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Transferrin promotes endothelial cell migration and invasion: implication in cartilage neovascularization
M F Carlevaro1, A Albini, D Ribatti
1Istituto Nazionale per la Ricerca sul Cancro, Università di Genova, Italy.
The Journal of Cell Biology
|March 24, 1997
Summary
Transferrin, a protein made by hypertrophic cartilage, significantly stimulates blood vessel growth (angiogenesis). This finding is crucial for understanding bone formation and wound healing processes.
Area of Science:
- Biochemistry
- Developmental Biology
- Orthopedics
Background:
- Endochondral bone formation involves cartilage transformation, erosion, and vascularization.
- Resting cartilage inhibits angiogenesis, while hypertrophic cartilage promotes it.
- Transferrin is a key protein synthesized by hypertrophic cartilage.
Purpose of the Study:
- To investigate the role of transferrin in angiogenesis during endochondral ossification.
- To determine if transferrin acts as an angiogenic stimulator released by hypertrophic cartilage.
Main Methods:
- In vitro assays measuring endothelial cell migration and invasion.
- Checkerboard analysis to assess chemotaxis and chemokinesis.
- In vivo neovascularization assays on the chicken chorioallantoic membrane.
- Use of anti-transferrin antibodies and transferrin receptor blocking antibodies.
Main Results:
- Transferrins from various sources, including hypertrophic cartilage, stimulate endothelial cell migration and invasion.
- Transferrin exhibits both chemotactic and chemokinetic properties.
- Anti-transferrin antibodies and transferrin receptor blockers significantly inhibit transferrin-induced endothelial cell responses.
- Transferrin production by chondrocytes correlates with angiogenic activity in conditioned media.
Conclusions:
- Transferrin is identified as a major angiogenic molecule produced by hypertrophic chondrocytes.
- Transferrin plays a significant role in promoting neovascularization during endochondral bone formation.