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A stereotypic, transplantable liver tissue-culture system
B A Naughton1, B Sibanda, J P Weintraub
1Hematology Laboratory, Advanced Tissue Sciences Inc., La Jolla CA 92037, USA.
Applied Biochemistry and Biotechnology
|July 1, 1995
Summary
This study developed a method for coculturing rat liver cells on 3D scaffolds. These engineered liver tissues demonstrated sustained function and regenerated liver-like structures after transplantation, offering potential for liver repair.
Area of Science:
- Hepatology and Regenerative Medicine
- Tissue Engineering
- Cell Biology
Background:
- Hepatocellular dysfunction and liver failure necessitate innovative therapeutic strategies.
- Current treatments for liver disease have limitations, driving research into bioengineered alternatives.
- Coculture systems and three-dimensional scaffolds show promise for maintaining hepatocyte function.
Purpose of the Study:
- To develop a method for coculturing adult rat hepatic parenchymal cells (PC) and stromal cells in a 3D framework.
- To evaluate the long-term proliferation, function, and viability of these cocultures in vitro.
- To assess the potential of these engineered liver tissues for transplantation and functional restoration in vivo.
Main Methods:
- Isolation and expansion of rat liver stromal cells, followed by seeding onto nylon or biodegradable polyglycolic acid (PGA) polymer scaffolds.
- Coculture of established stromal cells with freshly isolated hepatic parenchymal cells in a 3D configuration.
- In vitro assessment of cell proliferation, morphology, cytochrome P450 activity, and protein synthesis (albumin, fibrinogen, etc.).
- In vivo transplantation of PGA-based cocultures into rat models, followed by histological and immunohistochemical analysis.
Main Results:
- Hepatic parenchymal cells proliferated extensively within the 3D scaffold, forming multiple layers and maintaining rounded morphology.
- Cocultures exhibited sustained liver-specific functions, including detectable cytochrome P450 activity and secretion of albumin, fibrinogen, transferrin, and fibronectin for extended periods.
- Transplanted PGA constructs successfully regenerated liver-like architecture in vivo, with hepatocytes synthesizing key liver proteins at extrahepatic graft sites.
- Graft survival and regeneration were enhanced in partially hepatectomized recipients.
Conclusions:
- The developed 3D coculture system effectively supports long-term proliferation and function of rat hepatic parenchymal and stromal cells.
- The engineered liver tissue demonstrates regenerative capacity and functional protein synthesis upon transplantation.
- This hepatic coculture approach holds significant potential for therapeutic applications in liver disease, either via direct transplantation or as extracorporeal devices.