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Related Experiment Video

Updated: Jan 18, 2026

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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.

Biorxiv : the Preprint Server for Biology
|January 16, 2026
PubMed
Summary
This summary is machine-generated.

Dithizone staining effectively locates transplanted pancreatic islet grafts in the subcutaneous space of mice, aiding type 1 diabetes research. This method improves graft localization and recovery for future therapeutic advancements.

Keywords:
DiabetesDithizone StainingIslet TransplantationSC-islets

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Area of Science:

  • Endocrinology
  • Cell Biology
  • Transplantation Science

Background:

  • Pancreatic islet transplantation aims to restore insulin independence in type 1 diabetes mellitus.
  • Human pluripotent stem cell-derived islets (SC-islets) show clinical promise.
  • Optimizing transplantation sites and graft localization are key challenges.

Purpose of the Study:

  • To investigate dithizone staining for reliable localization of transplanted islet grafts in the subcutaneous space of murine models.
  • To address limitations in standardized islet dosing and post-transplant graft localization.

Main Methods:

  • SC-islets and primary human islets were generated and functionally validated.
  • Islet volume was standardized using automated islet equivalent quantification.
  • Islets were transplanted into the subcutaneous space of immunodeficient mice.
  • Graft function was assessed via blood glucose monitoring, glucose tolerance testing, and C-peptide measurements.
  • Dithizone staining and immunohistochemistry were used for graft localization and validation.

Main Results:

  • Automated quantification ensured consistent islet dosing.
  • Transplanted islets maintained function in vivo, evidenced by improved glycemic control and C-peptide detection.
  • Dithizone staining provided clear, selective labeling of β-cell grafts, enabling reliable localization and recovery.
  • Immunohistochemistry confirmed insulin-expressing cells within isolated grafts.

Conclusions:

  • Dithizone staining offers a rapid, cost-effective method for identifying subcutaneous islet grafts.
  • This technique addresses a significant limitation in islet transplantation research.
  • Combined with standardized islet quantification, it provides a reproducible framework for evaluating subcutaneous islet transplantation.