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Decrease in VEGF expression induces intussusceptive vascular pruning.

Ruslan Hlushchuk1, Martin Ehrbar, Philipp Reichmuth

  • 1Institute of Anatomy, University of Fribourg, Fribourg, Switzerland.

Arteriosclerosis, Thrombosis, and Vascular Biology
|September 17, 2011
PubMed
Summary
This summary is machine-generated.

Decreased vascular endothelial growth factor (VEGF) triggers vascular tree regression through intussusceptive pruning. This discovery offers new therapeutic targets for anti-angiogenic strategies in diseases.

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Area of Science:

  • Vascular biology
  • Angiogenesis research
  • Developmental biology

Background:

  • Vascular pruning is crucial for vessel remodeling, especially with advancing angio-modulating therapies.
  • Vascular endothelial growth factor (VEGF) promotes angiogenesis, but mechanisms of structural changes upon its downregulation are unclear.

Purpose of the Study:

  • To investigate the structural mechanisms of vascular adaptation following VEGF withdrawal.
  • To elucidate the role of intussusception in VEGF-mediated vascular pruning.

Main Methods:

  • VEGF(165)-releasing hydrogels applied to chick chorioallantoic membrane on embryonic day 10.
  • Time-lapse in vivo microscopy and analysis of vascular casts/semithin sections to observe vascular changes.
  • Enzyme-linked immunosorbent assay (ELISA) to quantify VEGF-A levels.

Main Results:

  • Exogenous VEGF application induced significant angiogenesis within 24 hours.
  • Abrupt VEGF withdrawal after 48 hours led to vascular tree regression.
  • Intussusceptive vascular pruning, characterized by pillar formation at bifurcations, was observed and confirmed via in vivo microscopy.

Conclusions:

  • VEGF withdrawal actively drives vascular regression via intussusceptive pruning.
  • This mechanism may explain tumor vasculature normalization under anti-angiogenic therapy.
  • Identified targets for novel anti-angiogenic and angio-modulating therapies in pathological conditions.