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Analysis of Retinoic Acid-induced Neural Differentiation of Mouse Embryonic Stem Cells in Two and Three-dimensional Embryoid Bodies
Published on: April 22, 2017
Context-dependent neuronal differentiation and germ layer induction of Smad4-/- and Cripto-/- embryonic stem cells
Kai-Christian Sonntag1, Rabi Simantov, Lars Björklund
1Udall Parkinson's Disease Research Center of Excellence, McLean Hospital/Harvard Medical School, Belmont, MA 02478, USA.
Molecular and Cellular Neurosciences
|March 2, 2005
Summary
Deleting Smad4 or Cripto in mouse embryonic stem cells promotes neural fates in vitro. However, these cells can still form non-neuronal tissues, indicating these deletions are insufficient to fully block mesodermal differentiation.
Area of Science:
- Developmental Biology
- Stem Cell Biology
- Molecular Biology
Background:
- Transforming growth factor-beta (TGF-beta) signaling is crucial for mesodermal development.
- Inhibition of TGF-beta signaling pathways is known to induce neural cell fates.
- Understanding the role of specific factors in TGF-beta signaling is key to controlling stem cell differentiation.
Purpose of the Study:
- To investigate the role of Smad4 and Cripto in TGF-beta pathway-mediated stem cell differentiation.
- To determine if deleting Smad4 or Cripto in embryonic stem cells can exclusively promote neural fates.
- To assess the potential of Smad4-/- and Cripto-/- embryonic stem cells for generating specific neuronal subtypes.
Main Methods:
- In vitro differentiation of mouse embryonic stem cells (ES cells) with Smad4 or Cripto gene deletions.
- Analysis of cell types generated, including neuronal and mesodermal lineages.
- In vivo transplantation of differentiated ES cells into mouse striatum.
- Gene expression analysis for midbrain and hindbrain markers.
Main Results:
- Smad4-/- and Cripto-/- ES cells showed an increased propensity for neural differentiation in vitro.
- Cripto-/- ES cells differentiated into neuroectodermal and epidermal lineages.
- Smad4-/- ES cells exhibited both mesodermal and neural differentiation.
- In vivo, transplanted ES cells formed neuronal grafts or larger grafts containing multiple germ layer derivatives, irrespective of genotype.
- Differentiated ES cells retained the capacity to form dopaminergic and serotonergic neurons.
Conclusions:
- Deletion of Smad4 or Cripto favors neural fates in vitro but does not completely abolish mesodermal differentiation.
- These genetic modifications are insufficient to exclusively block non-neuronal tissue formation from embryonic stem cells.
- The in vivo behavior of these modified ES cells suggests a complex interplay of factors influencing germ layer specification post-transplantation.
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