title: IGF1 and IGFBP3 in acute respiratory distress syndrome.
abstract: OBJECTIVE
  IGF1 and its most abundant binding protein, IGF-binding protein 3 (IGFBP3), have been implicated in fibrotic lung diseases and persistent acute respiratory distress syndrome (ARDS) due to profibrogenic and antiapoptotic activity. Whether circulating levels of IGF1 and IGFBP3 are altered in ARDS and whether they predict progression of and survival from ARDS remains unknown. This study aims to characterize the circulating levels of IGF1 and IGFBP3 in patients at risk for ARDS in relation to i) development of ARDS and ii) mortality among ARDS cases.
  
  
  METHODS
  In this case-cohort study, consecutive patients with risk factors for ARDS admitted to the intensive care unit were enrolled and followed prospectively for the development of ARDS. Cases were followed for all-cause mortality through day 60. Of the 2397 patients enrolled in the parent study, plasma samples were available in 531 (22%) patients (356 controls and 175 cases) from early in presentation. Total plasma IGF1 and IGFBP3 levels were measured.
  
  
  RESULTS
  After adjusting for relevant clinical covariates including severity of illness, IGF1 and IGFBP3 levels were significantly lower in ARDS cases than in controls (odds ratio (OR), 0.58; P=0.006; OR, 0.57; P=0.0015 respectively). Among the ARDS cases, IGF1 and IGFBP3 levels were significantly lower in the 78 (45%) non-survivors (hazard ratio (HR), 0.70; P=0.024; HR, 0.69; P=0.021 respectively).
  
  
  CONCLUSIONS
  Lower circulating levels of IGF1 and IGFBP3 were independently associated with ARDS case status. Furthermore, lower levels were associated with mortality among the ARDS cases. These data support the role of the IGF pathway in ARDS.
authors: Section of Pulmonary and Critical Care Medicine, Department of Medicine, Yale University School of Medicine, 300 Cedar Street, PO Box 208057, New Haven, Connecticut 06520-8057, USA. amy.ahasic@yale.edu
authors: Amy M
authors: AM
authors: Ahasic
authors: Rihong
authors: R
authors: Zhai
authors: Li
authors: L
authors: Su
authors: Yang
authors: Y
authors: Zhao
authors: Konstantinos N
authors: KN
authors: Aronis
authors: B Taylor
authors: BT
authors: Thompson
authors: Christos S
authors: CS
authors: Mantzoros
authors: David C
authors: DC
authors: Christiani
mesh_terms: D000328:Adult; D000368:Aged; D005260:Female; D006801:Humans; D018972:Insulin-Like Growth Factor Binding Protein 3 / Q000097:blood*; D007334:Insulin-Like Growth Factor I / Q000378:metabolism*; D008297:Male; D008875:Middle Aged; D012128:Respiratory Distress Syndrome / Q000097:blood* / Q000378:metabolism* / Q000401:mortality; D012307:Risk Factors
chemical_list: D018972:Insulin-Like Growth Factor Binding Protein 3; D007334:Insulin-Like Growth Factor I