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Updated: May 21, 2026
05:51
Observing Islet Function and Islet-Immune Cell Interactions in Live Pancreatic Tissue Slices
Published on: April 12, 2021
Optimizing post-transplantation detection of subcutaneously transplanted islets using dithizone staining.
James Lu1, Matthew Ishahak1, Marlie M Maestas1
1Division of Endocrinology, Metabolism and Lipid Research, Washington University School of Medicine, St. Louis, MO USA.
BMC Methods
|May 20, 2026
Summary
Dithizone staining effectively labels transplanted pancreatic islet grafts in mice, enabling precise localization and recovery. This method enhances subcutaneous islet transplantation research by providing a reliable tool for graft identification and analysis.
Area of Science:
- Endocrinology
- Cell Biology
- Transplantation Science
Background:
- Pancreatic islet transplantation aims to restore insulin independence in type 1 diabetes.
- Human pluripotent stem cell-derived islets show clinical promise but face challenges in site optimization and graft localization.
- The subcutaneous space is an accessible transplantation site, yet its utility is limited by poor vascularization and difficulty in locating grafts.
Purpose of the Study:
- To investigate the efficacy of dithizone staining for reliable localization of transplanted islet grafts within the subcutaneous space.
- To establish a standardized framework for evaluating subcutaneous islet transplantation using dithizone and automated islet quantification.
Main Methods:
- Stem cell-derived islets (SC-islets) and primary human islets were transplanted into immunodeficient mice.
- Automated islet equivalent quantification standardized islet volume prior to transplantation.
- Graft function was monitored via human C-peptide levels.
- Dithizone staining was applied to harvested tissue for graft localization, followed by immunohistochemical validation.
Main Results:
- Automated quantification ensured consistent islet dosing.
- Transplanted islets maintained function, evidenced by detectable human C-peptide.
- Dithizone staining clearly and selectively labeled insulin-producing β-cell grafts, enabling reliable localization and recovery.
- Immunohistochemistry confirmed insulin-expressing cells in isolated grafts.
Conclusions:
- Dithizone staining offers a rapid, cost-effective method for identifying subcutaneous islet grafts, overcoming a key research limitation.
- This technique, combined with standardized islet quantification, provides a reproducible framework for subcutaneous islet transplantation studies.
- Further research should explore dithizone's effects and applicability to other sites and imaging methods.
