title: C5a receptor modulation on neutrophils and monocytes from chronic hemodialysis and peritoneal dialysis patients.
abstract: Chronic renal failure patients have an increased risk for infection which may partially be due to altered chemotactic ability of their white blood cells. This study was designed to evaluate chemotactic factor and Fc receptor expression on neutrophils (PMN) and monocytes from chronic renal failure patients on hemodialysis (HD) or continuous ambulatory peritoneal dialysis (CAPD). Analysis of these receptors was performed using flow cytometry and fluorescent chemotactic factors (C5a, f-Met-Leu-Phe-Lys [fMLPL] and casein) and heat-aggregated human IgG. Peripheral blood PMN and monocytes obtained from 14 HD patients (in the predialysis period) and 14 CAPD patients were analyzed for their ability to bind each of the fluoresceinated ligands. PMN and monocytes from both patient groups had a significant reduction in their ability to bind C5a. The average percentage (+/- s.e.m.) of PMN that bound C5a was 93.9 +/- 1.1 for the controls, 72.9 +/- 3.8 for HD patients, and 79.3 +/- 4.0 for CAPD patients. Similar results were obtained with monocytes with 69.7 +/- 1.9% for controls, 54.6 +/- 4.5% for HD patients, and 31.0 +/- 4.5% for CAPD patients. These differences in C5a binding were also reflected in the average intensity of fluorescence. There was no significant difference in the percentage or fluorescence intensity of PMN or monocytes that bound casein or aggregated IgG when either group of dialysis patients was compared to the control values. Binding of fMLPL by PMN and monocytes from the HD patients and PMN from the CAPD patients were similar to control values but the binding of fMLPL by monocytes from CAPD patients was significantly suppressed (p less than 0.03).(ABSTRACT TRUNCATED AT 250 WORDS)
mesh_terms: D003176:Complement C3 / Q000032:analysis; D015926:Complement C3a; D003182:Complement C5 / Q000378:metabolism*; D015936:Complement C5a; D005434:Flow Cytometry; D006801:Humans; D007074:Immunoglobulin G / Q000378:metabolism; D007676:Kidney Failure, Chronic / Q000097:blood / Q000276:immunology; D009000:Monocytes / Q000276:immunology*; D009240:N-Formylmethionine Leucyl-Phenylalanine / Q000031:analogs & derivatives / Q000378:metabolism; D009504:Neutrophils / Q000276:immunology*; D010531:Peritoneal Dialysis, Continuous Ambulatory; D011951:Receptors, Complement / Q000378:metabolism*; D006435:Renal Dialysis
chemical_list: D003176:Complement C3; D003182:Complement C5; D007074:Immunoglobulin G; D011951:Receptors, Complement; D009240:N-Formylmethionine Leucyl-Phenylalanine; D015926:Complement C3a; D015936:Complement C5a; C049813:N-formylmethionyl-leucyl-phenylalanyl-lysine