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Signalling, cell cycle and pluripotency in embryonic stem cells.
Tom Burdon1, Austin Smith, Pierre Savatier
1Department of Gene Expression and Development, Roslin Institute, Midlothian, EH25 9PS, Roslin, UK.
Trends in Cell Biology
|September 11, 2002
Summary
Leukaemia inhibitory factor (LIF) sustains pluripotent mouse embryonic stem cell self-renewal by activating STAT3. Other signals regulate differentiation and propagation, potentially involving cell-cycle roles in maintaining pluripotency.
Area of Science:
- Stem cell biology
- Molecular signaling pathways
- Cell cycle regulation
Background:
- Pluripotent mouse embryonic stem (ES) cells exhibit symmetrical self-renewal in vitro.
- Self-renewal involves proliferation while suppressing differentiation.
- Understanding the molecular mechanisms maintaining pluripotency is crucial.
Purpose of the Study:
- To elucidate the molecular mechanisms by which leukaemia inhibitory factor (LIF) sustains ES cell self-renewal.
- To investigate the roles of extracellular-signal-related kinase (ERK) and phosphatidylinositol-3-OH kinase (PI3K) in ES cell fate.
- To explore the connection between ES cell cycle properties and pluripotency maintenance.
Main Methods:
- Investigated the role of LIF in ES cell self-renewal.
- Analyzed the activation of STAT3 transcription factor by LIF.
- Examined the influence of ERK and PI3K signaling pathways.
Main Results:
- LIF sustains ES cell self-renewal through STAT3 activation.
- ERK signaling influences ES cell differentiation.
- PI3K signaling impacts ES cell propagation.
- ES cell cycle properties are linked to pluripotency.
Conclusions:
- LIF-STAT3 signaling is a key regulator of mouse ES cell self-renewal.
- ERK and PI3K pathways modulate differentiation and propagation, respectively.
- The cell cycle may play a significant role in maintaining pluripotency in ES cells.