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Related Experiment Video

Updated: Apr 28, 2026

Scaffold-supported Transplantation of Islets in the Epididymal Fat Pad of Diabetic Mice
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Two-layer challenge test as an assessment to predict islet graft function.

Tadahiro Goto, Yasuhiro Fujino, Masaru Kanashiro

    Hepato-Gastroenterology
    |June 6, 2014
    PubMed
    Summary
    This summary is machine-generated.

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    31P-NMR spectroscopy combined with a two-layer storage method (TLM) effectively assesses islet graft viability before transplantation. This method distinguishes viable from non-viable islet grafts, crucial for successful transplantation outcomes.

    Area of Science:

    • Transplantation immunology
    • Biochemistry
    • Medical imaging

    Background:

    • Assessing islet graft viability before transplantation is critical for successful outcomes.
    • Current methods for assessing graft viability can be time-consuming or lack objectivity.
    • Developing rapid and reliable methods for pre-transplant graft assessment is essential.

    Purpose of the Study:

    • To evaluate the efficacy of 31P-Nuclear Magnetic Resonance (NMR) spectroscopy combined with a two-layer storage method (TLM) for assessing islet graft viability.
    • To determine if 31P-NMR spectroscopy can differentiate between viable and non-viable islet grafts prior to transplantation.
    • To correlate 31P-NMR spectroscopy findings with islet yield and in vivo function.

    Main Methods:

    • Rat pancreases were subjected to varying durations of warm ischemia (WI) before islet isolation.

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  • Isolated pancreatic tissues were preserved using the two-layer storage method (TLM).
  • 31P-NMR spectroscopy was employed to measure adenosine triphosphate (ATP) levels, specifically the beta-adenosine triphosphate to phosphate monoester (betaATP/PME) ratio, in preserved islet tissues.

    • Main Results:

    • A significant difference in betaATP/PME ratios was observed between control (0 min WI) and ischemic (30 min WI) groups (0.11 +/- 0.04 vs. 0.03 +/- 0.01, P < 0.05).
    • Islet yields were significantly reduced in the ischemic group.
    • Transplantation of islets from the ischemic group resulted in a 0% cure rate in nude mice, while islets from the control group achieved a 100% cure rate, clearly distinguishing viable from non-viable grafts based on betaATP/PME ratios.

    Conclusions:

    • 31P-NMR spectroscopy combined with TLM offers an objective and rapid method for assessing islet graft damage before transplantation.
    • The betaATP/PME ratio derived from 31P-NMR spectroscopy can reliably distinguish between viable and non-viable islet grafts.
    • This technique holds promise for improving pre-transplant graft selection and enhancing transplantation success rates.