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Regulation of Angiogenesis and Blood Supply

Rapidly dividing tumors, embryos, and wounded tissues require more oxygen than usual, lowering the oxygen concentration in the blood. At low oxygen or hypoxic conditions, an oxygen-sensitive transcription factor called the hypoxia-inducible factor 1 or HIF1 is activated. HIF1 is a dimeric protein of alpha (ɑ) and beta (β) subunits.  Under optimal oxygen conditions, HIF1β is present in the nucleus while HIF1ɑ remains in the cytosol. HIF1ɑ is hydroxylated by prolyl hydroxylase and factor...
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A Simple Bioassay for the Evaluation of Vascular Endothelial Growth Factors
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Published on: March 15, 2016

Complicated life, complicated VEGF-B.

Xuri Li1, Anil Kumar, Fan Zhang

  • 1National Eye Institute, National Institutes of Health, Rockville, MD 20852, USA. lixur@nei.nih.gov

Trends in Molecular Medicine
|December 20, 2011
PubMed
Summary

Vascular Endothelial Growth Factor-B (VEGF-B) is not a typical growth factor, as its absence shows normal growth in mice. This review explores VEGF-B's complex roles and therapeutic potential.

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • Vascular Endothelial Growth Factor-B (VEGF-B) is a poorly understood member of the VEGF family.
  • Despite its name, VEGF-B does not appear to be a primary growth factor, as evidenced by normal growth in VEGF-B deficient mice.
  • Its role in angiogenesis is contradictory, with some studies showing pro-angiogenic effects and others demonstrating anti-angiogenic or anti-tumorigenic properties.

Purpose of the Study:

  • To review recent advancements in understanding VEGF-B biology.
  • To discuss the multifaceted roles of VEGF-B.
  • To explore the underlying mechanisms and potential therapeutic implications of VEGF-B.

Main Methods:

  • Literature review of recent research on VEGF-B.
  • Analysis of studies investigating VEGF-B's function in various biological contexts.
  • Synthesis of findings to elucidate VEGF-B's mechanisms of action.

Main Results:

  • VEGF-B's function is complex and context-dependent, deviating from typical growth factor or angiogenic factor roles.
  • VEGF-B can exhibit both pro-angiogenic and anti-angiogenic activities under different conditions.
  • Evidence suggests VEGF-B may inhibit tumor growth and angiogenesis in certain scenarios.

Conclusions:

  • The biological function of VEGF-B remains enigmatic due to its contradictory roles.
  • Further research is needed to fully elucidate the mechanisms governing VEGF-B's diverse functions.
  • Understanding VEGF-B's multifaceted roles may unlock novel therapeutic strategies.