title: Effect of daily hemodialysis on monocytes apoptosis.
abstract: Uremia is associated with a state of immune dysfunction with increased susceptibility to infection and malignancy possibly related to dysregulation of immune system cell apoptosis. Peritoneal dialysis can restore plasma apoptosis activity on monocytes compared to intermittent hemodialysis. Whether the continuous modality or diverse clearance mechanisms involved are responsible is unknown. Apoptosis rates correlate with phagocytic function highlighting the benefit of efficient toxin clearance. The plasma of 16 patients on daily hemodialysis (D-HD) was incubated with U937 monocytes and compared to 18 hemodialysis (HD) patients, 5 chronic renal failure (CRF) subjects and 5 healthy volunteers (controls). Apoptosis was evaluated by immunofluorescence microscopy dyes (Hoechst 33342, propidium iodide) and annexin V cytoflowmetry at 96 h. Plasma-induced U937 apoptosis (mean values) was significantly enhanced in D-HD (18.8 +/- 4.1), HD (19.67 +/- 5.5) and CRF patients (20.8 +/- 4.7) compared to controls (9.6 +/- 3.6; p < 0.05 for CRF vs. controls, HD vs. controls and D-HD vs. controls). No significant differences were observed between D-HD, HD and CRF sera on apoptosis rate, caspase-3 activity and phagocytic capacity of U937 monocytes. This study demonstrates that the plasma of various HD schedules was unable to reduce monocyte apoptosis induced by uremia.
authors.affiliation: Department of Nephrology, G. Hatzikosta Hospital, Ioannina, Greece.
authors.forename: Emilio
authors.initials: E
authors.lastname: Andrikos
authors.forename: Emanuela
authors.initials: E
authors.lastname: Buoncristiani
authors.forename: Vincenzo
authors.initials: V
authors.lastname: D'Intini
authors.forename: Valeria
authors.initials: V
authors.lastname: Bordoni
authors.forename: Monica
authors.initials: M
authors.lastname: Bonello
authors.forename: Nathan
authors.initials: N
authors.lastname: Levin
authors.forename: Umberto
authors.initials: U
authors.lastname: Buoncristiani
authors.forename: Michail
authors.initials: M
authors.lastname: Pappas
authors.forename: Claudio
authors.initials: C
authors.lastname: Ronco
mesh_terms: D000328:Adult; D017209:Apoptosis / Q000502:physiology*; D053148:Caspase 3; D020169:Caspases / Q000378:metabolism; D002478:Cells, Cultured; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009000:Monocytes / Q000473:pathology* / Q000502:physiology; D010530:Peritoneal Dialysis / Q000379:methods; D010949:Plasma / Q000378:metabolism; D006435:Renal Dialysis / Q000379:methods*; D020298:U937 Cells
chemical_list: C505407:CASP3 protein, human; D053148:Caspase 3; D020169:Caspases