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Related Experiment Videos

Islet cryopreservation.

R V Rajotte1, M G Evans, G L Warnock

  • 1Department of Surgery, University of Alberta, Edmonton, Canada.

Hormone and Metabolic Research. Supplement Series
|January 1, 1990
PubMed
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Cryopreservation of human islets offers significant advantages for transplantation. A specific freeze-thaw protocol demonstrates high survival rates in animal models, paving the way for clinical applications.

Area of Science:

  • Cellular biology
  • Transplantation immunology
  • Cryobiology

Background:

  • Improved human islet isolation methods necessitate effective storage solutions for transplantation.
  • Cryopreservation offers benefits including tissue banking, immunomodulation, purification, and simplified logistics.
  • Previous research explored various cooling rates for islet cryopreservation since 1976.

Purpose of the Study:

  • To evaluate an optimized cryopreservation protocol for human islets.
  • To assess the efficacy of freeze-thaw methods for islet survival and function.
  • To determine the potential of cryopreserved islets for clinical islet transplantation.

Main Methods:

  • Investigated slow cooling to -40°C followed by rapid thawing from -196°C.

Related Experiment Videos

  • Assessed islet survival and function using in-vitro and in-vivo assays.
  • Evaluated the protocol's effectiveness on rat islets, canine islets, and pancreatic microfragments.

    • Main Results:

    • The slow-cooling/rapid-thawing protocol yielded the highest islet survival rates in rats.
    • Viable pancreatic microfragments and pure dog islets were obtained, inducing prolonged normoglycemia.
    • The method also ensured prolonged survival of islet xenografts and purified microfragments.

    Conclusions:

    • The developed freeze-thaw protocol is effective for preserving islet viability and function.
    • This cryopreservation method is now being applied to human islets.
    • Low-temperature storage of human islets is crucial for advancing clinical islet transplantation.