Human hepatocyte isolation and transplantation into an athymic rat, using prevascularized cell polymer constructs

Area of Science:

• Hepatology
• Biomaterials Science
• Tissue Engineering

Background:

• Human liver cell transplantation is a potential therapy for liver failure.
• Developing effective methods for hepatocyte engraftment and function in vivo is crucial.

Purpose of the Study:

• To assess the viability and function of human hepatocytes transplanted into athymic rats on prevascularized polymer constructs with hepatotrophic stimulation.
• To evaluate the feasibility of a novel technique for liver cell transplantation.

Main Methods:

• Human liver biopsy specimens were used to create cell suspensions.
• Cell suspensions underwent in vitro assessment for attachment and viability.
• Hepatocytes were transplanted into athymic rats using prevascularized polymer devices.
• Histological and morphometric analyses were performed to assess engraftment and tissue organization.
• Immunoperoxidase staining was used to detect albumin as a marker of hepatocyte function.

Main Results:

• In vitro studies showed 40% cell attachment after 24 hours, with variable cell number changes over 4 days depending on patient age.
• In vivo, transplanted hepatocytes were observed within the polymer device up to 21 days post-transplantation.
• Reorganized hepatic parenchyma was evident by day 9 after transplantation.
• Morphometric analysis revealed a 36% increase in engraftment at day 3, followed by a 42% decrease at day 7.
• Intracellular albumin was detected, confirming the function of implanted hepatocytes.

Conclusions:

• The study demonstrates the feasibility of using prevascularized polymer devices with hepatotrophic stimulation for human hepatocyte transplantation.
• The technique shows potential for future clinical applications in liver disease treatment.
• Further research is required before human clinical trials can be implemented.