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Related Concept Videos

Regulation of Angiogenesis and Blood Supply01:24

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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...
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Systemic VEGF-A neutralization ameliorates diet-induced metabolic dysfunction.

Lindsay E Wu1, Christopher C Meoli2, Salvatore P Mangiafico3

  • 1Diabetes and Obesity Program, Garvan Institute of Medical Research, Darlinghurst, New South Wales, AustraliaLaboratory for Ageing Research, School of Medical Sciences, UNSW Australia, New South Wales, Australia.

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Summary
This summary is machine-generated.

Neutralizing vascular endothelial growth factor (VEGF) rapidly reversed obesity-induced insulin resistance in mice. This suggests VEGF plays a key role in metabolic dysfunction, offering a new therapeutic target for obesity.

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Area of Science:

  • Endocrinology
  • Metabolic disease research
  • Angiogenesis and metabolic regulation

Background:

  • Vascular endothelial growth factor (VEGF) is crucial for angiogenesis and implicated in obesity.
  • Conflicting evidence exists regarding VEGF's role in obesity-related metabolic dysfunction.
  • Understanding VEGF's precise impact is vital for developing effective obesity treatments.

Purpose of the Study:

  • To investigate the effect of VEGF-A neutralization on glucose metabolism and insulin action in a diet-induced obesity mouse model.
  • To determine if blocking VEGF-A can ameliorate insulin resistance associated with obesity.

Main Methods:

  • Utilized a mouse model of diet-induced obesity.
  • Administered a VEGF-A-neutralizing monoclonal antibody (B.20-4.1).
  • Assessed parameters of glucose metabolism and insulin sensitivity within 72 hours.

Main Results:

  • Rapid reversal of high-fat diet-induced insulin resistance observed within 72 hours.
  • Improved insulin sensitivity in liver and adipose tissue was the primary driver of this reversal.
  • These metabolic improvements occurred independently of changes in overall body fat or insulin signaling pathways.

Conclusions:

  • VEGF-A neutralization rapidly improves insulin sensitivity and reverses obesity-induced insulin resistance.
  • VEGF plays a significant, previously unrecognized role in hepatic insulin resistance.
  • Targeting VEGF presents a novel therapeutic strategy for metabolic diseases associated with obesity.