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Hepatic "stem" cells: coming full circle
1Department of Pathology, Stem Cell Program, University of Florida, Gainesville, FL 32610, USA. petersen@pathology.ufl.edu
Blood Cells, Molecules & Diseases
|August 3, 2001
Summary
Oval cells, crucial for liver repair after injury, can originate from bone marrow stem cells, not just the liver. This finding opens new avenues for studying liver regeneration and disease.
Area of Science:
- Hepatology
- Stem Cell Biology
- Gastroenterology
Background:
- Oval cells activate and proliferate following severe liver injury when hepatocyte regeneration is impaired.
- These cells serve as bipotential progenitors for hepatocytes and bile ductular cells.
- Oval cells are implicated in liver cancer development, but direct evidence is lacking.
Purpose of the Study:
- To investigate the origin and potential of oval cells.
- To explore the role of extrahepatic sources, specifically bone marrow, in oval cell generation.
- To establish a model for studying oval cell fate and physiology.
Main Methods:
- Utilizing sex-mismatched bone marrow transplantation in rodent models.
- Analyzing the contribution of bone marrow-derived cells to oval cell populations.
- Corroborating findings with human bone marrow cell differentiation studies.
Main Results:
- Clear evidence indicates that a fraction of hepatic oval cells can originate from bone marrow precursor cells in rodents.
- Human bone marrow cells have demonstrated the capacity to differentiate into hepatocytes and cholangiocytes.
- This supports the concept of extrahepatic origin for some oval cells.
Conclusions:
- Oval cells can arise from extrahepatic sources, including bone marrow.
- Sex-mismatched bone marrow transplantation provides a powerful tool to study oval cell origin and function.
- Further research can now address critical questions regarding oval cell physiology and their role in liver disease.