Biological Assessments of Encapsulated Pancreatic β-Cells: Their Potential Transplantation in Diabetes

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• 作者：Armin Mooranian ; Rebecca Negrulj ; Emma Jamieson…
• 关键词：Artificial cell microencapsulation ; Bile acids ; Biomaterials ; Pancreatic β ; cell transplantation ; Inflammation
• 刊名：Cellular and Molecular Bioengineering
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：9
• 期：4
• 页码：530-537
• 全文大小：2,559 KB
• 刊物类别：Engineering
• 刊物主题：Biomedical Engineering
  Mechanics
  Continuum Mechanics and Mechanics of Materials
  Biophysics and Biomedical Physics
  Cell Biology
  
• 出版者：Springer New York
• ISSN：1865-5033
• 卷排序：9

文摘

Microencapsulation of pancreatic islets has been considered as a promising method for cell transplantation and diabetes treatment. However, in vivo trials to date have been hampered by fibrotic overgrowth and very limited to no success, long-term. Future success requires suitable microencapsulating method and possibly a simplified and suitable formulation which will produce a microcapsule that provides an immunobarrier, maintain full β-cell functionality whilst also reducing the inflammatory processes that induce fibrosis. In multiple studies, we screened various formulations and microencapsulating methods, and obtained promising results using bile acid-based microcapsules containing β-cells, in terms of cell functions and insulin release. Thus, this study aimed to refine further the microencapsulating method using a simple alginate-poly-l-ornithine formulation and test the effect of adding a promising bile acid, ursodeoxycholic acid (UDCA), on cell functions. Using Büchi concentric nozzle, viable NIT-1 cells were microencapsulated using alginate-poly-l-ornithine, with or without UDCA at a ratio of 1:1.2 or 1:1.2:4. Screening for nozzle temperature and nozzle-gelation bath distance was carried out to form best microcapsules. Microcapsules were cultured for 48 h and examined for size and surface morphology, chemical profiling and β-cell viability. Culture supernatants were examined for insulin and inflammatory cytokines. When using 30 °C nozzle-temperature and 5 cm nozzle-gelation bath distance, in the presence of the bile acid, cell mitochondrial activities and insulin production were optimised. Under deployed microencapsulating method with nozzle-temperature of 30 °C and nozzle-gelation bath distance of 5 cm, the incorporation of the bile acid into the microcapsules resulted in enhanced β-cell survival, function and improved overall biocompatibility supporting potential applications in transplantation.