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Herič T, Vivoda T, Bogataj Š, Pajek J. Medium Cut-Off Dialysis Membrane and Dietary Fiber Effects on Inflammation and Protein-Bound Uremic Toxins: A Systematic Review and Protocol for an Interventional Study. Toxins (Basel) 2021; 13:toxins13040244. [PMID: 33805509 PMCID: PMC8066258 DOI: 10.3390/toxins13040244] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2020] [Revised: 03/22/2021] [Accepted: 03/25/2021] [Indexed: 02/07/2023] Open
Abstract
The aim of this systematic review is to investigate the effects of the use of a medium cut-off membrane (MCO) and dietary fiber on the concentration of protein-bound uremic toxins (PBUTs) and inflammatory markers in hemodialysis (HD) patients. Of 11,397 papers originally found, eight met the criteria of randomized controlled trial design. No study examined the effects of MCO membranes on PBUTs. Three studies examined the reduction in inflammatory markers with MCO membranes compared to high-flux HD membranes and showed no significant differences. Five studies of dietary fiber supplementation showed an inconclusive positive effect on PBUT levels and a significant positive effect on the reduction in inflammatory markers (interleukin-6 reduction: standardized difference in means −1.18; 95% confidence interval −1.45 to −0.9 for dietary fiber supplementation vs. control; p < 0.001). To date, no study has combined the use of an MCO membrane and fiber supplementation to reduce PBUT levels and inflammation with online hemodiafiltration as a comparator. A rationale and protocol for an interventional trial using a combination of MCO membrane dialysis and fiber supplementation to lower inflammatory markers and PBUT concentrations are presented.
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Affiliation(s)
- Tjaša Herič
- Department of Nephrology, University Medical Centre Ljubljana, 1000 Ljubljana, Slovenia; (T.H.); (T.V.); (Š.B.)
| | - Tjaša Vivoda
- Department of Nephrology, University Medical Centre Ljubljana, 1000 Ljubljana, Slovenia; (T.H.); (T.V.); (Š.B.)
| | - Špela Bogataj
- Department of Nephrology, University Medical Centre Ljubljana, 1000 Ljubljana, Slovenia; (T.H.); (T.V.); (Š.B.)
| | - Jernej Pajek
- Department of Nephrology, University Medical Centre Ljubljana, 1000 Ljubljana, Slovenia; (T.H.); (T.V.); (Š.B.)
- Department of Internal Medicine, Faculty of Medicine, University of Ljubljana, 1000 Ljubljana, Slovenia
- Correspondence:
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Gamage HKAH, Tetu SG, Chong RWW, Bucio-Noble D, Rosewarne CP, Kautto L, Ball MS, Molloy MP, Packer NH, Paulsen IT. Fiber Supplements Derived From Sugarcane Stem, Wheat Dextrin and Psyllium Husk Have Different In Vitro Effects on the Human Gut Microbiota. Front Microbiol 2018; 9:1618. [PMID: 30072976 PMCID: PMC6060387 DOI: 10.3389/fmicb.2018.01618] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2018] [Accepted: 06/28/2018] [Indexed: 12/12/2022] Open
Abstract
There is growing public interest in the use of fiber supplements as a way of increasing dietary fiber intake and potentially improving the gut microbiota composition and digestive health. However, currently there is limited research into the effects of commercially available fiber supplements on the gut microbiota. Here we used an in vitro human digestive and gut microbiota model system to investigate the effect of three commercial fiber products; NutriKane™, Benefiber® and Psyllium husk (Macro) on the adult gut microbiota. The 16S rRNA gene amplicon sequencing results showed dramatic fiber-dependent changes in the gut microbiota structure and composition. Specific bacterial OTUs within the families Bacteroidaceae, Porphyromonadaceae, Ruminococcaceae, Lachnospiraceae, and Bifidobacteriaceae showed an increase in the relative abundances in the presence of one or more fiber product(s), while Enterobacteriaceae and Pseudomonadaceae showed a reduction in the relative abundances upon addition of all fiber treatments compared to the no added fiber control. Fiber-specific increases in SCFA concentrations showed correlation with the relative abundance of potential SCFA-producing gut bacteria. The chemical composition, antioxidant potential and polyphenolic content profiles of each fiber product were determined and found to be highly variable. Observed product-specific variations could be linked to differences in the chemical composition of the fiber products. The general nature of the fiber-dependent impact was relatively consistent across the individuals, which may demonstrate the potential of the products to alter the gut microbiota in a similar, and predictable direction, despite variability in the starting composition of the individual gut microbiota.
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Affiliation(s)
- Hasinika K. A. H. Gamage
- Department of Molecular Sciences, Macquarie University, Sydney, NSW, Australia
- Australian Research Council Industrial Transformation Training Centre for Molecular Technologies in the Food Industry, Macquarie University, Sydney, NSW, Australia
| | - Sasha G. Tetu
- Department of Molecular Sciences, Macquarie University, Sydney, NSW, Australia
| | - Raymond W. W. Chong
- Department of Molecular Sciences, Macquarie University, Sydney, NSW, Australia
- Australian Research Council Industrial Transformation Training Centre for Molecular Technologies in the Food Industry, Macquarie University, Sydney, NSW, Australia
| | - Daniel Bucio-Noble
- Department of Molecular Sciences, Macquarie University, Sydney, NSW, Australia
- Australian Research Council Industrial Transformation Training Centre for Molecular Technologies in the Food Industry, Macquarie University, Sydney, NSW, Australia
| | - Carly P. Rosewarne
- Commonwealth Scientific and Industrial Research Organisation, Sydney, NSW, Australia
| | - Liisa Kautto
- Department of Molecular Sciences, Macquarie University, Sydney, NSW, Australia
- Australian Research Council Industrial Transformation Training Centre for Molecular Technologies in the Food Industry, Macquarie University, Sydney, NSW, Australia
| | | | - Mark P. Molloy
- Department of Molecular Sciences, Macquarie University, Sydney, NSW, Australia
- Australian Research Council Industrial Transformation Training Centre for Molecular Technologies in the Food Industry, Macquarie University, Sydney, NSW, Australia
| | - Nicolle H. Packer
- Department of Molecular Sciences, Macquarie University, Sydney, NSW, Australia
- Australian Research Council Industrial Transformation Training Centre for Molecular Technologies in the Food Industry, Macquarie University, Sydney, NSW, Australia
| | - Ian T. Paulsen
- Department of Molecular Sciences, Macquarie University, Sydney, NSW, Australia
- Australian Research Council Industrial Transformation Training Centre for Molecular Technologies in the Food Industry, Macquarie University, Sydney, NSW, Australia
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