A scalable device-less biomaterial approach for subcutaneous islet transplantation.

Autor: Vlahos AE; Institute of Biomaterial and Biomedical Engineering, University of Toronto, Toronto, Canada, M5S 3G9., Talior-Volodarsky I; Institute of Biomaterial and Biomedical Engineering, University of Toronto, Toronto, Canada, M5S 3G9., Kinney SM; Institute of Biomaterial and Biomedical Engineering, University of Toronto, Toronto, Canada, M5S 3G9; Department of Chemical Engineering and Applied Chemistry, University of Toronto, Toronto, Ontario, Canada, M5S 3G9., Sefton MV; Institute of Biomaterial and Biomedical Engineering, University of Toronto, Toronto, Canada, M5S 3G9; Department of Chemical Engineering and Applied Chemistry, University of Toronto, Toronto, Ontario, Canada, M5S 3G9. Electronic address: michael.sefton@utoronto.ca.
Jazyk: angličtina
Zdroj: Biomaterials [Biomaterials] 2021 Feb; Vol. 269, pp. 120499. Date of Electronic Publication: 2020 Nov 02.
DOI: 10.1016/j.biomaterials.2020.120499
Abstrakt: The subcutaneous space has been shown to be a suitable site for islet transplantation, however an abundance of islets is required to achieve normoglycemia, often requiring multiple donors. The loss of islets is due to the hypoxic conditions islets experience during revascularization, resulting in apoptosis. Therefore, to reduce the therapeutic dosage required to achieve normoglycemia, pre-vascularization of the subcutaneous space has been pursued. In this study, we highlight a biomaterial-based approach using a methacrylic acid copolymer coating to generate a robust pre-vascularized subcutaneous cavity for islet transplantation. We also devised a simple, but not-trivial, procedure for filling the cavity with an islet suspension in collagen. We show that the pre-vascularized site can support a marginal mass of islets to rapidly return streptozotocin-induced diabetic SCID/bg mice to normoglycemia. Furthermore, immunocompetent Sprague Daley rats remained normoglycemia for up to 70 days until they experienced graft destabilization as they outgrew their implants. This work highlights methacrylic acid-based biomaterials as a suitable pre-vascularization strategy for the subcutaneous space that is scalable and doesn't require exogenous cells or growth factors.
(Copyright © 2020. Published by Elsevier Ltd.)
Databáze: MEDLINE
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