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In Vitro Differentiation of Human Pluripotent Stem Cells into Trophoblastic Cells
Published on: March 16, 2017
GATA-6 promotes cell survival by up-regulating BMP-2 expression during embryonic stem cell differentiation
1Department of Surgery, University of Medicine and Dentistry of New Jersey-Robert Wood Johnson Medical School, New Brunswick, NJ 08903, USA.
Molecular Biology of the Cell
|August 3, 2012
Summary
GATA-6 transcription factor loss causes embryonic cell death by reducing bone morphogenetic protein 2 (BMP-2) signaling. Restoring BMP-2 rescues this apoptosis, highlighting GATA-6
Area of Science:
- Developmental Biology
- Molecular Biology
- Stem Cell Biology
Background:
- GATA-6 is crucial for early embryogenesis, with its absence impairing endoderm differentiation and causing epiblast cell death.
- Previous studies linked GATA-6 loss to endoderm defects via HNF4, disabled-2, and GATA-4, but mechanisms of epiblast apoptosis remained unknown.
Purpose of the Study:
- To investigate the mechanisms underlying epiblast cell apoptosis caused by GATA-6 ablation during early embryonic development.
- To elucidate the role of GATA-6 in regulating cell survival pathways, specifically focusing on bone morphogenetic protein 2 (BMP-2) signaling.
Main Methods:
- Utilized mouse embryonic stem cell-derived embryoid bodies (EBs) as a model for peri-implantation development.
- Performed endoderm grafting, ectopic basement membrane assembly, chromatin immunoprecipitation, and BMP-2/noggin treatments.
- Analyzed SMAD1/5 phosphorylation levels in GATA-6 deficient and wild-type EBs.
Main Results:
- GATA-6 ablation in EBs led to massive apoptosis, associated with reduced bone morphogenetic protein 2 (BMP-2) expression.
- GATA-6 directly binds to the Bmp2 promoter, indicating transcriptional regulation.
- BMP-2 treatment rescued apoptosis in GATA-6 deficient EBs, while BMP antagonism induced apoptosis in normal EBs.
- SMAD1/5 phosphorylation was inhibited in GATA-6 deficient EBs but restored by BMP-2 addition.
Conclusions:
- GATA-6 promotes cell survival during embryonic epithelial morphogenesis by regulating endoderm expression of BMP-2.
- GATA-6-mediated BMP-2 signaling is critical for preventing apoptosis in developing embryonic tissues.
- The study identifies a novel role for GATA-6 in linking BMP signaling to cell survival during embryogenesis.
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