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We investigated the natural killer (NK) cell activity of peripheral blood mononuclear cells (PBMC) and the suppressive factor of NK cell activity in patients on maintenance hemodialysis (HD). NK cell activity was significantly lower in patients on HD than in healthy controls (20.2 +/- 16.5 vs. 31.0 +/- 13.2%, p less than 0.01). There was no difference in NK cell activity between patients treated with cuprophane and high-permeability membrane. NK cells from patients on HD showed a poor response to interleukin-2, and uremic sera significantly suppressed NK cell activity of normal PBMC. Although urea, creatinine, methylguanidine or guanidinosuccinic acid alone did not suppress the NK cell activity of normal PBMC, the guanidino compound did so significantly. It is suggested that defective NK cell activity in uremic patients explains in part their susceptibility to malignancy and infection. The immunosuppressive effect may be exhibited by synergism or mosaic of uremic toxins.
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