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Efficient Differentiation of Human Pluripotent Stem Cells into Liver Cells
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Improving the repopulation capacity of elderly human hepatocytes by decoding aging-associated hepatocyte plasticity
Yun-Zhong Nie1,2, Yun-Wen Zheng1,3,4,5,6, Hideki Taniguchi1,2,7
1Department of Regenerative MedicineYokohama City University Graduate School of MedicineYokohamaKanagawaJapan.
Hepatology (Baltimore, Md.)
|March 4, 2022
Summary
Liver regeneration declines with age due to impaired hepatocyte plasticity. This study reveals age-induced histone hypoacetylation as the cause, suggesting histone deacetylase inhibition as a therapeutic target to restore liver function in the elderly.
Area of Science:
- Hepatology
- Aging research
- Stem cell biology
Background:
- Liver regenerative capacity significantly diminishes with advanced age.
- Current therapeutic strategies for improving liver regeneration in elderly individuals are limited due to an incomplete understanding of aging mechanisms.
- Hepatocyte plasticity is crucial for generating new hepatocytes and cholangiocytes during liver regeneration.
Purpose of the Study:
- To investigate the mechanisms regulating aging-associated decline in human hepatocyte plasticity.
- To identify potential therapeutic targets for enhancing liver regeneration in the elderly population.
Main Methods:
- Development of a human-induced pluripotent stem cell-derived hepatocyte aging model.
- Ex vivo characterization of hepatocyte plasticity in aging models.
- Assessment of histone acetylation patterns and histone deacetylase activity.
- In vivo evaluation of therapeutic interventions in a liver injury model.
Main Results:
- Hepatocyte plasticity progressively decreases with age.
- Age-induced histone hypoacetylation was identified as a key factor impairing hepatocyte plasticity.
- Selective inhibition of histone deacetylases effectively restored plasticity in aged hepatocytes.
- Enhanced plasticity of elderly primary human hepatocytes improved their repopulation capacity in a liver injury model.
Conclusions:
- Age-induced histone hypoacetylation is a critical mechanism underlying the loss of hepatocyte plasticity.
- Hepatocyte plasticity represents a promising therapeutic target for rejuvenating the regenerative capacity of aging livers.
- Targeting histone deacetylases offers a potential strategy to improve liver regeneration in elderly patients.
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