Abstract
Sera of human recipients of kidney allografts and rabbit recipients of skin allografts were tested by means of enzyme immunoassays (EIA) for IgG rheumatoid factor (RF) combining with human IgG (RF-H) or rabbit IgG (RF-R). In humans, the mean OD value in EIA for RF-H was significantly higher in 185 sera of allograft recipients than in 46 pretransplantation sera and 100 sera of normal subjects. Furthermore, the mean OD in patients who rejected their grafts was higher than in patients with satisfactory graft function. Interestingly, there was no difference in OD values for RF-R between sera of graft recipients and sera of normal subjects. Of 52 rabbit recipients of skin allografts, 24 were positive for both RF-R and RF-H, 4 were positive only for RF-R, another 4 only for RF-H, and 20 were negative for both. Renal allografts originating from the previous donors of skin grafts resulted, in most instances, in a significant decrease in the strength of the reaction for both RF-R and RF-H. The possible role of graft rejection in stimulation of RF formation as well as the possible role of RF in graft rejection should be considered.
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