Renal Failure and Esterase-Negative Monocytes

Abstract

Monocyte esterase deficiency (MED) has been found to be linked with autoimmune (1,2) and lymphoproliferative (2,3) disease. The incidence of MED where >85% of peripheral blood monocytes are consistently negative in the cytochemical stain for monocyte esterase activity, was shown to be significantly raised in patients with renal failure (3.8%) as compared to the incidence in normal blood donors (0.8%) in a survey performed at the Belfast City Hospital in 1987 (2). The overall occurrence of any proportion of esterasenegative monocytes (ENMs) in patients with renal disease has not been previously studied. The aims of this study were to document this occurrence, and by examining the clinical and biochemical parameters associated with ENMs to identify possible reasons for their occurrence. The original survey data were reexamined and further information previously unreported regarding the occurrence of ENMs was extracted from the renal patient cohort data. Clinical and biochemical data were obtained from the hospital notes of the renal patients and associations sought between these parameters and the occurrence of ENMs. ENMs occurred in a significantly higher proportion (31%) of the renal patients than in the normal population (8%; p < 0.001 chi-sq.) or any other hospital population. A highly significant association between rising serum phosphate levels and increasing proportions of ENMs was identified (p <. 001) and this association proved to be independent of serum creatinine levels and renal dialysis status. There is a marked increase in occurrence of esterase-negative monocytes in patients with renal failure. This increase was not caused by the degree of renal failure as reflected by serum creatinine levels, nor by renal transplantation or immunosuppressive therapy. A significant association between rising serum phosphate and increasing proportion of esterase-negative monocytes was identified. This new information, when considered with the previously described experimental and epidemiological evidence for malfunction of esterase negative monocytes, identifies a phenomenon which may contribute to the immunological difficulties of patients with chronic renal failure.