Compensatory lung growth after bilobectomy in emphysematous rats

PLoS One. 2017 Jul 27;12(7):e0181819. doi: 10.1371/journal.pone.0181819. eCollection 2017.

Abstract

Lung volume reduction surgery (LVRS) is an option for emphysematous patients who are awaiting lung transplantation. LVRS reduces nonfunctional portions of lung tissues and favors the compensatory lung growth (CLG) of the remaining lobes. This phenomenon diminishes dyspnea and improves both the respiratory mechanics and quality of life for the patients. An animal model of elastase-induced pulmonary emphysema was used to investigate the structural and functional lung response after LVRS. Bilobectomy was performed six weeks after elastase instillation. Two weeks after bilobectomy, CLG effects were evaluated by lung mechanics and histomorphometric analysis. After bilobectomy, the emphysematous animals presented decreased mean linear intercepts, increased elastic fiber proportion, and increased alveolar surface density, total volumes of airspace, tissue and respiratory region and absolute surface area. We conclude that bilobectomy promoted CLG in emphysematous animals, resulting in alveolar architecture repair.

MeSH terms

  • Animals
  • Arteries / pathology
  • Bronchoalveolar Lavage Fluid
  • Collagen / metabolism
  • Elasticity
  • Hypertension / complications
  • Hypertension / physiopathology
  • Image Processing, Computer-Assisted
  • Inflammation / complications
  • Inflammation / pathology
  • Lung / growth & development*
  • Lung / pathology
  • Lung / physiopathology
  • Lung / surgery*
  • Male
  • Organ Size
  • Pneumonectomy*
  • Pulmonary Emphysema / physiopathology
  • Pulmonary Emphysema / surgery*
  • Rats, Wistar
  • Respiratory Mechanics
  • Vascular Endothelial Growth Factor A / metabolism

Substances

  • Vascular Endothelial Growth Factor A
  • Collagen

Grants and funding

FMA holds a CAPES MSc fellowship. RPV holds a Post-doctoral fellowship from European Respiratory Society/Marie Curie Actions/European Union – 7th Framework Program.