Issue 20, 2016

Development of a cell delivery system using alginate microbeads for tissue regeneration

Abstract

Alginate microbeads incorporating adipose-derived stem cells (ASCs) have potential for delivering viable cells capable of facilitating tissue regeneration. These microbeads are formed in calcium crosslinking solutions containing organic osmolytes to ensure physiological osmolality, but the comparative effects of these osmolytes on the microencapsulated cells are not known. In addition, delivery parameters needed to use microencapsulated cells for tissue regeneration remain unknown. We investigated the following parameters: (1) osmolyte effects on microbead diameter, cell viability and growth factor production; (2) the effect of the number of cells per microbead and the number of microbeads per unit volume on cell viability, growth factor production, and microbead degradation; (3) the ability of both degradable and non-degradable alginate microbeads to localize cells at the delivery site in vivo; and (4) whether alginate microbeads containing alginate-lyase elicit an inflammatory response after repeated exposure. Smallest microbead diameters were achieved using glucose as the osmolyte but cell viability and growth factor production did not depend on osmolyte type. As cell number per microbead or microbead number per well increased, growth factor production per cell decreased although percent cell viability was unchanged. The rate of cell release varied with the number of beads per well and with the number of cells per microbead. At the highest microbead density and at the lowest density of cells per microbead, cell release was delayed. Therefore fewer microbeads may be sufficient for clinical applications. Both degradable (0.22 U g−1) and non-degradable (0 U g−1) alginate microbeads localized cells at the delivery site. Degradable alginate microbeads delivered subcutaneously elicited a mild chronic inflammatory response on second exposure, but how this might impact repeated use of the technology remains to be determined.

Graphical abstract: Development of a cell delivery system using alginate microbeads for tissue regeneration

Article information

Article type
Paper
Submitted
08 Қаң. 2016
Accepted
11 Нау. 2016
First published
21 Нау. 2016

J. Mater. Chem. B, 2016,4, 3515-3525

Development of a cell delivery system using alginate microbeads for tissue regeneration

S. K. Leslie, A. M. Nicolini, G. Sundaresan, J. Zweit, B. D. Boyan and Z. Schwartz, J. Mater. Chem. B, 2016, 4, 3515 DOI: 10.1039/C6TB00035E

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements