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Computer-assisted Large-scale Visualization and Quantification of Pancreatic Islet Mass, Size Distribution and Architecture
Published on: March 4, 2011
Morphological changes of isolated rat pancreatic islets: a structural, ultrastructural and morphometric study
Sergio Morini1, Mark Braun, Paolo Onori
1Department of Biomedical Researches (CIR), University Campus Bio-Medico, Rome, Italy.
Journal of Anatomy
|August 25, 2006
Summary
Pancreatic islet isolation damages cells, impacting transplant success. Larger, intact islets improve graft function and diabetes reversal compared to fragmented ones, highlighting the importance of islet integrity.
Area of Science:
- Cell biology
- Transplantation immunology
- Endocrinology
Background:
- Pancreatic islet transplantation is a potential therapy for type 1 diabetes.
- Current isolation methods can damage islets, affecting their function and survival.
- Understanding the impact of isolation on islet structure and function is crucial for improving outcomes.
Purpose of the Study:
- To evaluate the structural integrity of isolated pancreatic islets.
- To correlate structural damage with islet function after transplantation.
- To identify factors influencing graft success in a rat model.
Main Methods:
- Rat pancreata were processed for islet isolation using Eurocollins-Ficoll density gradients.
- Islets were analyzed using light, scanning, and transmission electron microscopy.
- Islet function was assessed by reversing streptozotocin-induced diabetes and glucose tolerance tests.
Main Results:
- Isolated islets showed ultrastructural changes and significant peripheral cell damage (26% fragments).
- Transplantation of larger, more complete islets (higher islet equivalent/islet number ratio) resulted in better graft function.
- Poorer graft function and glycemic control were observed with smaller, fragmented islets (lower ratio).
Conclusions:
- Islet isolation procedures cause structural and functional damage.
- Incomplete islet integrity negatively impacts graft function and glycemic regulation.
- Optimizing isolation techniques to preserve islet structure is essential for successful islet transplantation.
