Related Experiment Videos
Development of techniques for obtaining monodispersed human islet cells
M Peakman1, G L McNab, N D Heaton
1Department of Immunology, King's College School of Medicine and Dentistry, London, England.
Transplantation
|February 1, 1994
Summary
Researchers developed a method to isolate large quantities of functional human islet cells for type 1 diabetes treatment. This technique uses trypsin and EDTA, yielding abundant, viable cells suitable for transplantation and disease research.
Area of Science:
- Endocrinology
- Cell Biology
- Transplantation Science
Background:
- Type 1 diabetes requires beta cell replacement therapy.
- Current methods for obtaining human islet cells are insufficient for large-scale transplantation.
- Understanding islet cell immune interactions is crucial for disease pathogenesis studies.
Purpose of the Study:
- To develop efficient techniques for obtaining large quantities of monodispersed human islet cells.
- To optimize enzymatic and chemical digestion conditions for maximum yield and viability.
- To assess the functional integrity and surface marker expression of isolated human islet cells.
Main Methods:
- Human islets were isolated from organ donors via collagenase digestion.
- Various enzymatic (collagenases, trypsin, DNAse, hyaluronidase) and chemical (EDTA, EGTA) agents were tested.
- Cell yield, viability, insulin secretion, and MHC molecule expression were analyzed.
Main Results:
- Trypsin combined with EDTA yielded the highest number of monodispersed islet cells (963 cells/islet) with 88% viability.
- DNAse with EGTA produced high yields but lower viability (55%).
- Cells isolated using trypsin/EDTA maintained glucose-stimulated insulin secretion and intact surface MHC Class I molecules.
Conclusions:
- A robust method using trypsin and EDTA effectively produces abundant, functionally intact single human islet cells.
- These cells are suitable for islet cell transplantation to treat type 1 diabetes.
- The method provides a valuable substrate for studying the immune pathogenesis of type 1 diabetes.