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Related Experiment Videos

Cytokine signalling in embryonic stem cells.

David Møbjerg Kristensen1, Mark Kalisz, Jens Høiriis Nielsen

  • 1Department of Medical Biochemistry and Genetics, Panum Institute, University of Copenhagen, Copenhagen, Denmark.

APMIS : Acta Pathologica, Microbiologica, Et Immunologica Scandinavica
|February 17, 2006
PubMed
Summary

Leukemia inhibitory factor (LIF) and Wnt pathways both promote embryonic stem cell self-renewal, primarily through c-myc. While LIF is key in mice, Wnt is crucial for both human and mouse stem cells.

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Area of Science:

  • Stem cell biology
  • Molecular signaling pathways
  • Developmental biology

Background:

  • Cytokines, particularly leukemia inhibitory factor (LIF), are vital for maintaining self-renewal in mouse embryonic stem (ES) cells.
  • LIF signaling involves the JAK-STAT3 pathway via the gp130 receptor complex, crucial for c-myc induction and preventing differentiation.
  • The canonical Wnt pathway also sustains self-renewal in both human and mouse ES cells.

Purpose of the Study:

  • To investigate the roles of LIF-JAK-STAT3 and Wnt pathways in embryonic stem cell self-renewal.
  • To elucidate the convergence of these signaling pathways on common targets like c-myc.
  • To understand the differential roles and potential redundancy of cytokine signaling in stem cell maintenance.

Main Methods:

Related Experiment Videos

  • Analysis of cytokine signaling pathways, including LIF-JAK-STAT3 and Wnt.
  • Investigating the activation of signaling molecules like STAT3, PI3K, and Src.
  • Examining the expression of key genes such as c-myc in response to pathway activation.

    • Main Results:

    • Both LIF-JAK-STAT3 and Wnt pathways converge on c-myc to promote ES cell self-renewal.
    • LIF-JAK-STAT3 signaling is critical for mouse ES cell self-renewal, potentially adapted for embryonic diapause.
    • Wnt pathway is sufficient for self-renewal in both human and mouse ES cells; LIF is less effective in human ES cells.

    Conclusions:

    • The Wnt pathway is likely the primary driver of self-renewal in ES cells, with LIF-JAK-STAT3 serving a specialized role in mice.
    • c-myc acts as a common downstream target for both pathways in maintaining stem cell pluripotency.
    • Stem cell maintenance involves complex, potentially redundant signaling networks with quantitative variations in pathway activation.