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BMP4 promotes EMT and mesodermal commitment in human embryonic stem cells via SLUG and MSX2
Anne Richter1, Lena Valdimarsdottir, Helga Eyja Hrafnkelsdottir
1Department of Biochemistry and Molecular Biology, BioMedical Center, University of Iceland, Iceland.
Stem Cells (Dayton, Ohio)
|February 20, 2014
Summary
Bone morphogenetic proteins (BMPs) trigger human embryonic stem cell (hESC) differentiation via SLUG and MSX2 transcription factors. These factors mediate mesodermal and cardiovascular lineage development, revealing key mechanisms in stem cell biology.
Area of Science:
- Stem cell biology
- Developmental biology
- Molecular signaling
Background:
- Bone morphogenetic proteins (BMPs) are known to initiate differentiation in human embryonic stem cells (hESCs).
- The precise molecular mechanisms underlying BMP-induced hESC differentiation remain incompletely understood.
- Epithelial-mesenchymal transitions (EMTs), crucial for development and disease, involve key transcription factors.
Purpose of the Study:
- To elucidate the role of transcription factors SLUG and MSX2 in BMP4-induced differentiation of hESCs.
- To investigate the molecular mediators of BMP signaling pathways in hESC differentiation.
- To determine the downstream effects of SLUG and MSX2 on cell behavior and lineage commitment.
Main Methods:
- Investigated the expression and localization of SLUG and MSX2 in BMP4-treated hESCs.
- Utilized phosphorylated Smad1/5/8 (pSmad1/5/8) colocalization studies.
- Performed promoter binding assays for pSmad1/5/8 on the SLUG gene.
- Employed short hairpin RNA (shRNA) to knock down SLUG expression.
- Analyzed cell migration and differentiation markers, including mesodermal and cardiovascular lineage markers.
Main Results:
- BMP4 treatment upregulated SLUG and MSX2 in hESCs, with pSmad1/5/8 colocalizing with SLUG at differentiating edges.
- Direct binding of pSmad1/5/8 to the SLUG promoter was confirmed, leading to decreased cell adhesion and increased migration.
- SLUG knockdown abrogated BMP4-induced changes, confirming its essential role in mesodermal differentiation.
- BMP4-induced MSX2 expression promoted mesoderm formation and subsequent cardiovascular lineage differentiation.
Conclusions:
- SLUG and MSX2 are critical mediators of BMP4-induced differentiation in hESCs.
- BMP signaling regulates hESC differentiation through SLUG by modulating cell adhesion and migration.
- MSX2 plays a key role in directing BMP4-induced mesodermal differentiation towards the cardiovascular lineage.
