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Biocompatibility of high-flux membranes
Insights
Modern high-flux dialyzers show superior biocompatibility compared to cuprophane membranes. These synthetic and semisynthetic membranes do not stimulate immune responses, unlike older cuprophane types.
Area of Science:
- Nephrology
- Immunology
- Biomaterials Science
Background:
- Standard dialysis membranes like cuprophane are known to activate the immune system, leading to the secretion of inflammatory cytokines.
- This immune stimulation indicates poor biocompatibility of cuprophane membranes.
Purpose of the Study:
- To investigate the immunogenic properties of three modern high-flux dialysis membranes.
- To compare the biocompatibility of novel membranes with conventional cuprophane.
Main Methods:
- A study involving seven patients undergoing hemodiafiltration.
- Serial measurements of immune markers including interleukin-1 beta, tumor necrosis factor (TNF), soluble IL-2 receptor, soluble CD4, soluble CD8, interferon gamma, and neopterin.
- Use of polysulfone, polymethylmetacrylate, and cellulose triacetate dialyzers.
Main Results:
- None of the modern high-flux dialyzers stimulated the production of key inflammatory factors (IL-1 beta, TNF, IL-2r).
- Significant decreases in neopterin and soluble CD4 levels were observed.
- Interferon gamma and soluble CD8 levels did not change significantly.
Conclusions:
- Modern high-flux dialyzers demonstrate non-immunogenic properties.
- Synthetic and semisynthetic membranes exhibit superior biocompatibility over conventional cuprophane membranes in dialysis.
Abstract:
Standard dialysis with cuprophane membranes is known to stimulate the immune system. As a result of activation of macrophages various interleukins and tumor necrosis factor (TNF) are secreted, presenting further evidence of the poor biocompatibility of cuprophane. We investigated the immunogenic properties of three modern high-flux membranes. Seven patients were studied during hemodiafiltration sessions using either a polysulfone (F60, Fresenius), a polymethylmetacrylate (BK 2.1, Toray) or a cellulose triacetate (FB-210 U, Nipro) dialyzer in a hemodiafiltration procedure. Serial measurements were made during each treatment of interleukin-1 beta (II-1 beta), TNF, soluble IL-2 receptor (sII-2r), soluble CD4 (sCD4), soluble CD8 (sCD8), interferon gamma (IFNg) and neopterin. In contrast to the known increase of IL-1 beta, IL-2r and TNF with cuprophane membranes, none of the modern high-flux dialyzers stimulated the production of these factors. Significant decreases of neopterin and sCD4 were observed. IFNg and sCD8 did not change significantly. Our results suggest that the modern high-flux dialyzers are non-immunogenic, and thus provide further evidence of the superior biocompatibility of synthetic or semisynthetic membranes over the conventional cuprophane.
