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Updated: Jul 13, 2026
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Pancreatic Islet Isolation and Purification from Lewis Rats Using Enzymatic Digestion and Density-Gradient Separation
Published on: April 3, 2026
Rat pancreatic islet size standardization by the "hanging drop" technique
G Cavallari1, R A Zuellig, R Lehmann
1Department of Surgery, Intensive Care and Transplantation, S Orsola-Malpighi Hospital, University of Bologna, Italy. giuseppe_cavallari@yahoo.it
Transplantation Proceedings
|August 19, 2007
Summary
Researchers developed a new method to create small, uniform pancreatic "pseudoislets" from single cells. This technique improves islet transplantation by potentially reducing immune rejection and enhancing graft function.
Area of Science:
- Regenerative Medicine
- Transplantation Biology
- Cell Biology
Background:
- Islet transplantation faces challenges from immune rejection and hypoxia.
- Graft function is inversely related to islet size, favoring smaller islets.
- Pancreatic islets can be dissociated into single cells and reaggregated into pseudoislets with reduced immunogenicity.
Purpose of the Study:
- To develop a technique for producing pseudoislets of defined, small dimensions.
- To optimize pseudoislet formation for improved islet transplantation outcomes.
Main Methods:
- Islets were harvested from Lewis rats and dissociated into single cells using trypsin digestion.
- Single cells were aggregated into pseudoislets using a "hanging drop" culture method over 5-8 days.
- Pseudoislets were analyzed for size, morphology, and cellular composition.
Main Results:
- Pseudoislet volume strongly correlated with cell number (r² = .995).
- The average diameter of a 250-cell pseudoislet was 95 ± 8 µm, smaller than native islets (122 ± 46 µm).
- Pseudoislet morphology, cellular composition, and architecture were comparable to intact islets.
Conclusions:
- The hanging drop method successfully produced standardized, regularly shaped pseudoislets.
- Further research is needed to minimize cell loss and evaluate in vivo function of transplanted pseudoislets.
