II patients had elevated values of total IgG relative to Group I patients. Total serum IgG-subclass levels (IgG1, IgG2, IgG3, IgG4) were measured and the relationship between a specific IgG subclass and the PRA activity was determined. IgG1 values in Group II were higher than those found for Group I. The other IgG subclasses were all within normal levels and were not significantly different between Group I and Group II. When IgG-subclass typing of PRA was performed, IgG1 accounted for most of the activity in both groups and a fall in PRA-specific IgG1 was associated with the reduced PRA observed in Group I. The data indicate that humoral immunity, as reflected by total and specific immunoglobulin levels, is intact in general in the two groups of presensitized renal allograft candidates examined and that any loss of PRA activity reflects a reduction in a specific immune response.
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Monos, D.S., Prystowsky, M.B., Levinson, A.I. et al. Evaluation of B-cell immunity in patients with pretransplant sensitization. J Clin Immunol 8, 200–206 (1988). https://doi.org/10.1007/BF00917567
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DOI: https://doi.org/10.1007/BF00917567