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Related Experiment Video

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A Method for Islet Transplantation to the Omentum in Mouse
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Does Islet Size Really Influence Graft Function After Clinical Islet Transplantation?

Stephen J Hughes1, Paul A Bateman1, Sarah E Cross1

  • 1Islet Transplant Research Group, Nuffield Department of Surgical Sciences and Oxford Centre for Diabetes, Endocrinology and Metabolism (OCDEM), University of Oxford, Oxford, United Kingdom.

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Islet size does not impact transplant success in type 1 diabetes. Both small and large islets are suitable for transplantation after a short culture period, with islet number being the strongest predictor of graft function.

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Area of Science:

  • Endocrinology
  • Transplantation Immunology
  • Cell Biology

Background:

  • Hypothesized that smaller islets may offer better graft function post-transplant due to reduced hypoxic damage.
  • Investigated the relationship between islet size and in vivo graft function in type 1 diabetes patients undergoing islet transplantation.
  • Pre-transplant islet culture was a key factor in the study design.

Purpose of the Study:

  • To determine if islet size correlates with in vivo graft function in islet transplant recipients with type 1 diabetes.
  • To assess the impact of pre-transplant islet culture on the relationship between islet size and graft outcomes.
  • To identify key factors influencing successful islet transplantation.

Main Methods:

  • Human pancreatic islets were isolated and cultured for 24 hours before transplantation.
  • Standardized protocols were used for islet infusion.
  • Stimulated C-peptide levels were measured via meal tolerance tests 3 months post-transplant.
  • Islet isolation index (IEq/islet number) was assessed pre- and post-culture.
  • Correlations were analyzed between islet metrics and patient insulin requirements or C-peptide levels.

Main Results:

  • Stimulated C-peptide showed a significant correlation with islet number at transplantation (P=0.001).
  • Islet number at transplantation was the strongest predictor of graft function (r=0.722, P=0.001).
  • Islet size itself was not directly related to graft function when adjusted for islet volume or number.

Conclusions:

  • No clear correlation was found between the islet isolation index and graft function.
  • Both small and large islets are viable for transplantation.
  • Successful islet transplantation depends on islet survival during a short post-isolation culture period.