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Towards a medically approved technology for alginate-based microcapsules allowing long-term immunoisolated transplantation

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Abstract

The concept of encapsulated-cell therapy is very appealing, but in practice a great deal of technology and know-how is needed for the production of long-term functional transplants. Alginate is one of the most promising biomaterials for immunoisolation of allogeneic and xenogeneic cells and tissues (such as Langerhans islets). Although great advances in alginate-based cell encapsulation have been reported, several improvements need to be made before routine clinical applications can be considered. Among these is the production of purified alginates with consistently high transplantation-grade quality. This depends to a great extent on the purity of the input algal source as well as on the development of alginate extraction and purification processes that can be validated. A key engineering challenge in designing immunoisolating alginate-based microcapsules is that of maintaining unimpeded exchange of nutrients, oxygen and therapeutic factors (released by the encapsulated cells), while simultaneously avoiding swelling and subsequent rupture of the microcapsules. This requires the development of efficient, validated and well-documented technology for cross-linking alginates with divalent cations. Clinical applications also require validated technology for long-term cryopreservation of encapsulated cells to maintaining a product inventory in order to meet end-user demands. As shown here these demands could be met by the development of novel, validated technologies for production of transplantation-grade alginate and microcapsule engineering and storage. The advances in alginate-based therapy are demonstrated by transplantation of encapsulated rat and human islet grafts that functioned properly for about 1 year in diabetic mice.

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Authors and Affiliations

  1. Abteilung Kryobiophysik & Kryotechnologie, Fraunhofer-Institut für Biomedizinische Technik, 66386, St. Ingbert, Germany

    H. Zimmermann, A. Katsen, F. R. Ihmig & F. Ehrhart

  2. Abteilung für Biophysikalische Chemie, Max-Planck-Institut für Biophysik, 60439, Frankfurt, Germany

    D. Zimmermann

  3. Lehrstuhl für Biotechnologie, Biozentrum, Universität Würzburg, 97074, Würzburg, Germany

    R. Reuss, M. Weber, P. Geßner, M. Behringer, A. Steinbach, L. H. Wegner, V. L. Sukhorukov & U. Zimmermann

  4. Schwerpunkt Endokrinologie und Stoffwechselerkrankungen, Medizinische Klinik und Poliklinik, Universitätsklinik Mainz, 55131, Mainz, Germany

    P. J. Feilen & M. M. Weber

  5. Arbeitsgruppe Magnetische Resonanz, Fraunhofer-Institut für Biomedizinische Technik, 66386, St. Ingbert, Germany

    B. Manz & F. Volke

  6. Depto. Biologia Marina, Facultad de Ciencias del Mar, Universidad Catolica del Norte, Coquimbo, Chile

    J. A. Vásquez

  7. Allgemeine Innere Medizin, Endokrinologie und Diabetologie, Berufsgenossenschaftliche Kliniken Bergmannsheil, Universitätsklinik Bochum, 44789, Bochum, Germany

    S. Schneider

  8. Lehrstuhl für Zoologie I, Elektronenmikroskopie, Biozentrum, Universität Würzburg, 97074, Würzburg, Germany

    R. Wolf

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  1. H. Zimmermann
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Zimmermann, H., Zimmermann, D., Reuss, R. et al. Towards a medically approved technology for alginate-based microcapsules allowing long-term immunoisolated transplantation. J Mater Sci: Mater Med 16, 491–501 (2005). https://doi.org/10.1007/s10856-005-0523-2

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  • DOI: https://doi.org/10.1007/s10856-005-0523-2

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