Functionalized peptide hydrogel to generate human insulin-producing cells in vitro

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Stem Cell Biology

Background:

• Type I diabetes requires insulin therapy, but pancreatic islet transplantation faces donor scarcity and risks.
• Self-assembling peptide hydrogels (SAPHs) are promising biomaterials for tissue engineering and cell delivery.
• Functionalizing SAPHs with extracellular matrix (ECM) motifs may enhance their utility for regenerative applications.

Purpose of the Study:

• To investigate the potential of ECM-functionalized SAPH (FEK9) in supporting the differentiation of human dental pulp stem cells (hDPSCs) into insulin-producing cells (IPCs).

Main Methods:

• FEFEFKFKK (FEK9) peptide hydrogels were functionalized with ECM motifs (RGD, GFOGER, IKVAV).
• Characterization of ECM-FEK9 hydrogels using infrared spectroscopy and rheology.
• Culturing hDPSCs within the ECM-FEK9 hydrogel and inducing differentiation towards IPCs.
• Assessing cell viability, metabolism, and expression of key β-cell markers (PDX-1, Glut-2) and insulin production.

Main Results:

• ECM-FEK9 hydrogels formed a stable β-sheet secondary structure and a nanofibrillar network.
• hDPSCs maintained viability and metabolic activity within the hydrogel.
• Cells cultured in ECM-FEK9 expressed PDX-1 and Glut-2, and synthesized insulin within 10 days.
• Successful generation of insulin-producing cells (IPCs) in a 3D culture environment.

Conclusions:

• ECM-functionalized FEK9 hydrogels show promise for culturing hDPSCs and generating IPCs.
• This approach offers a potential alternative for cell-based therapies in type I diabetes.
• Further refinement of directed induction protocols within 3D culture is warranted.