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Assessing Therapeutic Angiogenesis in a Murine Model of Hindlimb Ischemia
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Pro-Calcific Environment Impairs Ischaemia-Driven Angiogenesis.

Jocelyne Mulangala1,2, Emma J Akers1,2, Emma L Solly1,2

  • 1Discipline of Medicine, University of Adelaide, Adelaide, SA 5005, Australia.

International Journal of Molecular Sciences
|March 25, 2022
PubMed
Summary
This summary is machine-generated.

Arterial calcification impairs blood vessel formation (angiogenesis) in peripheral arterial disease (PAD). This study shows calcification hinders the body's ability to heal ischemic limbs, impacting blood flow and limb function.

Keywords:
angiogenesisischaemiaperipheral arterial diseasevascular calcification

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Area of Science:

  • Vascular Biology
  • Cardiovascular Research
  • Biomedical Science

Background:

  • Peripheral arterial disease (PAD) involves accelerated arterial calcification and impaired angiogenesis.
  • The precise mechanisms linking vascular calcification to PAD progression remain unclear.
  • Understanding calcification's impact on angiogenesis is crucial for developing effective PAD therapies.

Purpose of the Study:

  • To investigate the effect of a pro-calcific environment on ischemia-driven angiogenesis.
  • To elucidate the molecular mechanisms underlying calcification-induced impairment of vascular repair.

Main Methods:

  • Human coronary artery endothelial cells (ECs) were cultured in calcification medium (CM) under normoxia and hypoxia.
  • In vitro assays assessed tubule formation, migration, and gene/protein expression (ALP, BMP2, Runx2, OPG, VEGFA, HIF-1α, eNOS).
  • Osteoprotegerin-deficient (OPG-/-) mice underwent hind-limb ischemia (HLI) surgery to model PAD and calcification.

Main Results:

  • CM inhibited EC tubule formation and migration, upregulating calcification markers (ALP, BMP2, Runx2) and OPG in normoxia.
  • CM suppressed pro-angiogenic factors (VEGFA, HIF-1α) and eNOS phosphorylation in hypoxia.
  • OPG-/- mice showed impaired blood flow reperfusion, reduced limb function, and increased serum ALP after HLI.

Conclusions:

  • A pro-calcific environment detrimentally affects ischemia-driven angiogenesis.
  • Calcification significantly impairs vascular repair mechanisms essential for limb salvage in PAD.
  • These findings highlight calcification as a critical therapeutic target for improving PAD treatment outcomes.