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Related Experiment Videos

pVHL function is essential for endothelial extracellular matrix deposition.

Nan Tang1, Fiona Mack, Volker H Haase

  • 1Molecular Biology Section, MC-0377, Division of Biological Sciences, University of California--San Diego, La Jolla, California 92093-0377, USA.

Molecular and Cellular Biology
|March 16, 2006
PubMed
Summary

The von Hippel-Lindau protein (pVHL) is crucial for embryonic blood vessel development, independent of its oxygen-sensing role. It regulates fibronectin assembly, essential for vascular integrity and patterning.

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Area of Science:

  • Developmental Biology
  • Molecular Biology
  • Cell Biology

Background:

  • The von Hippel-Lindau protein (pVHL) is a key regulator of cellular oxygen sensing, targeting hypoxia-inducible factors for degradation under normoxia.
  • The VHL gene's role in vascular development and extracellular matrix assembly has not been fully elucidated, particularly independent of its hypoxia-related functions.

Purpose of the Study:

  • To investigate the role of the VHL gene in embryonic endothelial development and vascular extracellular matrix assembly.
  • To determine if pVHL's function in vascular development is independent of its known role in the hypoxic response.

Main Methods:

  • Generation of conditional VHL-null mice lacking the VHL gene specifically in endothelial cells.
  • Analysis of embryonic vascular development, including vasculogenesis, endocardium integrity, and vessel network patterning.

Related Experiment Videos

  • In vivo and in vitro assessment of vascular fibronectin deposition and endothelial cell assembly of fibronectin.

    • Main Results:

    • Endothelial-specific VHL-null mice exhibited embryonic lethality with severe vascular developmental defects, mirroring homozygous VHL-null mice.
    • Observed defects included impaired placental vasculogenesis, endocardial collapse, and abnormal vessel patterning, correlated with reduced fibronectin deposition.
    • VHL-null endothelial cells showed impaired migration and adhesion, partially rescued by exogenous fibronectin, highlighting pVHL's role in fibronectin regulation.

    Conclusions:

    • The VHL gene plays a critical, oxygen-sensing-independent role in embryonic endothelial development.
    • pVHL is essential for regulating vascular extracellular matrix assembly, specifically fibronectin deposition and organization.
    • pVHL's regulation of fibronectin is vital for proper vascular patterning and maintaining vascular integrity during embryonic development.