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Generation of a Humanized Mouse Liver Using Human Hepatic Stem Cells
Published on: August 29, 2016
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The development of humanized liver with Rag1 knockout rats
T Tsuchida1, Y-W Zheng1, R-R Zhang1
1Department of Regenerative Medicine, Graduate School of Medicine, Yokohama City University, Yokohama, Kanagawa, Japan.
Transplantation Proceedings
|May 13, 2014
Summary
Researchers developed a novel immunodeficient rat model for a humanized liver. This model shows promise for preclinical drug testing by achieving significant liver repopulation with human hepatocytes.
Area of Science:
- Hepatology
- Immunology
- Preclinical drug development
Background:
- Humanized liver models are crucial for preclinical drug metabolism and toxicity studies.
- Existing mouse models achieve high human hepatocyte repopulation, but rat models lag behind.
- Developing a robust humanized liver rat model is a significant unmet need.
Purpose of the Study:
- To establish a novel, severely immunodeficient rat model for achieving a humanized liver.
- To overcome limitations in current rat models for liver repopulation with human hepatocytes.
Main Methods:
- Rag1 knockout rats underwent neonatal thymectomy to deplete T-lymphocytes.
- Hepatotoxin (retrorsine) treatment followed by partial hepatectomy created a permissive liver environment.
- Immature human hepatocytes were transplanted via portal vein, with immunosuppression using anti-asialo GM1 and FK506.
Main Results:
- Combined thymectomy and anti-asialo GM1 treatment significantly reduced B, T, and NK lymphocytes.
- Human hepatocyte transplantation resulted in approximately 17% liver repopulation by week 3.
- Expression of human hepatocyte-specific genes (albumin, CYP3A4, CYP2C18, CYP2C9) was detected in the recipient rat liver.
Conclusions:
- A novel, severely immunodeficient rat model capable of supporting a humanized liver has been successfully generated.
- This model represents a significant advancement for preclinical research, particularly in drug metabolism and toxicity testing.
