title: Experimental heart failure induces alterations of the lung proteome--insight into molecular mechanisms.
abstract: BACKGROUND
  Heart failure (CHF) is characterized by dyspnea and pulmonary changes. The underlying molecular adaptations are unclear, but might provide targets for therapeutic interventions. We therefore conceived a study to determine molecular changes of early pulmonary stress failure in a model of tachycardia-induced heart failure.
  
  
  METHODS
  CHF was induced in rabbits by progessive right ventricular pacing (n=6). Invasive blood pressure measurements and echocardiography were repeatedly performed. Untreated animals served as controls (n=6). Pulmonary tissue specimens were subjected to two-dimensional gel electrophoresis, and differentially expressed proteins were identified by mass spectrometry. Selected proteins were validated by Western Blot analysis and localized by immunohistochemical staining.
  
  
  RESULTS
  CHF animals were characterized by significantly altered functional, morphological, and hemodynamic parameters. Upon proteomic profiling, a total of 33 proteins was found to be differentially expressed in pulmonary tissue of CHF animals (18 up-regulated, and 15 down-regulated) belonging to 4 functional groups: 1. proteins involved in maintaining cytoarchitectural integrity, 2. plasma proteins indicating impaired alveolar-capillary permeability, 3. proteins with antioxidative properties, and 4. proteins participating in the metabolism of selenium compounds
  
  
  CONCLUSIONS
  Experimental heart failure profoundly alters the pulmonary proteome. Our results supplement the current knowledge of pulmonary stress failure by specifying its molecular fundament.
authors.affiliation: Department of Internal Medicine II, University Hospital Regensburg, Regensburg, Germany.
authors.forename: Christoph
authors.initials: C
authors.lastname: Birner
authors.forename: Sarah
authors.initials: S
authors.lastname: Hierl
authors.forename: Alexander
authors.initials: A
authors.lastname: Dietl
authors.forename: Julian
authors.initials: J
authors.lastname: Hupf
authors.forename: Carsten
authors.initials: C
authors.lastname: Jungbauer
authors.forename: Peter M
authors.initials: PM
authors.lastname: Schmid
authors.forename: Petra
authors.initials: P
authors.lastname: Rümmele
authors.forename: Rainer
authors.initials: R
authors.lastname: Deutzmann
authors.forename: Günter
authors.initials: G
authors.lastname: Riegger
authors.forename: Andreas
authors.initials: A
authors.lastname: Luchner
mesh_terms: D000818:Animals; D004195:Disease Models, Animal; D006333:Heart Failure / Q000378:metabolism* / Q000473:pathology; D008168:Lung / Q000378:metabolism* / Q000473:pathology; D020543:Proteome / Q000378:metabolism*; D011817:Rabbits
chemical_list: D020543:Proteome