Related Experiment Video
Updated: May 16, 2026
Generation of a Humanized Mouse Liver Using Human Hepatic Stem Cells
Published on: August 29, 2016
Human pharmacogenetic analysis in chimeric mice with 'humanized livers'
Yajing Hu1, Manhong Wu, Toshihiko Nishimura
1Department of Anesthesia, Stanford University School of Medicine, Stanford, California 94305, USA.
Objective:
We investigated whether human pharmacogenetic factors could be characterized using chimeric NOG mice expressing a thymidine kinase transgene (TK-NOG) with 'humanized' livers.
Materials And Methods:
The rate of human-specific metabolism of two drugs was measured in chimeric mice reconstituted with human hepatocytes with different CYP2C19 and CYP2C9 genotypes.
Results:
The rate of generation of human-predominant drug metabolites for S-mephenytoin and diclofenac in the chimeric mice was correlated with the CYP2C19 (n=9 donors, P=0.0005) or CYP2C9 (n=7 donors, P=0.0394) genotype, respectively, of the transplanted human hepatocytes.
Conclusion:
This study suggests that TK-NOG mice reconstituted with hepatocytes obtained from a relatively small number (3-10 per genotype) of human donors may be a promising model to identify human pharmacogenetic factors affecting the metabolism of clinically important drugs. For certain compounds, this innovative model system enables pharmacogenetic analyses to be efficiently performed in vivo within a human context and with control of all confounding environmental variables.
Insights
Humanized liver mice (TK-NOG) can identify pharmacogenetic factors influencing drug metabolism. This model efficiently analyzes drug metabolism in vivo, correlating genetic variations with metabolite production.
Area of Science:
- Pharmacogenetics
- Drug Metabolism
- Animal Models
Background:
- Understanding human pharmacogenetics is crucial for personalized medicine.
- Existing models often fail to fully replicate human drug metabolism.
- Chimeric mice with humanized livers offer a potential solution.
Purpose of the Study:
- To evaluate TK-NOG mice with humanized livers for characterizing human pharmacogenetic factors.
- To assess the model's ability to predict drug metabolism based on genetic variations.
Main Methods:
- Chimeric NOG mice expressing a thymidine kinase transgene (TK-NOG) were used.
- Mice were reconstituted with human hepatocytes possessing distinct CYP2C19 and CYP2C9 genotypes.
- Human-specific metabolism rates of S-mephenytoin and diclofenac were quantified.
Main Results:
- Metabolite generation rates for S-mephenytoin correlated with CYP2C19 genotype (P=0.0005).
- Diclofenac metabolite generation rates correlated with CYP2C9 genotype (P=0.0394).
- Results demonstrate a link between hepatocyte genotype and drug metabolism in vivo.
Conclusions:
- TK-NOG mice with humanized livers represent a promising model for pharmacogenetic studies.
- The model allows efficient in vivo analysis of drug metabolism within a human context.
- This system aids in identifying genetic factors influencing drug response with controlled variables.
