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Investigating Angiogenesis on a Functional and Molecular Level by Leveraging the Scratch Wound Migration Assay and the Spheroid Sprouting Assay
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Physiological angiogenesis is a graded, not threshold, response.

Stuart Egginton1, Iman Badr, James Williams

  • 1Angiogenesis Research Group, Centre for Cardiovascular Sciences, University of Birmingham Medical School, Birmingham B15 2TT, UK. s.egginton@bham.ac.uk

The Journal of Physiology
|November 10, 2010
PubMed
Summary
This summary is machine-generated.

This study investigated skeletal muscle angiogenesis, finding that mechanical overload, not metabolic factors, drives new blood vessel growth. The intensity of the mechanical stimulus directly correlates with the degree of angiogenesis in overloaded muscles.

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Area of Science:

  • Physiology
  • Cell Biology
  • Biochemistry

Background:

  • Skeletal muscle angiogenesis can be triggered by metabolic or mechanical stimuli.
  • The existence of a threshold for in vivo physiological angiogenesis remains unclear.

Purpose of the Study:

  • To investigate the role of mechanical overload intensity in inducing skeletal muscle angiogenesis.
  • To determine if a stimulus threshold exists for physiological angiogenesis in skeletal muscle.

Main Methods:

  • Three rat extensor digitorum longus (EDL) muscle overload models were used, varying in mechanical stretch intensity.
  • Capillary supply, cell proliferation (PCNA), myonuclei, and protein expression (SERCA, CPT, VEGF, Flk-1) were quantified over 28 days.

Main Results:

  • Overload-induced angiogenesis showed a graded response, correlating with stimulus intensity.
  • Higher mechanical overload (extirpation) led to earlier and more significant increases in proliferation markers (PCNAcap) and capillary supply.
  • While pro-angiogenic factors VEGF and Flk-1 increased similarly across models, the cellular response varied with overload severity.

Conclusions:

  • Skeletal muscle angiogenesis following overload is primarily a mechanical response.
  • The extent of angiogenesis is graded according to the intensity of the mechanical stimulus.