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Updated: Aug 1, 2026
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Cellular Encapsulation in 3D Hydrogels for Tissue Engineering
Published on: October 26, 2009
Making microencapsulation work: conformal coating, immobilization gels and in vivo performance
M V Sefton1, M H May, S Lahooti
1Institute for Biomaterials and Biomedical Engineering and Department of Chemical Engineering and Applied Chemistry, University of Toronto, Toronto, Ontario, Canada. sefton@ecf.utoronto.ca
Summary
Cell microencapsulation shows promise for protein delivery but faces challenges. Researchers explored conformal coating with poly(hydroxyethyl methacrylate-co-methyl methacrylate) (HEMA-MMA) and found varying cell viability post-implantation, indicating further development is needed for clinical use.
Area of Science:
- Biomaterials Science
- Tissue Engineering
- Cell Encapsulation Technology
Background:
- Cell microencapsulation is a promising strategy for protein and gene therapy delivery.
- Current methods face challenges in maintaining cell viability and controlling the transplant volume.
Purpose of the Study:
- To investigate poly(hydroxyethyl methacrylate-co-methyl methacrylate) (HEMA-MMA) for conformal cell microencapsulation.
- To assess the impact of immobilization matrices on encapsulated cell phenotype and viability.
- To evaluate the in vivo viability of encapsulated cells after implantation.
Main Methods:
- Conformal coating of cell aggregates using HEMA-MMA at a liquid-liquid interface.
- Co-encapsulation of immobilization matrices like agarose and Matrigel.
- In vivo implantation studies in Wistar rats and C3H mice.
Main Results:
- HEMA-MMA conformal coating minimized polymer volume and maintained HepG2 cell viability.
- Ultralow gelling temperature agarose promoted HEK293 cell proliferation; Matrigel improved C2C12 cell viability.
- Hepatoma cell microcapsules showed rapid viability loss in rats, attributed to tissue reaction; L929 cells showed ~50% viability in mice.
Conclusions:
- HEMA-MMA microencapsulation is a viable technique for cell delivery, with potential for controlling cell phenotype via co-encapsulated matrices.
- In vivo performance remains a significant hurdle, with variable cell survival dependent on cell type and implantation site.
- Further advancements in tissue engineering constructs are required before routine human application.
