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Published on: April 17, 2012
Cross-shaped nanoporous poly(methyl methacrylate) fibers for selective adsorption of β2-microglobulin and other
Hiroaki Fujieda1,2, Tomoaki Osuka1, Masaru Nakada3
1Toray Industries, Inc., Advanced Materials Research Laboratories, Otsu, Shiga, Japan.
Background:
Dialysis-related amyloidosis (DRA) is a serious complication in chronic kidney disease patients on long-term dialysis, caused by β2-microglobulin (β2-MG) accumulation, and remains challenging owing to the growing dialysis population and extended treatment duration.
Objectives:
To develop and evaluate stereocomplex poly(methyl methacrylate) (PMMA) adsorbent fibers with optimized cross-sectional and nanoporous structures for efficient, selective β2-MG removal.
Methods:
Structured PMMA fibers were fabricated via dry-wet spinning. The adsorption performance of optimized fibers was evaluated with serum containing β2-MG and other solutes, using scanning electron microscopy (SEM), three-dimensional transmission electron microscopy (3D-TEM), and time-of-flight secondary ion mass spectrometry (TOF-SIMS). Pressure loss simulations compared fiber- and bead-packed columns.
Results:
Fibers with 12-15 nm pores exhibited maximal β2-MG adsorption. Cross-shaped fibers exhibited the highest blood-contact surface area and adsorption capacity. A thin surface-dense layer (<0.1 μm) improved β2-MG diffusion while limiting albumin uptake. TOF-SIMS confirmed uniform β2-MG penetration, with albumin confined near the fiber surface. Adsorption exceeded 50% for mid-weight proteins (~52 kDa), including IL-6, α1-microglobulin (α1-MG), and TNF-α. Pressure loss simulations showed that fiber-packed columns had lower resistance than bead-packed columns.
Conclusions:
Optimized cross-shaped PMMA fibers enable efficient, selective β2-MG removal and favorable flow dynamics for hemoperfusion therapies targeting mid-weight uremic toxins.
Insights
New adsorbent fibers effectively remove beta-2 microglobulin (β2-MG), a key cause of dialysis-related amyloidosis. These optimized fibers offer improved hemoperfusion therapy for chronic kidney disease patients.
Area of Science:
- Biomaterials science and regenerative medicine
- Nephrology and dialysis technology
- Nanotechnology for medical applications
Background:
- Dialysis-related amyloidosis (DRA) is a severe complication in patients undergoing long-term dialysis.
- Accumulation of beta-2 microglobulin (β2-MG) causes DRA, posing a challenge due to the increasing dialysis population.
- Current treatments for DRA are limited, necessitating novel approaches for β2-MG removal.
Purpose of the Study:
- To engineer stereocomplex poly(methyl methacrylate) (PMMA) adsorbent fibers with tailored structures for enhanced β2-MG adsorption.
- To evaluate the efficiency and selectivity of these PMMA fibers in removing β2-MG from serum.
- To assess the hemodynamic properties of fiber-based adsorbents for hemoperfusion.
Main Methods:
- Fabrication of structured PMMA fibers using dry-wet spinning techniques.
- Characterization of fiber morphology and nanoporous structure using SEM and 3D-TEM.
- Evaluation of adsorption performance with β2-MG-spiked serum and analysis using TOF-SIMS.
- Computational fluid dynamics simulations to compare pressure drop in fiber-packed versus bead-packed columns.
Main Results:
- PMMA fibers with 12-15 nm pores demonstrated optimal β2-MG adsorption capacity.
- Cross-shaped fibers exhibited superior blood-contact surface area and adsorption efficiency.
- A surface-dense layer (<0.1 μm) facilitated β2-MG diffusion while minimizing albumin adsorption.
- Significant adsorption (>50%) of mid-weight uremic toxins like IL-6, α1-MG, and TNF-α was observed.
- Fiber-packed columns showed lower pressure resistance compared to traditional bead-packed columns.
Conclusions:
- Optimized cross-shaped PMMA fibers provide an effective means for selective β2-MG removal.
- These fibers demonstrate potential for use in hemoperfusion therapies targeting mid-weight uremic toxins.
- The developed adsorbent fibers offer favorable flow dynamics, improving hemoperfusion treatment efficiency.
