Human cord blood-derived cells can differentiate into hepatocytes in the mouse liver with no evidence of cellular fusion

Philip N Newsome, Ingólfur Johannessen, Shelagh Boyle, Evangelos Dalakas, Karen A McAulay, Kay Samuel, Frances Rae, Lesley Forrester, Marc L Turner, Peter C Hayes, David J Harrison, Wendy A Bickmore, John N Plevris

Research output: Contribution to journalArticlepeer-review

Abstract

BACKGROUND & AIMS: Studies have indicated that stem cells have unexpected plasticity and can differentiate down a multitude of nonhematopoietic cell lineages in rodents. Our aim was to identify whether human cord blood cells, which are a rich source of stem cells, would be able to differentiate into hepatocytes when infused into nonobese diabetic-severe combined immunodeficient (NOD-SCID) mice. We also wanted to test whether such differentiated cells were the result of cellular fusion or true stem cell transdifferentiation.

METHODS: Unsorted mononuclear cell preparations of human cord blood were infused into sublethally irradiated NOD-SCID mice. After death, immunohistologic analysis of murine livers was performed using human specific hepatocyte, biliary, and endothelial markers. Fluorescent in situ hybridization (FISH) for mouse and human DNA was also performed.

RESULTS: We show that human cord blood cells have the ability to engraft into NOD-SCID liver and become mature hepatocytes. We were unable to identify any biliary or endothelial differentiation. Furthermore, we do not detect any evidence of cell fusion in any of the human cells found in the mouse liver, suggesting that human cord blood cells are capable of true transdifferentiation into hepatocytes in vivo.

CONCLUSIONS: We conclude that hepatocytes can derive from human cord blood cells when infused into NOD-SCID mice in the absence of fusion. The demonstration that human stem cell differentiation can occur in this murine model permits comprehensive study of human stem cell plasticity in vivo.

Original languageEnglish
Pages (from-to)1891-1900
Number of pages10
JournalGastroenterology
Volume124
Issue number7
DOIs
Publication statusPublished - Jun 2003

Keywords

  • Animals
  • Cell Differentiation
  • Cell Fusion
  • Fetal Blood
  • Hematopoietic Stem Cells
  • Hepatocytes
  • Humans
  • Mice
  • Mice, Inbred NOD
  • Mice, SCID

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