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FGFR2 accommodates osteogenic cell fate determination in human mesenchymal stem cells
Ying Zhang1, Ling Ling2, Arya Ajay D/O Ajayakumar1
1Institute of Molecular and Cell Biology, Agency for Science, Technology and Research (A*STAR), 138673, Singapore.
Gene
|January 30, 2022
Summary
Fibroblast growth factor receptor 2 (FGFR2) is crucial for human mesenchymal stem cell (hMSC) osteogenic differentiation. Reduced FGFR2 impairs bone formation and promotes fat cell development, impacting hMSC multipotency.
Area of Science:
- Stem cell biology
- Regenerative medicine
- Molecular biology
Background:
- Human mesenchymal stem cells (hMSCs) possess multilineage differentiation potential vital for tissue regeneration.
- Growth factors and their receptors, like fibroblast growth factors (FGFs) and FGF receptors (FGFRs), regulate hMSC fate decisions.
- The precise role of FGFRs in orchestrating osteogenic progression requires further elucidation.
Purpose of the Study:
- To investigate the role of FGFRs in osteogenic differentiation of hMSCs.
- To determine the correlation between FGFR expression levels and osteogenic markers.
- To elucidate the molecular mechanisms by which FGFRs influence hMSC lineage commitment.
Main Methods:
- Studied FGFR protein levels during osteogenesis in human adult bone marrow-derived MSCs.
- Utilized RNA interference (RNAi) to knock down FGFR2 expression.
- Analyzed gene expression profiles for osteogenic and adipogenic markers.
- Assessed the expression of Enhancer of Zeste Homolog 2 (EZH2) following FGFR2 knockdown.
- Evaluated osteogenic potential in serially passaged hMSCs.
Main Results:
- A positive correlation was observed between FGFR2 expression and alkaline phosphatase (ALP) activity, an early osteogenic marker.
- FGFR2 knockdown significantly downregulated pro-osteogenic genes and upregulated pro-adipogenic genes, indicating a shift towards adipogenic commitment.
- FGFR2 knockdown led to increased EZH2 expression under osteogenic induction conditions.
- Serial passaging of hMSCs resulted in reduced FGFR2 expression and diminished osteogenic potential.
Conclusions:
- FGFR2 plays a critical role in mediating osteogenic fate in hMSCs.
- FGFR2 regulates the balance between osteogenic and adipogenic lineage commitment.
- Reduced FGFR2 expression in passaged hMSCs contributes to impaired osteogenic capacity.
- Monitoring FGFR2 levels may serve as a useful indicator of hMSC multipotency during serial passaging.
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