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Related Experiment Videos

JunB is required for endothelial cell morphogenesis by regulating core-binding factor beta.

Alexander H Licht1, Oliver T Pein, Lore Florin

  • 1Division of Signal Transduction and Growth Control, German Cancer Research Center, Deutsches Krebsforschungszentrum, D-69120 Heidelberg, Germany.

The Journal of Cell Biology
|December 13, 2006
PubMed
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JunB is crucial for endothelial cell tube formation. Its target, CBFbeta, restores this function in deficient cells, revealing a new mechanism for endothelial morphogenesis.

Area of Science:

  • Molecular Biology
  • Developmental Biology
  • Cell Biology

Background:

  • The organization of endothelial cells into multicellular tubules, a process vital for vascular development, remains mechanistically unclear.
  • Understanding the molecular underpinnings of endothelial morphogenesis is essential for regenerative medicine and treating vascular diseases.

Purpose of the Study:

  • To elucidate the molecular mechanisms governing endothelial cell (EC) organization into tubules.
  • To investigate the role of the AP-1 subunit JunB in endothelial morphogenesis.
  • To identify novel JunB target genes involved in EC tube formation.

Main Methods:

  • Endothelial-specific ablation of JunB in mouse embryos.
  • In vitro angiogenesis assays.
  • cDNA microarray analysis to identify JunB target genes.

Related Experiment Videos

  • Analysis of core-binding factor beta (CBFbeta) and MMP-13 expression.

    • Main Results:

    • Cell-autonomous endothelial functions of JunB are essential for proper endothelial morphogenesis in vivo and in vitro.
    • Core-binding factor beta (CBFbeta) was identified as a novel JunB target gene.
    • Expression of the CBF target MMP-13 was reduced in JunB-deficient ECs.
    • Reintroduction of CBFbeta rescued the tube formation defect and MMP-13 expression in JunB-deficient ECs.

    Conclusions:

    • JunB plays a critical role in endothelial cell morphogenesis through the regulation of CBFbeta.
    • CBFbeta is a key mediator of JunB's function in EC tube formation.
    • This study reveals a novel molecular pathway involving JunB and CBFbeta in endothelial tubulogenesis.