Reactive oxygen species stimulate VEGF production from C2C12 skeletal myotubes through a PI3K/Akt pathway

Ioanna Kosmidou, Angeliki Xagorari, Charis Roussos, Andreas Papapetropoulos

Research output: Contribution to journalArticle

60 Scopus citations

Abstract

Vascular endothelial growth factor (VEGF) is a potent angiogenic stimulus, the expression of which increases in skeletal muscle after exercise. Because exercise is also accompanied by increased intramuscular reactive oxygen species (ROS) generation, we tested the hypothesis that ROS stimulate VEGF production from skeletal myotubes. Differentiated C2C12 skeletal myotubes exposed to ROS-producing agents exhibited a concentration-dependent increase in VEGF production, whereas undifferentiated myoblasts did not respond to oxidants. Moreover, conditioned medium from ROS-treated myotubes increased the bovine lung microvascular cell proliferation rate. To study the mechanism(s) involved in the stimulation of VEGF production by ROS, myotubes were pretreated with a selective phosphatidylinositol 3-kinase (PI3K) inhibitor, LY-294002, before being exposed to hydrogen peroxide or pyrogallol. LY-294002 attenuated both Akt phosphorylation and VEGF production. In addition, oxidants increased nuclear factor-κB-dependent promoter activity in transiently transfected myotubes; however, pretreatment with the pharmacological inhibitor of nuclear factor-κB, diethyldithiocarbamate, did not affect the oxidant-stimulated VEGF release. We conclude that ROS induce VEGF release from myotubes via a PI3K/Akt-dependent pathway.

Original languageEnglish (US)
Pages (from-to)L585-L592
JournalAmerican Journal of Physiology
Volume280
Issue number4 PART 1
DOIs
StatePublished - Apr 2001
Externally publishedYes

Keywords

  • Exercise
  • Phosphatidylinositol 3-kinase
  • Protein kinase B
  • Vascular endothelial growth factor

ASJC Scopus subject areas

  • Physiology (medical)

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