The effects of alginate composition on encapsulated βTC3 cells

C. Stabler, K. Wilks, A. Sambanis, I. Constantinidis

Research output: Contribution to journalArticlepeer-review

120 Scopus citations

Abstract

The effects of alginate composition on the growth of murine insulinoma βTC3 cells encapsulated in alginate/poly-L-lysine/alginate (APA) beads, and on the overall metabolic and secretory characteristics of the encapsulated cell system, were investigated for four different types of alginate. Two of the alginates used had a high guluronic acid content (73% in guluronic acid residues) with varying molecular weight, while the other two had a high mannuronic acid content (68% in mannuronic acid residues) with varying molecular weight. Each composition was tested using two different polymer concentrations. Our data show that βTC3 cells encapsulated in alginates with a high guluronic acid content experienced a transient hindrance in their metabolic and secretory activity because of growth inhibition. Conversely, βTC3 cells encapsulated in alginates with a high mannuronic acid content experienced a rapid increase in metabolic and secretory activity as a result of rapid cell growth. Our data also demonstrate that an increase in either molecular weight or concentration of high mannuronic acid alginates did not alter the behavior of the encapsulated βTC3 cells. Conversely, an increase in molecular weight and concentration of high guluronic acid alginates prolonged the hindrance of glucose metabolism, insulin secretion and cell growth. These observations can be best interpreted by changes in the microstructure of the alginate matrix, i.e., interaction between the contiguous guluronic acid residues and the Ca2+ ions, as a result of the different compositions.

Original languageEnglish (US)
Pages (from-to)1301-1310
Number of pages10
JournalBiomaterials
Volume22
Issue number11
DOIs
StatePublished - Jun 1 2001

Keywords

  • βTC3 insulinoma cells
  • Alginate
  • Bioartificial pancreas
  • Guluronic acid
  • Mannuronic acid

ASJC Scopus subject areas

  • Biotechnology
  • Bioengineering
  • Biomedical Engineering

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