Long-term differentiated function of heterotopically transplanted hepatocytes on three-dimensional polymer matrices

Area of Science:

• Hepatology
• Biomaterials Science
• Regenerative Medicine

Background:

• Hepatocyte transplantation is a potential therapy for liver diseases.
• Long-term function of transplanted hepatocytes is crucial but understudied.
• Porous matrices are being explored to support hepatocyte engraftment.

Purpose of the Study:

• To investigate the long-term engraftment and function of transplanted hepatocytes within 3D porous matrices.
• To evaluate the impact of stimulation on hepatocyte survival and function post-transplantation.
• To assess the suitability of polyvinyl-alcohol matrices for supporting liver cell repopulation.

Main Methods:

• Lewis rats were used as donors and recipients.
• Hepatocytes were transplanted into prevascularized polyvinyl-alcohol matrices (stimulated vs. unstimulated).
• Matrices were analyzed from 1 hour to 1 year post-implantation using morphometry and immunohistology.

Main Results:

• Hepatocyte numbers decreased initially but significantly increased between 1 month and 1 year in stimulated and unstimulated groups.
• Albumin transcript levels remained normal, except in unstimulated cells at 1 year.
• Immunohistology indicated engraftment of nonparenchymal liver cells.

Conclusions:

• 3D matrices provide a suitable environment for long-term hepatocyte engraftment.
• Transplanted hepatocytes can repopulate scaffolds and maintain function for extended periods.
• Stimulation appears beneficial for sustained hepatocyte function.