The Effect of Dialysis Modality and Membrane Performance on Native Immunity in Dialysis Patients

Area of Science:

• Nephrology
• Immunology
• Biocompatibility

Background:

• Chronic Kidney Disease (CKD) is associated with immune dysregulation, including chronic inflammation and immune deficiency.
• Natural Killer (NK) cell function and number can be affected by dialysis membrane biocompatibility.
• Understanding the impact of dialysis modality and membrane type on innate immunity is crucial for patient care.

Purpose of the Study:

• To investigate the effect of different dialysis modalities and membrane types on NK-cell count and neutrophil phagocytic activity in CKD patients.
• To compare the immune status of patients undergoing conventional hemodialysis (low and high flux) versus on-line hemodiafiltration.
• To explore potential correlations between immune cell function and clinical parameters like parathyroid hormone levels.

Main Methods:

• Sixty CKD patients were divided into three groups: conventional low-flux hemodialysis (cHD-LF), conventional high-flux hemodialysis (cHD-HF), and on-line hemodiafiltration (on-line HDF).
• NK-cell counts and neutrophil phagocytic activity were measured in all patient groups and compared to healthy controls.
• Statistical analyses were performed to assess differences between groups and correlations with parathyroid hormone levels.

Main Results:

• NK-cell counts were significantly lower in all dialysis groups compared to healthy subjects (p<0.001).
• No significant differences in NK-cell counts were found among the different dialysis modalities or membrane types.
• Neutrophil phagocytic activity was significantly decreased in all dialysis patients (p<0.001), with no differences related to dialysis method or membrane.
• A significant positive correlation was observed between parathyroid hormone levels and NK-cell count (r=0.305, p<0.01).

Conclusions:

• Dialysis patients exhibit impaired innate immunity, characterized by reduced NK-cell numbers and neutrophil phagocytic activity.
• Neither dialysis modality nor membrane type significantly influences the measured innate immune parameters in CKD patients.
• Parathyroid hormone levels may play a role in the immune system disturbances observed in dialysis patients.