title: Human adult bone marrow-derived stem cells decrease severity of lipopolysaccharide-induced acute respiratory distress syndrome in sheep.
abstract: BACKGROUND
  Acute respiratory distress syndrome (ARDS) is the most common cause of respiratory failure among critically ill subjects, sepsis and severe bacterial pneumonia being its most common causes. The only interventions that have proven beneficial are protective ventilation strategies and fluid conservation approaches. New therapies are needed to address this common clinical problem. Others and we have previously shown the beneficial effect of infusion of exogenous adult stem cells in different pre-clinical models of ARDS.
  
  
  METHODS
  In the present study endotoxin was infused intravenously into 14 sheep from which 6 received different doses of adult stem cells by intrabronchial delivery to evaluate the effect of stem cell therapy.
  
  
  RESULTS
  After administration of endotoxin, there was a rapid decline in oxygenation to hypoxemic values, indicative of severe-to-moderate ARDS. None of the animals treated with saline solution recovered to normal baseline values during the 6 hours that the animals were followed. In contrast, sheep treated with a dose of 40 million adult stem cells returned their levels of oxygen in their blood to baseline two hours after the cells were infused. Similarly, improvements in carbon dioxide (CO2) clearance, pulmonary vascular pressures and inflammation were observed and confirmed by histology and by the decrease in lung edema.
  
  
  CONCLUSIONS
  We concluded that instillation of adult non-hematopoietic stem cells can diminish the impact of endotoxin and accelerate recovery of oxygenation, CO2 removal and inflammation in the ovine model, making the use of adult stem cells a real alternative for future therapies for ARDS.
authors.forename: Mauricio
authors.initials: M
authors.lastname: Rojas
authors.forename: Nayra
authors.initials: N
authors.lastname: Cárdenes
authors.forename: Ergin
authors.initials: E
authors.lastname: Kocyildirim
authors.forename: John R
authors.initials: JR
authors.lastname: Tedrow
authors.forename: Eder
authors.initials: E
authors.lastname: Cáceres
authors.forename: Robert
authors.initials: R
authors.lastname: Deans
authors.forename: Anthony
authors.initials: A
authors.lastname: Ting
authors.forename: Christian
authors.initials: C
authors.lastname: Bermúdez
mesh_terms: D053687:Adult Stem Cells / Q000166:cytology*; D000818:Animals; D001854:Bone Marrow Cells / Q000166:cytology*; D016026:Bone Marrow Transplantation / Q000379:methods*; D004195:Disease Models, Animal; D006801:Humans; D008070:Lipopolysaccharides; D012128:Respiratory Distress Syndrome / Q000139:chemically induced / Q000628:therapy*; D012756:Sheep; D033581:Stem Cell Transplantation / Q000379:methods*
chemical_list: D008070:Lipopolysaccharides