The effects of uremic serum on the in vitro growth of normal BFU-E and on the burst-promoting activity by normal T-lymphocytes were evaluated separately. The effect of hemodialysis on the removal of possible serum inhibitor(s) was also tested. Sera of 12 uremic patients were shown to provoke a 60% inhibition of the in vitro growth of normal BFU-E and almost complete abolition of burst-promoting activity by T lymphocytes. While hemodialysis significantly removed the inhibition of uremic sera on BFU-E growth, it was rather ineffective in removing the inhibitor(s) of T lymphocytes. The different effects of uremic serum on BFU-E and on T lymphocytes are discussed.
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