Liver Regeneration Mechanisms and Therapeutic Strategies

The liver’s remarkable capacity to restore mass and function following injury is underpinned by a tightly orchestrated series of cellular and molecular events. In the acute setting, mature hepatocytes re-enter the cell cycle in response to a priming phase driven by cytokines such as interleukin-6 and tumour necrosis factor-α. Growth factor signalling through receptors for hepatocyte growth factor and epidermal growth factor then propels hepatocytes through the proliferative phase. Termination signals ensure that liver mass returns to homeostatic levels once regeneration is complete. In chronic or severe injury, when hepatocyte proliferation is impaired, biliary epithelial cells and facultative progenitors can transdifferentiate into hepatocytes, providing an auxiliary mechanism for tissue replacement. Spatial heterogeneity or zonation effects further influence regenerative capacity, with periportal and pericentral hepatocyte populations exhibiting distinct contributions under different injury contexts. Therapeutic strategies now aim to harness these intrinsic mechanisms. Small-molecule modulators of Wnt/β-catenin and PI3K–AKT–mTOR pathways seek to enhance progenitor activation or hepatocyte proliferation. Bioengineering approaches, including organoid cultures of liver progenitor-like cells, offer platforms for drug testing and potential cell-based therapies. Understanding the crosstalk between parenchymal and non-parenchymal compartments, and the impact of metabolic reprogramming on regenerative outcome, is guiding precision interventions to improve recovery after hepatic resection, transplantation or chronic liver disease.

Research from Nature Portfolio

Recent studies have revealed that chronic metabolic dysfunction induces profound plasticity within the human liver. Single-nucleus RNA sequencing combined with three-dimensional imaging has uncovered a loss of classical zonation and extensive reorganisation of biliary and hepatocyte compartments. Crucially, these investigations demonstrate direct transdifferentiation events between mature hepatocytes and cholangiocytes, independent of canonical stem cell niches, and identify insulin-linked activation of PI3K–AKT–mTOR as a central regulator of this plasticity. Another major advance has been the characterisation of bipotent transitional liver progenitor cells that arise from biliary epithelial cells following severe injury. Genetic lineage tracing in animal models shows that these progenitors can adopt either hepatocyte or biliary fates, a process orchestrated by sequential Notch and Wnt/β-catenin signalling. These findings elucidate an auxiliary regeneration pathway that can be leveraged when conventional hepatocyte replication is compromised, and suggest molecular targets for enhancing progenitor-mediated repair.

Liver Regeneration Mechanisms and Therapeutic Strategies publication trend

The graph below shows the total number of articles in liver regeneration mechanisms and therapeutic strategies across all publications each year (not limited to Nature Index journals).

Technical terms

Hepatocyte: The primary parenchymal cell of the liver responsible for metabolism and regeneration.

Cholangiocyte: A biliary epithelial cell lining intrahepatic bile ducts, capable of progenitor functions.

Transdifferentiation: The direct conversion of one differentiated cell type into another without a pluripotent intermediate.

Organoid: A three-dimensional multicellular structure grown in vitro that mimics aspects of organ function.

Zonation: Spatial heterogeneity of hepatocyte function along the liver lobule.

Lineage tracing: A technique used to track the progeny of specific cells over time in vivo.

References

1. Acquisition of epithelial plasticity in human chronic liver disease. Nature (2024).
2. Bipotent transitional liver progenitor cells contribute to liver regeneration. Nature Genetics (2023).
3. Expansion and differentiation of human hepatocyte-derived liver progenitor-like cells and their use for the study of hepatotropic pathogens. Cell Research (2018).
4. Liver Regeneration: Analysis of the Main Relevant Signaling Molecules. Mediators of Inflammation (2017).
5. Liver Regeneration after Hepatectomy and Partial Liver Transplantation. International Journal of Molecular Sciences (2020).
6. Hepatocyte‐Specific β‐Catenin Deletion During Severe Liver Injury Provokes Cholangiocytes to Differentiate Into Hepatocytes. Hepatology (2019).