title: Parathyroid hormone-related protein in epithelial lining fluid in humans negatively correlates with the severity of lung injury.
abstract: OBJECTIVE
  To determine the concentration of parathyroid hormone-related protein (PTHrP; an autocrine/paracrine regulator of type-2 alveolar epithelial cells proliferation and apoptosis) in the epithelial lining fluid (ELF) from patients without pulmonary disease and from patients with acute lung injury (ALI), and to evaluate whether PTHrP concentrations correlated with the intensity of lung injury.
  
  
  METHODS
  Prospective study.
  
  
  METHODS
  An adult trauma/surgical ICU in an urban teaching hospital.
  
  
  METHODS
  A total of 20 patients with ALI receiving mechanical ventilation (patients), and 10 patients without pulmonary disease not receiving mechanical ventilation (control subjects).
  
  
  METHODS
  None.
  
  
  RESULTS
  PTHrP was detected in all BAL fluids, and ELF PTHrP concentrations (median; 25% to 75% percentiles) tended to be higher in patients (52.2 nmol/mL; 20.8 to 65.6 nmol/mL) than in control subjects (25.4 nmol/mL; 20.5 to 35.4 nmol/mL; p = 0.18). In patients, ELF PTHrP concentration correlated positively with the PaO(2)/fraction of inspired oxygen ratio (r = 0.53; p = 0.005), and negatively with lung injury score (r = - 0.44; p = 0.02), radiologic score (r = - 0.40; p = 0.04), and BAL albumin concentration (r = - 0.42; p = 0.02).
  
  
  CONCLUSIONS
  PTHrP is present in biologically significant concentrations in the alveolar milieu in humans. In patients with ALI, the PTHrP concentration correlates negatively with the degree of lung injury.
authors.affiliation: INSERM U408, Hôpital Lariboisière (Assistance Publique - Hôpitaux de Paris), Paris, France.
authors.forename: Jean-Baptiste
authors.initials: JB
authors.lastname: Stern
authors.forename: Oana
authors.initials: O
authors.lastname: Bernard
authors.forename: Catherine
authors.initials: C
authors.lastname: Paugam
authors.forename: Caroline
authors.initials: C
authors.lastname: Silve
authors.forename: Jean
authors.initials: J
authors.lastname: Mantz
authors.forename: Michel
authors.initials: M
authors.lastname: Aubier
authors.forename: Bruno
authors.initials: B
authors.lastname: Crestani
mesh_terms: D000208:Acute Disease; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001992:Bronchoalveolar Lavage Fluid / Q000737:chemistry*; D004848:Epithelium; D005260:Female; D006801:Humans; D008168:Lung / Q000378:metabolism; D055370:Lung Injury; D008297:Male; D008875:Middle Aged; D010281:Parathyroid Hormone / Q000032:analysis*; D044162:Parathyroid Hormone-Related Protein; D011446:Prospective Studies; D011506:Proteins / Q000032:analysis*; D011650:Pulmonary Alveoli / Q000166:cytology / Q000473:pathology*
chemical_list: C470121:PTHLH protein, human; D010281:Parathyroid Hormone; D044162:Parathyroid Hormone-Related Protein; D011506:Proteins