Early determination of the dorsal-ventral axis in endochondral ossification in mice
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View abstract on PubMed
Summary
This summary is machine-generated.Skeletal progenitor cells, identified by Fgfr3, are crucial for dorsal-ventral axis formation during fetal bone development. Ablating these cells severely disrupts long bone growth, highlighting the condensation stage
Area Of Science
- Developmental Biology
- Skeletal Biology
- Cellular Dynamics
Background
- Endochondral ossification is a complex process involving multiple progenitor cell types.
- Previous lineage tracing studies have identified various fates of early skeletal cells.
- Precise cellular dynamics along the dorsoventral axis during fetal skeletal development remain poorly understood.
Purpose Of The Study
- To elucidate the continuous and precise cellular dynamics of fetal skeletal cells, particularly along the dorsoventral axis.
- To determine the contribution of spatiotemporally specific skeletal progenitor cells to skeletal formation.
- To investigate the role of Fgfr3+ cells in mesenchymal condensation during skeletal development.
Main Methods
- Spatiotemporally specific lineage tracing using Fgfr3-creER and Dlx5-creER transgenic mouse lines.
- Functional ablation of Fgfr3+ cells using the Rosa26iDTA (inducible diphtheria toxin fragment A) allele.
- Analysis of long bone development and cellular contributions to skeletal structures.
Main Results
- Fgfr3+ cells in mesenchymal condensation exclusively contribute to hypertrophic chondrocytes and specific zones of the cartilage anlage.
- These Fgfr3+ cells exhibit dorsal-restricted contributions to growth plate chondrocytes, osteoblasts, and bone marrow stromal cells.
- Ablation of Fgfr3+ cells during mesenchymal condensation severely impairs long bone development.
Conclusions
- The mesenchymal condensation stage is critical for establishing skeletal progenitors and dorsoventral patterning.
- Fgfr3+ cells play an indispensable role in initiating skeletal growth and patterning.
- Findings offer insights into skeletal growth disorders and potential therapeutic strategies for bone regeneration.
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