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Hepatic Progenitor Specification from Pluripotent Stem Cells using a Defined Differentiation System
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Published on: May 10, 2020

Progenitor cell characterization and location in the developing human liver.

John D Terrace1, Ian S Currie, David C Hay

  • 1Centre for Regenerative Medicine, University of Edinburgh Medical School, EH16 4SB, Edinburgh, United Kingdom.

Stem Cells and Development
|November 15, 2007
PubMed
Summary

Researchers identified novel stem cell populations in the developing human liver. These findings advance understanding of hepatic progenitor cell maturation and could inform future liver disease therapies.

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Published on: February 18, 2017

Area of Science:

  • Developmental biology
  • Stem cell research
  • Hepatology

Background:

  • Tissue-derived stem cells show promise for liver disease therapies.
  • The developing human liver is a key model for studying hepatic progenitor cell maturation.
  • Candidate progenitor cell populations in the early human liver are poorly characterized.

Purpose of the Study:

  • To identify potential progenitor cell phenotypes in the first-trimester human liver.
  • To characterize the architectural relationships among developing epithelial, mesenchymal, and hematopoietic lineages.
  • To discover novel markers for hepatic progenitor cells.

Main Methods:

  • Immunohistochemical analysis of first-trimester human liver tissue.
  • Characterization of co-expression patterns for specific lineage markers (cytokeratin 18, albumin, cytokeratin 19, E-cadherin, dlk/pref-1, Thy-1, CD34, vimentin).
  • Architectural mapping of epithelial, mesenchymal, and hematopoietic cell interactions.

Main Results:

  • Bipotential hepatoblasts were identified by co-expression of hepatocytic and biliary markers, along with E-cadherin.
  • dlk/pref-1 expression was restricted to hepatoblasts, serving as a novel marker for their isolation.
  • Thy-1, a liver stem cell and hematopoietic marker, was co-expressed with hematopoietic (CD34) and mesenchymal (vimentin) markers on portal vein endothelium, suggesting a hemangioblast-like progenitor compartment.

Conclusions:

  • Novel markers, including dlk/pref-1, were identified for characterizing and isolating hepatoblasts.
  • The portal vein endothelium may represent a previously unrecognized progenitor compartment with hemangioblast-like properties.
  • Understanding these early progenitor populations is crucial for developing future stem cell-based liver disease therapies.