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Targeting Protein-Bound Uremic Toxins: A Dual Approach with Medium Cut-Off Membrane Dialysis and a Dietary
Tjaša Herič1,2, Tjaša Vivoda1,2, Špela Bogataj1,3
1Department of Nephrology, University Medical Centre Ljubljana, 1000 Ljubljana, Slovenia.
Journal of Clinical Medicine
|May 13, 2026
Summary
Medium cut-off (MCO) dialysis and online hemodiafiltration (OL-HDF) showed similar effects on protein-bound uremic toxins (PBUTs). However, OL-HDF combined with dietary changes significantly reduced indoxyl sulfate levels in hemodialysis patients.
Area of Science:
- Nephrology
- Cardiovascular Medicine
- Gastroenterology
Background:
- Protein-bound uremic toxins (PBUTs), including p-cresyl sulfate (PCS) and indoxyl sulfate (IS), are linked to cardiovascular issues and mortality in hemodialysis (HD) patients.
- Conventional HD poorly removes PBUTs, and the effectiveness of medium cut-off (MCO) membranes is unclear.
- Gut microbial metabolism influences PBUT production, suggesting dietary interventions may be beneficial.
Purpose of the Study:
- To compare the efficacy of MCO-HD versus online hemodiafiltration (OL-HDF) in clearing PCS and IS.
- To investigate the combined effect of MCO dialysis or OL-HDF with dietary modifications (increased fiber and short-chain fatty acids) on PBUT levels.
Main Methods:
- A prospective randomized trial involving 62 maintenance HD patients.
- Patients were randomized to MCO-HD (EXP) or OL-HDF (CON) after a high-flux HD (HF-HD) wash-in period.
- An 8-week dietary intervention (19g fiber, 1g sodium propionate daily) was implemented, followed by a 4-week HF-HD wash-out period.
Main Results:
- No significant changes in PCS or IS were observed with dialysis modality alone.
- PCS levels remained stable throughout the study.
- Combined OL-HDF and dietary intervention significantly reduced IS levels compared to MCO-HD with diet (31.5 vs. 42.0 µmol/L; p=0.006).
Conclusions:
- MCO-HD and OL-HDF demonstrated comparable effects on serum PCS and IS concentrations.
- Only OL-HDF, when combined with dietary intervention, significantly lowered IS levels in hemodialysis patients.
- Dietary modifications play a crucial role in managing IS levels, particularly in conjunction with specific dialysis techniques.
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