Neurotrophin p75 receptor (p75NTR) promotes endothelial cell apoptosis and inhibits angiogenesis: Implications for diabetes-induced impaired neovascularization in ischemic limb muscles

Andrea Caporali, Elisabetta Pani, Anton J G Horrevoets, Nicolle Kraenkel, Atsuhiko Oikawa, Graciela B. Sala-Newby, Marco Meloni, Brunella Cristofaro, Gallia Graiani, Aurelie S. Leroyer, Chantal M. Boulanger, Gaia Spinetti, Sung Ok Yoon, Paolo Madeddu, Costanza Emanueli

Research output: Contribution to journalArticlepeer-review

Abstract

Diabetes impairs endothelial function and reparative neovascularization. The p75 receptor of neurotrophins (p75), which is scarcely present in healthy endothelial cells (ECs), becomes strongly expressed by capillary ECs after induction of peripheral ischemia in type-1 diabetic mice. Here, we show that gene transfer-induced p75 expression impairs the survival, proliferation, migration, and adhesion capacities of cultured ECs and endothelial progenitor cells (EPCs) and inhibits angiogenesis in vitro. Moreover, intramuscular p75 gene delivery impairs neovascularization and blood flow recovery in a mouse model of limb ischemia. These disturbed functions are associated with suppression of signaling mechanisms implicated in EC survival and angiogenesis. In fact, p75 depresses the VEGF-A/Akt/eNOS/NO pathway and additionally reduces the mRNA levels of ITGB1 [beta (1) integrin], BIRC5 (survivin), PTTG1 (securin) and VEZF1. Diabetic mice, which typically show impaired postischemic muscular neovascularization and blood perfusion recovery, have these defects corrected by intramuscular gene transfer of a dominant negative mutant form of p75. Collectively, our data newly demonstrate the antiangiogenic action of p75 and open new avenues for the therapeutic use of p75 inhibition to combat diabetes-induced microvascular liabilities.

Original languageEnglish
JournalCirculation Research
Volume103
Issue number2
DOIs
Publication statusPublished - Jul 18 2008

Keywords

  • Limb ischemia
  • Neurotrophins
  • P75NTR
  • Reparative neovascularization
  • VEGF-A

ASJC Scopus subject areas

  • Physiology
  • Cardiology and Cardiovascular Medicine

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