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Multilayered Freestanding Porous Polycarbonate Nanosheets with Directed Protein Permeability for Cell-Encapsulated
Nanami Zushi1, Megumi Takuma1, Atena Endo1
1School of Life Science and Technology, Institute of Science Tokyo, B-50, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8501, Japan.
ACS Applied Bio Materials
|February 14, 2025
Summary
Researchers developed a novel porous polycarbonate nanosheet for implantable devices to treat type 1 diabetes. This ultrathin membrane significantly improves insulin release and permeability, overcoming key challenges in current cell-encapsulation therapies.
Area of Science:
- Biomaterials Science
- Diabetes Technology
- Nanotechnology
Background:
- Type 1 diabetes treatment requires implantable devices for pancreatic beta cell encapsulation.
- Current devices use porous polycarbonate membranes, but immediate insulin release remains a challenge.
- Immune rejection and protein clogging are significant hurdles in existing semipermeable membranes.
Purpose of the Study:
- To develop a freestanding, ultrathin porous polymer nanosheet for enhanced molecular permeability in cell-encapsulated devices.
- To improve insulin release kinetics and reduce protein clogging compared to conventional membranes.
- To create a novel semipermeable membrane for improved type 1 diabetes treatment devices.
Main Methods:
- Fabrication of a nonbiodegradable porous polycarbonate (PC) nanosheet using gravure coating with a PC and polystyrene (PS) blend.
- Optimization of the PC:PS weight ratio (3:1) to achieve a nanosheet thickness of 100 nm and diameter < 2.5 μm.
- Multilayer stacking of porous nanosheets with controlled pore sizes to regulate protein permeability.
Main Results:
- A triple layer of porous PC nanosheets exhibited 10 times higher insulin permeability and 10 times less protein clogging than commercial PC membranes.
- The nanosheet maintained comparable immunoglobulin G (IgG) blocking capability.
- Cell-encapsulated devices with the nanosheet preserved glucose-responsive insulin secretion from beta cells.
Conclusions:
- The developed porous PC nanosheet offers superior permeability and reduced clogging for cell-encapsulated devices.
- This ultrathin membrane technology holds promise for enabling immediate insulin release in type 1 diabetes treatments.
- The nanosheet facilitates improved functionality and performance of implantable beta cell therapies.
