A simplified approach to human islet quality assessment.

Area of Science:

• Cell Biology
• Transplantation Immunology
• Endocrinology

Background:

• Islet transplantation is a key treatment for type 1 diabetes, but its success hinges on high-quality donor tissue.
• Current methods for assessing islet quality lack the sensitivity and objectivity needed for reliable pretransplant evaluation.
• Improved assays are crucial for determining islet viability and potency before transplantation.

Purpose of the Study:

• To validate novel assays for human islet quality assessment.
• To develop a simplified scoring system for predicting islet function in vivo.
• To enhance islet transplantation outcomes through objective quality control.

Main Methods:

• Screened 42 human islet preparations using standard and novel techniques.
• Assessed islet viability, apoptosis, mitochondrial membrane potential (MMP), and adenine nucleotide levels.
• Measured glucose-stimulated insulin secretion (GSIS) in vitro and in vivo functional potency in immunodeficient mice.

Main Results:

• Potent islet preparations exhibited higher MMP, ATP-to-ADP ratios, and GSIS.
• A combined scoring formula integrating MMP, ATP-to-ADP ratio, and GSIS achieved over 86% accuracy in predicting in vivo function.
• Objective multiparametric data proved predictive of transplant success.

Conclusions:

• A multiparametric assessment of islet cell mitochondrial integrity and in vitro function predicts in vivo performance.
• This novel scoring system offers objective, reliable data for islet quality control.
• The findings support improved islet quality assessment for enhanced transplantation outcomes.