Decellularized Tissue Matrix Enhances Self-Assembly of Islet Organoids from Pluripotent Stem Cell Differentiation

Area of Science:

• Biomaterials Science
• Stem Cell Biology
• Endocrinology

Background:

• Regenerating human islet organoids from stem cells is challenging due to limited understanding of in vitro developmental cues.
• Existing methods struggle to replicate the complex microenvironment of native pancreatic islets.

Purpose of the Study:

• To investigate the potential of decellularized pancreatic extracellular matrix (dpECM) as a biomaterial for inducing human islet organoid self-assembly.
• To characterize the functionality and cellular composition of stem cell-derived islet organoids formed in the presence of dpECM.

Main Methods:

• Induced pluripotent stem cells (iPSCs) were differentiated in the presence of decellularized rat pancreatic extracellular matrix (dpECM).
• Characterization involved assessing hormone secretion (insulin, glucagon, somatostatin, pancreatic polypeptide), gene expression of key transcription factors (PDX-1, MAFA, NKX6.1), and tissue architecture.
• Glucose-responsive secretion assays were performed on the generated organoids.

Main Results:

• dpECM successfully induced the self-assembly of human islet organoids from iPSCs.
• The iPSC-derived organoids exhibited glucose-responsive secretion of insulin and glucagon.
• Organoids comprised all major endocrine cell types (α, β, δ, PP) organized similarly to native human islets, with elevated expression of key pancreatic transcription factors.

Conclusions:

• Natural bioactive biomaterials like dpECM are crucial for creating microenvironments that support the regeneration of functional islet organoids from stem cells.
• This approach represents a significant advancement in generating stem cell-derived endocrine organoids for potential therapeutic applications in diabetes.
• The study underscores the importance of the extracellular matrix in directing stem cell differentiation and tissue formation.