VEGF-A splice variants and related receptor expression in human skeletal muscle following submaximal exercise

J Appl Physiol (1985). 2005 Jun;98(6):2137-46. doi: 10.1152/japplphysiol.01402.2004. Epub 2005 Jan 20.

Abstract

VEGF-A contributes to muscle tissue angiogenesis following aerobic exercise training. The temporal response of the VEGF-A isoforms and their target receptors has not been comprehensively profiled in human skeletal muscle. We combined submaximal exercise with and without reduced leg blood flow to establish whether ischemia-induced metabolic stress was an important physiological stimuli responsible for regulating the VEGF-A system in humans. Nine healthy men performed two 45-min bouts of one-leg knee-extension exercise, with and without blood flow restriction. Muscle biopsies were obtained at rest and 2 and 6 h after exercise. Expression (mRNA) of the VEGF-A splice variants and related receptors [VEGF receptor (VEGFR)-1, VEGFR-2, and neuropilin-1] was determined by using qPCR. VEGF-A(total) expression increased more robustly after exercise with reduced blood flow, and initially this principally reflected an increase in VEGF-A(165). Six hours after exercise, there was a relatively greater increase in VEGF-A(189), and this response was not influenced by blood flow conditions. VEGFR-1 mRNA expression increased 2 h after exercise, and neuropilin-1 expression was transiently reduced, while all three receptors increased by 6 h. There was no evidence for the expression of the inhibitory VEGF-A(165B) variant in human skeletal muscle. Our study, reflecting both VEGF-A ligand and receptors, implicates metabolic perturbation as a regulator of human muscle angiogenesis and demonstrates that VEGF-A splice variants are distinctly regulated. Our findings also indicate that all three receptor genes exhibit different pretranslational regulation, in response to exercise in humans.

Publication types

  • Clinical Trial
  • Randomized Controlled Trial
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adaptation, Physiological / genetics
  • Adolescent
  • Adult
  • Blood Flow Velocity / genetics
  • DNA, Recombinant / genetics
  • Exercise Test
  • Gene Expression Regulation / genetics
  • Genetic Variation / genetics
  • Humans
  • Male
  • Muscle Contraction / genetics
  • Muscle, Skeletal / blood supply
  • Muscle, Skeletal / metabolism*
  • Physical Exertion*
  • Receptors, Vascular Endothelial Growth Factor / genetics*
  • Receptors, Vascular Endothelial Growth Factor / metabolism*
  • Reperfusion Injury / physiopathology*
  • Vascular Endothelial Growth Factor A / genetics*
  • Vascular Endothelial Growth Factor A / metabolism*

Substances

  • DNA, Recombinant
  • Vascular Endothelial Growth Factor A
  • Receptors, Vascular Endothelial Growth Factor