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FGF9 can induce endochondral ossification in cranial mesenchyme
Venkatesh Govindarajan1, Paul A Overbeek
1Cancer Center, Creighton University, Omaha, NE 68178, USA. g.v@creighton.edu
BMC Developmental Biology
|March 1, 2006
Summary
Fibroblast growth factor 9 (FGF9) can alter skull bone development. FGF9 expression in mice switches cranial bone formation from intramembranous to endochondral ossification, demonstrating its role in cell differentiation.
Area of Science:
- Developmental Biology
- Skeletal Biology
- Molecular Biology
Background:
- Skull flat bones typically form via intramembranous ossification.
- This process involves direct osteoblast differentiation from mesenchymal cells.
- It differs from endochondral ossification, which uses a cartilage intermediate.
Purpose of the Study:
- To investigate the effect of fibroblast growth factor 9 (FGF9) on cranial bone development.
- To determine if FGF9 can alter the ossification pathway in cranial mesenchymal cells.
Main Methods:
- Analysis of transgenic mice expressing FGF9 in cranial mesenchymal cells.
- Gene expression analysis (Sox9, Ihh, Col2a1, Col10a1, CbfaI, Osteocalcin).
- Fate mapping studies to trace cell lineage.
Main Results:
- Transgenic mice exhibited a switch from intramembranous to endochondral ossification in parietal bones.
- FGF9 induced proliferation and hypertrophy of cranial cartilage precursors.
- Observed changes in gene expression associated with cartilage and bone formation.
Conclusions:
- FGF9 expression is sufficient to convert cranial mesenchymal cell differentiation.
- The switch is from intramembranous to endochondral ossification.
- This highlights FGF9's role in regulating skeletal ossification pathways.