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Related Concept Videos

Glucose Homeostasis: Pancreatic Islets and Insulin Secretion01:27

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The pancreatic islets comprising only 1%-2% of the volume are highly vascularized and innervated mini-organs. They contain five endocrine cell types, including β cells that secrete insulin, which is synthesized as a single polypeptide chain, preproinsulin, processed to proinsulin, and finally to insulin and C-peptide. This process is complex and regulated, involving the Golgi complex, the endoplasmic reticulum, and the secretory granules of the β cell.
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Quantitative and Temporal Control of Oxygen Microenvironment at the Single Islet Level
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Intraportal islet oxygenation.

Thomas M Suszynski1, Efstathios S Avgoustiniatos1, Klearchos K Papas2

  • 1Department of Surgery, University of Minnesota, Minneapolis, MN, USA.

Journal of Diabetes Science and Technology
|May 31, 2014
PubMed
Summary
This summary is machine-generated.

Islet transplantation (IT) success is limited by early islet loss, potentially due to poor oxygenation. Optimizing oxygen supply is crucial, as larger islets, vital for insulin independence, are most vulnerable to anoxic conditions post-transplant.

Keywords:
anoxiahypoxiaintraportal transplantislet transplantoxygenation

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Area of Science:

  • Endocrinology
  • Transplantation Biology
  • Biomedical Engineering

Background:

  • Islet transplantation (IT) offers a promising treatment for diabetes, but widespread application is hindered by the significant loss of transplanted islets.
  • Poor oxygenation in the early post-transplant period is a suspected cause of islet dysfunction and loss, yet it remains understudied.

Purpose of the Study:

  • To investigate the impact of oxygen-limiting conditions on intraportal islet viability and function.
  • To identify key variables affecting islet oxygenation and their influence on islet survival and function.

Main Methods:

  • Analysis of key variables affecting islet oxygenation: local oxygen partial pressure (pO(2)), islet oxygen consumption, islet size, and thrombosis.
  • Evaluation of islet size distribution data from clinical islet preparations to determine the proportion of islet volume represented by different size fractions.

Main Results:

  • Islet size is a critical determinant of anoxic and nonfunctional islet volume fractions, with larger islets being more susceptible to oxygen deprivation.
  • Clinical data reveal that larger islets (>150-µm diameter) constitute a significant portion of total islet volume (>85%) despite representing a smaller fraction of the total islet number (~30%).
  • Thrombus formation on the islet surface can also substantially impact islet viability.

Conclusions:

  • Improving oxygen supply to islets could significantly enhance islet survivability and function, particularly for larger islets which contain the majority of beta-cell volume.
  • The suitability of the liver as an islet transplant site, from an oxygenation perspective, warrants re-evaluation.