title: Comparison of treatments of peripheral arterial disease with mesenchymal stromal cells and mesenchymal stromal cells modified with granulocyte and macrophage colony-stimulating factor.
abstract: OBJECTIVE
  Granulocyte macrophage-colony stimulating factor (GM-CSF) promotes vessel formation through several molecular signaling pathways. Mesenchymal stromal cells (MSCs) have an important role in neovasculogenesis during ischemia because they release pro-angiogenic paracrine factors, pro-survival and immunomodulatory substances and can differentiate into endothelial cells. The objective of this study was to evaluate whether there is synergy between GM-CSF and MSCs in recovering ischemic limbs.
  
  
  METHODS
  MSCs from mouse bone marrow were transduced with a lentiviral vector expressing GM-CSF and injected into animals with surgically induced limb ischemia, with unmodified MCSs used as control. The evolution of limb necrosis was evaluated for 1 month. Muscle strength was assessed on the 30th day, and the animals were euthanized to determine the muscle mass and to perform histological analyses to determine the degree of cellular infiltration, capillary and microvessel densities, fibrosis, necrosis and tissue regeneration.
  
  
  RESULTS
  Both treatments were able to ameliorate ischemia, decrease the areas of fibrosis, necrosis, adipocytes and leukocyte infiltrates and increase the number of capillaries. The addition of GM-CSF promoted the formation of larger vessels, but it also resulted in more fibrosis and less muscle mass without affecting muscle force.
  
  
  CONCLUSIONS
  Both treatments resulted in a remarkable amelioration of ischemia. More fibrosis and less muscle mass produced by the overexpression of GM-CSF did not affect muscle functionality significantly. Importantly, MSCs overexpressing GM-CSF produced larger vessels, which is an important long-term advantage because larger vessels are more efficient in the reperfusion of ischemic tissues physiologically.
authors: Department of Biophysics, Universidade Federal de São Paulo, São Paulo-SP, Brazil.
authors: Flavia Franco
authors: FF
authors: da Cunha
authors: Leonardo
authors: L
authors: Martins
authors: Priscila Keiko Matsumoto
authors: PK
authors: Martin
authors: Roberta Sessa
authors: RS
authors: Stilhano
authors: Edgar Julian
authors: EJ
authors: Paredes Gamero
authors: Sang Won
authors: SW
authors: Han
mesh_terms: D000818:Animals; D001854:Bone Marrow Cells / Q000166:cytology / Q000378:metabolism; D005121:Extremities / Q000098:blood supply / Q000473:pathology; D016178:Granulocyte-Macrophage Colony-Stimulating Factor / Q000235:genetics / Q000378:metabolism*; D007511:Ischemia / Q000473:pathology / Q000628:therapy; D045164:Mesenchymal Stem Cell Transplantation; D059630:Mesenchymal Stem Cells / Q000166:cytology* / Q000378:metabolism; D051379:Mice; D009336:Necrosis / Q000473:pathology / Q000628:therapy; D058729:Peripheral Arterial Disease / Q000473:pathology / Q000628:therapy*; D011994:Recombinant Proteins / Q000235:genetics / Q000378:metabolism; D015398:Signal Transduction
chemical_list: D011994:Recombinant Proteins; D016178:Granulocyte-Macrophage Colony-Stimulating Factor