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Related Experiment Video

Updated: Jun 21, 2025

Quantitative and Temporal Control of Oxygen Microenvironment at the Single Islet Level
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Hypoxia within subcutaneously implanted macroencapsulation devices limits the viability and functionality of densely

Samuel A Einstein1,2, Leah V Steyn3, Bradley P Weegman1,4

  • 1Center for Magnetic Resonance Research, Department of Radiology, University of Minnesota, Minneapolis, MN, United States.

Frontiers in Transplantation
|July 12, 2024
PubMed
Summary

Subcutaneous islet macroencapsulation shows low oxygen levels (PO2) within devices, impacting islet viability. Higher islet density leads to lower viability, suggesting apoptosis is a key factor in cell loss.

Keywords:
fluorine-19hypoxiaimmunoisolationislet transplantationmagnetic resonance spectroscopytissue engineering

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Last Updated: Jun 21, 2025

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Area of Science:

  • Biomedical Engineering
  • Islet Transplantation
  • Biomaterials

Background:

  • Subcutaneous macroencapsulation offers an alternative to intraportal islet therapy.
  • Achieving a curative dose necessitates dense islet packing within devices.
  • Oxygen availability is critical for densely packed islet survival.

Purpose of the Study:

  • To measure internal oxygen levels in subcutaneous macroencapsulation devices.
  • To model oxygen availability and islet viability within these devices.
  • To assess the impact of islet density on viability in implanted devices.

Main Methods:

  • Noninvasive 19F-MRS was used to measure partial pressure of oxygen (PO2) in empty devices.
  • A mathematical model predicted internal PO2 and islet viability based on external PO2.
  • Islet viability was assessed by oxygen consumption rate (OCR) in explanted devices at varying densities.

Main Results:

  • Internal PO2 in empty devices was ≤12 mmHg, even with vascularization.
  • Islet viability was lower than predicted by the model.
  • Apoptosis, indicated by caspase-3 co-localization, contributed to beta cell loss.

Conclusions:

  • Oxygen levels within subcutaneous macroencapsulation devices are limited.
  • Islet viability is inversely proportional to cell density within the device.
  • Strategies to improve oxygenation are needed for successful islet macroencapsulation.