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Related Experiment Videos

VEGFA is necessary for chondrocyte survival during bone development.

Elazar Zelzer1, Roni Mamluk, Napoleone Ferrara

  • 1Department of Cell Biology, Harvard Medical School, Boston, MA 02115, USA.

Development (Cambridge, England)
|April 10, 2004
PubMed
Summary

Vascular endothelial growth factor (VEGFA) is vital for cartilage vascularization and chondrocyte survival during bone development. Conditional knockout of Vegfa in mice revealed delayed blood vessel invasion and significant chondrocyte death, highlighting VEGFA

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Area of Science:

  • Developmental Biology
  • Skeletal Biology
  • Molecular Biology

Background:

  • Vascular endothelial growth factor (VEGFA) is a key signaling molecule involved in angiogenesis and cell survival.
  • Its precise role in chondrogenesis and endochondral ossification requires further in vivo investigation.
  • Understanding VEGFA's function is critical for addressing skeletal development disorders.

Purpose of the Study:

  • To elucidate the specific functions of VEGFA in chondrocytes during cartilage development and endochondral ossification.
  • To investigate the impact of conditional Vegfa knockout in chondrocytes on bone formation processes.
  • To explore the relationship between VEGFA, chondrocyte survival, and vascularization in developing bone.

Main Methods:

  • Conditional knockout of the Vegfa gene in chondrocytes using a Col2a1-driven Cre-lox system in mice.

Related Experiment Videos

  • Analysis of skeletal development, vascularization, and chondrocyte viability in Vegfa conditional knockout (CKO) mice.
  • Comparison of cell death phenotypes with those observed in hypoxia-inducible factor 1 alpha (Hif1a) deficient mice.

    • Main Results:

    • Vegfa CKO mice exhibited delayed blood vessel invasion into primary ossification centers and impaired removal of hypertrophic chondrocytes.
    • Significant chondrocyte apoptosis was observed in the joint and epiphyseal regions of Vegfa CKO endochondral bones.
    • Chondrocytes in Vegfa CKO mice showed massive cell death, while wild-type chondrocytes upregulated Vegfa expression.
    • The cell death phenotype in Vegfa CKO mice closely resembled that of Hif1a-deficient mice, suggesting a shared pathway.

    Conclusions:

    • VEGFA is essential for both cartilage vascularization and chondrocyte survival during embryonic bone development.
    • Conditional deletion of Vegfa in chondrocytes leads to severe skeletal defects due to impaired vascularization and increased cell death.
    • HIF1 alpha and VEGFA function in a critical pathway to maintain chondrocyte survival during skeletal development.