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SRF regulates Bcl-2 expression and promotes cell survival during murine embryonic development
Gerhard Schratt1, Ulrike Philippar, Dirk Hockemeyer
1Interfakultäres Institut für Zellbiologie, Abteilung Molekularbiologie, Universität Tübingen, Auf der Morgenstelle, Tübingen, Germany.
The EMBO Journal
|April 2, 2004
Summary
Serum response factor (SRF) regulates antiapoptotic genes like Bcl-2, crucial for cell survival. SRF deficiency in mouse embryos increases apoptosis, highlighting its role in early development.
Area of Science:
- Molecular Biology
- Developmental Biology
- Cell Biology
Background:
- The transcription factor serum response factor (SRF) regulates genes essential for cell proliferation, differentiation, and survival.
- SRF plays a role in cell survival by controlling the expression of antiapoptotic genes.
Purpose of the Study:
- To investigate the role of SRF in regulating antiapoptotic gene expression and its impact on cell survival during early murine embryogenesis.
- To determine if SRF-mediated Bcl-2 expression is critical for embryonic stem cell survival.
Main Methods:
- Utilized in vitro differentiating murine embryonic stem (ES) cells and embryoid bodies (EBs).
- Assessed SRF deficiency effects on apoptosis and antiapoptotic gene expression (Bcl-2, Bcl-xl).
- Performed in vivo promoter binding assays and gene reconstitution experiments.
Main Results:
- SRF deficiency in ES cells led to increased apoptosis and impaired expression of Bcl-2 and Bcl-xl.
- SRF directly binds to the Bcl-2 promoter and activates its transcription.
- Restoring Bcl-2 expression rescued Srf-/- ES cells from apoptosis.
- SRF deficiency caused impaired EB cavitation and increased apoptosis in EBs and early mouse embryos.
Conclusions:
- SRF-regulated Bcl-2 expression is a novel mechanism critical for cell survival during early murine embryogenesis.
- SRF plays a vital role in maintaining embryonic development by preventing inappropriate apoptosis.