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Updated: Apr 26, 2026

Differentiation of Human Pluripotent Stem Cells into Insulin-Producing Islet Clusters
Published on: June 23, 2023
Improved human islet preparations using glucocorticoid and exendin-4.
Atsushi Miki1, Camillo Ricordi, Toshiyuki Yamamoto
1From the *Cell Transplant Center, Diabetes Research Institute, †DeWitt Family Department of Surgery, ‡Jackson Memorial Hospital Transplant Institute, §Department of Microbiology and Immunology, and ∥Department of Medicine, University of Miami Leonard M. Miller School of Medicine, Miami, FL; and ¶Department of Surgery and Medicine, University of California Irvine, Orange, CA.
Methylprednisolone (MP) and Exendin-4 (EX) improve human islet cell survival during culture. MP reduces inflammatory cytokines, while EX preserves insulin secretion, suggesting their combined use enhances islets for transplantation.
Area of Science:
- Endocrinology
- Transplantation Biology
- Cell Culture
Background:
- Glucocorticoid effects on human islet cells in culture are debated.
- Exendin-4 (EX) is known to enhance insulin secretion and improve islet transplantation outcomes.
Purpose of the Study:
- To investigate the combined effects of glucocorticoids (methylprednisolone, MP) and EX on human islet cells during pretransplant culture.
Main Methods:
- Human islets were cultured for 24 hours with MP and/or EX.
- Evaluated parameters included beta-cell viability, cellular composition, cytokine/chemokine production, protein phosphorylation, and glucose-induced insulin secretion.
Main Results:
- MP and MP + EX significantly increased viable beta-cell survival compared to controls.
- EX counteracted MP-induced reduction in insulin secretion.
- MP decreased cytokine and chemokine production, and increased extracellular signal-regulated kinase 1/2 (ERK1/2) phosphorylation.
Conclusions:
- MP supplementation enhances human beta-cell survival by reducing inflammation and increasing ERK1/2 phosphorylation.
- EX preserves insulin secretion suppressed by MP.
- Combined MP and EX treatment offers a promising strategy for preparing human islets for transplantation.
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