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Isolation of CD133+ Liver Stem Cells for Clonal Expansion
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Stem cells and liver regeneration.

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The liver maintains its size by balancing regeneration and overgrowth. This review examines the controversial role of liver stem cells in regeneration, considering various definitions.

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Area of Science:

  • Hepatology and stem cell biology.

Background:

  • The liver possesses a remarkable ability to maintain a constant size despite significant injury.
  • Mammals can regenerate up to 75% of their liver mass within a week after resection.
  • Liver size is tightly regulated, balancing regeneration with controlled overgrowth.

Purpose of the Study:

  • To review the role of liver stem cells in liver regeneration.
  • To address the controversy surrounding liver stem cell definitions and functions.

Main Methods:

  • The review analyzes liver stem cells based on five distinct definitions.
  • Consideration of cells involved in normal tissue turnover, regeneration after partial hepatectomy, progenitor-dependent regeneration, in vitro phenotype generation, and liver repopulation.

Main Results:

  • The precise molecular signals governing liver size maintenance are not fully understood.
  • Multiple definitions of hepatic stem cells contribute to the ongoing debate regarding their role in regeneration.

Conclusions:

  • Clarifying the definition and function of liver stem cells is crucial for understanding liver regeneration.
  • Further research is needed to reconcile the various proposed roles of liver stem cells in maintaining liver homeostasis.