Preparation of resorbable collagen-based beads for direct use in tissue engineering and cell therapy applications

• Published in: Journal of biomedical materials research. Part A 2010-03, Vol.92A (4), p.1301-1309
• Main Authors: Glattauer, Veronica, White, Jacinta F., Tsai, Wei-Bor, Tsai, Chen-Chi, Tebb, Tracy A., Danon, Stephen J., Werkmeister, Jerome A., Ramshaw, John A. M.
• Format: Article
• Language: English
• Subjects: Absorbable Implants; Anesthesia. Intensive care medicine. Transfusions. Cell therapy and gene therapy; Animals; Applied cell therapy and gene therapy; Biocompatible Materials - chemistry; Biocompatible Materials - metabolism; Biological and medical sciences; Biotechnology; cell culture; Cell- and Tissue-Based Therapy - instrumentation; Cell- and Tissue-Based Therapy - methods; cell-material interactions; Cells, Cultured; Chondrocytes - cytology; Chondrocytes - metabolism; collagen; Collagen - chemistry; Collagen - metabolism; demineralized bone; Fundamental and applied biological sciences. Psychology; gelatin; Gelatin - chemistry; Health. Pharmaceutical industry; Industrial applications and implications. Economical aspects; Materials Testing; Medical sciences; Mice; Mice, Nude; Miscellaneous; resorption; Surgery (general aspects). Transplantations, organ and tissue grafts. Graft diseases; Technology. Biomaterials. Equipments; tissue engineering; Tissue Engineering - instrumentation; Tissue Engineering - methods; Transfusions. Complications. Transfusion reactions. Cell and gene therapy
• ISSN: 1549-3296; 1552-4965; 1552-4965
• DOI: 10.1002/jbm.a.32468

For tissue engineering and cell therapy applications, expansion of cells such as chondrocytes on beads in spinner culture can provide advantages compared with monolayer culture. The use of resorbable beads that can be included as an integral part of the construct provides the advantage of minimizing the extent of cell handling and eliminating a final trypsin treatment to detach cells from the bead. In this study, we have made various types of beads based on native collagen and denatured collagen (gelatin). The beads have been stabilized by different extents of glutaraldehyde cross‐linking, and characterized by a combination of chemical analysis, thermal stability, and microscopy. In vitro examination in the presence and absence of chondrocytes showed that stability increased with the extent of crosslinking and could also be influenced by the manner of fabrication. On the basis of the in vitro stability studies, gelatin beads of a defined stability were shown to resorb over time in subcutaneous implants in nude mice compared with more stable demineralized bone particle (DMB) carriers. These data indicate that for direct use in tissue engineering or cell therapy applications, where resorbable beads can be used for cell expansion and then direct delivery of cells, it is possible to design suitable carrier beads with a range of stabilities that match the implant requirements. © 2009 Wiley Periodicals, Inc. J Biomed Mater Res 2010