Liver Regeneration Using Cultured Liver Bud.

Area of Science:

• Stem Cell Biology
• Developmental Biology
• Tissue Engineering

Background:

• Human induced pluripotent stem cells (iPSCs) hold promise for regenerative medicine.
• Developing functional liver tissue in vitro remains a significant challenge.
• Existing models often lack the complexity of native liver development.

Purpose of the Study:

• To establish a protocol for generating three-dimensional (3D) liver bud-like tissue from human iPSCs.
• To create a reproducible in vitro model for studying liver development and disease.
• To provide a platform for drug screening and potential future clinical applications.

Main Methods:

• Human iPSCs were differentiated into definitive endoderm (DE) and then hepatic endoderm (HE) cells in 2D culture.
• iPSC-derived HE cells were co-cultured with endothelial and mesenchymal cells on Matrigel-coated plates or micropatterned surfaces.
• The co-culture system facilitated rapid cell condensation to form 3D tissue masses.

Main Results:

• The generated 3D tissue masses, termed iPSC liver buds (iPSC-LBs), successfully mimicked developmental liver buds.
• Gene expression, cell proliferation, and cell proportions within iPSC-LBs resembled those of in vivo embryonic liver buds.
• The protocol demonstrated efficient generation of 3D liver bud-like structures.

Conclusions:

• The developed iPSC-LB culture system provides a robust method for generating functional liver tissue in vitro.
• This model serves as a valuable tool for investigating human liver development and disease mechanisms.
• The iPSC-LB system has significant potential for drug development and future therapeutic strategies.