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Hematopoietic commitment during embryonic stem cell differentiation in culture

G Keller1, M Kennedy, T Papayannopoulou

  • 1National Jewish Center, Denver, Colorado 80206.

Molecular and Cellular Biology
|January 1, 1993
PubMed
Summary
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Embryonic stem cells differentiate into mesoderm and hematopoietic cells in vitro, mirroring early mouse development. This system provides insights into hematopoietic stem cell development and gene expression patterns.

Area of Science:

  • Developmental Biology
  • Stem Cell Biology
  • Hematopoiesis

Background:

  • Embryonic stem cells (ESCs) offer a model for studying early development.
  • Hematopoiesis, the formation of blood cells, is a complex process crucial for development.

Purpose of the Study:

  • To investigate the in vitro differentiation of ESCs into hematopoietic cells.
  • To establish an in vitro system that recapitulates early mouse hematopoietic development.
  • To analyze gene expression patterns and growth factor dependency during early hematopoiesis.

Main Methods:

  • Differentiation of ESCs into embryoid bodies (EBs).
  • Comparative reverse transcriptase-mediated polymerase chain reaction (RT-PCR) for gene expression analysis.
  • Assessment of hematopoietic precursor development and growth factor responsiveness.

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Main Results:

  • ESCs efficiently differentiate into mesoderm and hematopoietic cells in vitro, recapitulating mouse embryonic hematopoiesis (days 6.5-7.5).
  • Erythroid precursors emerge by day 4, with over 85% of EBs containing these cells by day 6.
  • Gene expression profiles of key developmental markers (collagen alpha IV, Brachyury, GATA-1, GATA-3, vav) in EBs parallel those in early embryos.
  • Early hematopoiesis in EBs occurs independently of added growth factors but is enhanced by Kit ligand and IL-11 at later stages (days 10-14).
  • Hematopoietic precursor development in EBs follows an ordered pattern: primitive erythroid, followed by macrophage/definitive erythroid, neutrophil/macrophage, and finally mast cell lineages.
  • The kinetics and growth factor responsiveness of EB hematopoiesis resemble those observed in the yolk sac and early fetal liver.

Conclusions:

  • In vitro differentiation of ESCs into embryoid bodies provides a robust model for studying early hematopoiesis.
  • The observed gene expression patterns and developmental kinetics suggest conserved mechanisms between in vitro and in vivo hematopoietic development.
  • This system allows for the investigation of hematopoietic stem cell development and potential therapeutic targets in a controlled environment.