Microfluidics-generated pancreatic islet microfibers for enhanced immunoprotection

Yesl Jun, Min Jun Kim, Yong Hwa Hwang, Eun Ae Jeon, Ah Ran Kang, Sang Hoon Lee, Dong Yun Lee

Research output: Contribution to journalArticle

61 Citations (Scopus)

Abstract

Pancreatic islet transplantation is a promising method for treatment of type 1 diabetes mellitus. However, transplanted islets can be destroyed due to host immune reactions. To immunologically protect transplanted islets, here an immunoprotective microfiber including islets by using a polydimethylsiloxane (PDMS)-based microfluidic device is newly designed. A cylindrical-flow channel in the microfluidic platform is used for producing collagen-alginate composite (CAC) fibers. This enables mass production and uniform diameter distribution (<250μm) without protruding islets. Collagen, which is the main extracellular matrix component, is added to alginate to mimic the native islet microenvironment. Compared to free islets (control) and alginate-fiber-encapsulated islets, CAC-fiber-encapsulated islets show higher viability and normal insulin secretion. When CAC-fiber-encapsulated islets (1200 islet equivalent) are implanted into the intraperitoneal cavity of streptozotocin-induced diabetic BALB/C mice, the blood glucose levels of all mice return to normoglycemia. Moreover, intraperitoneal glucose tolerance tests demonstrate that islets in the CAC-fiber have similar glucose responsiveness to those of non-diabetic normal mice. These results are attributed to the immunoprotection of the transplanted islets from host immune reactions. On the other hand, all free islets are completely rejected within a week due to severe immune responses. Collectively, fabrication of CAC fibers using microfluidic devices can be used for successful islet transplantation.

Original languageEnglish
Pages (from-to)8122-8130
Number of pages9
JournalBiomaterials
Volume34
Issue number33
DOIs
Publication statusPublished - 2013 Nov

Keywords

  • Collagen-Alginate composite (CAC)
  • Immunoprotection
  • Islet encapsulation
  • Microfluidics
  • Xenotransplantation

ASJC Scopus subject areas

  • Bioengineering
  • Ceramics and Composites
  • Biophysics
  • Biomaterials
  • Mechanics of Materials

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  • Cite this

    Jun, Y., Kim, M. J., Hwang, Y. H., Jeon, E. A., Kang, A. R., Lee, S. H., & Lee, D. Y. (2013). Microfluidics-generated pancreatic islet microfibers for enhanced immunoprotection. Biomaterials, 34(33), 8122-8130. https://doi.org/10.1016/j.biomaterials.2013.07.079