title: Essential role of copper-zinc superoxide dismutase for ischemia-induced neovascularization via modulation of bone marrow-derived endothelial progenitor cells.
abstract: OBJECTIVE
  To investigate the effect of oxidative stress on ischemia-induced neovascularization in copper-zinc (CuZn) superoxide dismutase (SOD)-deficient mice.
  
  
  RESULTS
  In the vascular wall, CuZnSOD is essential for protecting against excessive oxidative stress and maintaining endothelial function. However, its specific role for the development of new vessels in response to ischemia is unknown. After surgically induced hind limb ischemia, CuZnSOD-deficient mice showed impaired neovascularization, as assessed by blood flow recuperation (laser Doppler) and capillary density in the ischemic muscles. This was associated with increased levels of oxidative stress in ischemic tissues and peripheral blood, together with reduced plasmatic NO production. CuZnSOD-deficient mice demonstrated an important reduction in the number of endothelial progenitor cells (EPCs) in the bone marrow and spleen. Moreover, EPCs isolated from CuZnSOD-deficient mice showed increased oxidative stress levels, decreased NO production, and a reduced ability to migrate and integrate into capillary-like networks. Importantly, the functional activities of CuZnSOD-deficient EPCs were rescued after treatment with the SOD-mimetic Tempol (a membrane-permeable radical scavenger) or the NO donor sodium nitroprusside (SNP). Moreover, the neovascularization defect in CuZnSOD-deficient mice could be rescued by wild-type (but not CuZnSOD-deficient) EPC supplementation.
  
  
  CONCLUSIONS
  Protection against oxidative stress by CuZnSOD may be essential for EPC function and reparative neovascularization after ischemia.
authors: Department of Cardiovascular Research, Centre Hospitalier de l'Université de Montréal, 1560 Sherbrooke E, Montréal, Qc H2L 4M1, Canada.
authors: Jessika
authors: J
authors: Groleau
authors: Sylvie
authors: S
authors: Dussault
authors: Paola
authors: P
authors: Haddad
authors: Julie
authors: J
authors: Turgeon
authors: Catherine
authors: C
authors: Ménard
authors: John S
authors: JS
authors: Chan
authors: Alain
authors: A
authors: Rivard
mesh_terms: D000818:Animals; D001854:Bone Marrow Cells; D002196:Capillaries / Q000503:physiopathology; D004195:Disease Models, Animal; D042783:Endothelial Cells / Q000502:physiology*; D005260:Female; D006614:Hindlimb / Q000098:blood supply*; D007511:Ischemia / Q000503:physiopathology*; D017078:Laser-Doppler Flowmetry; D008297:Male; D051379:Mice; D018919:Neovascularization, Physiologic / Q000502:physiology*; D018384:Oxidative Stress; D013234:Stem Cells / Q000502:physiology*; D013482:Superoxide Dismutase / Q000502:physiology*
chemical_list: D013482:Superoxide Dismutase