Adsorption as a Contributor for Inflammatory Mediators Removal by Different Hemofiltration Membranes: A Pilot Study

Area of Science:

• Nephrology
• Cardiovascular Science
• Biomaterials Science

Background:

• Atherosclerosis is a major cause of mortality in chronic kidney disease (CKD) patients, linked to significant inflammatory responses.
• Identifying effective methods to mitigate this inflammation during dialysis is crucial for CKD patient care.

Purpose of the Study:

• To evaluate the in vitro efficacy of different dialysis membranes in removing atherosclerosis-associated inflammatory mediators.
• To investigate the removal mechanisms and kinetics of these mediators using a closed-loop hemodialysis model.

Main Methods:

• In vitro hemodialysis experiments using three distinct membrane materials (HeprAN, PMMA, PES) with pre-incubated human plasma.
• Measurement of 17 inflammatory mediators over 240 minutes in a closed-loop system.
• Statistical comparison of mediator removal, including specific assays for tumor necrosis factor-alpha (TNF-α) variability.

Main Results:

• Most tested mediators were effectively removed by the dialysis membranes, primarily through adsorption.
• Optimal mediator removal occurred for molecules in the 10,000-20,000 Da range.
• The HeprAN membrane demonstrated rapid removal of mediators with high isoelectric points, including complement factors, chemokines, plasminogen activator inhibitor (PAI-1), and TNF-α-like substances.
• HeprAN and PMMA showed significantly greater removal of TNF-α-like substances compared to PES (P < 0.01).

Conclusions:

• Dialysis membranes, especially ionic adsorptive types like HeprAN, can effectively remove key inflammatory mediators implicated in CKD-associated atherosclerosis.
• These findings suggest that ionic adsorptive membranes may offer therapeutic benefits for CKD patients with atherosclerosis.
• Further clinical investigation is warranted to confirm the efficacy of these membranes in a patient setting.