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Cell-compatible covalently reinforced beads obtained from a chemoenzymatically engineered alginate.
Anne Mari Rokstad1, Ivan Donati, Massimiliano Borgogna
1Department of Cancer Research and Molecular Medicine, Norwegian University of Science and Technology, Trondheim, Norway. anne.m.rokstad@ntnu.no
Biomaterials
|June 6, 2006
Summary
Chemists created stable, covalently linked alginate beads using a chemoenzymatic method. These new beads show promise as biocompatible bioreactors for therapeutic protein delivery.
Area of Science:
- Biomaterials Science
- Biotechnology
- Chemical Engineering
Background:
- Alginate beads are widely used in biomedical applications but often lack sufficient stability.
- Enhancing alginate gel stability is crucial for long-term cell encapsulation and therapeutic delivery.
- Existing methods for alginate modification have limitations in achieving robust, covalently linked structures.
Purpose of the Study:
- To develop a novel chemoenzymatic strategy for creating highly stable, covalently linked alginate beads.
- To improve the gel-forming ability and structural integrity of alginate beads through enzymatic modification and photocrosslinking.
- To evaluate the biocompatibility and performance of the new beads for cell encapsulation and potential therapeutic applications.
Main Methods:
- Grafting mannuronan (100% mannuronic acid alginate) with methacrylate moieties.
- Enzymatic conversion of mannuronic acid (M) to guluronic acid (G) in specific sequences (MG-blocks and G-blocks).
- Photopolymerization of methacrylate groups using a photoinitiating system to form covalent crosslinks.
- Assessing bead stability via EDTA treatment and evaluating cell compatibility with C2C12 myoblasts and human pancreatic islets.
Main Results:
- Successfully synthesized methacrylate-grafted alginate with enhanced gel-forming properties.
- Created chemoenzymatic photocrosslinked (CEPC) beads with demonstrated covalent linkages, remaining intact after EDTA treatment.
- CEPC beads exhibited excellent biocompatibility with low-proliferative cells (C2C12 myoblasts, human pancreatic islets), supporting insulin secretion.
- High-proliferative cells (293-endo cells) showed reduced viability within 2 weeks, indicating differential cell response.
Conclusions:
- The chemoenzymatic photocrosslinking strategy yields alginate beads with exceptional stability and improved gel-forming ability.
- CEPC beads are biocompatible and suitable for encapsulating cells with low proliferative capacity, such as pancreatic islets.
- These stable, cell-compatible CEPC beads hold significant potential as bioreactors for future therapeutic protein delivery applications.