A pilot study to investigate the balance between proteases and α1-antitrypsin in bronchoalveolar lavage fluid of lung transplant recipients

Maddalena Cagnone, Davide Piloni, Ilaria Ferrarotti, Monica Di Venere, Simona Viglio, Sara Magni, Anna Bardoni, Roberta Salvini, Marco Fumagalli, Paolo Iadarola, Sabrina Martinello, Federica Meloni

Research output: Contribution to journalArticlepeer-review

Abstract

The neutrophilic component in bronchiolitis obliterans syndrome (BOS, the main form of chronic lung rejection), plays a crucial role in the pathogenesis and maintenance of the disorder. Human Neutrophil Elastase (HNE), a serine protease responsible of elastin degradation whose action is counteracted by α1-antitrypsin (AAT), a serum inhibitor specific for this protease. This work aimed to investigate the relationship between HNE and AAT in bronchoalveolar lavage fluid (BALf) from stable lung transplant recipients and BOS patients to understand whether the imbalance between proteases and inhibitors is relevant to the development of BOS. To reach this goal a multidisciplinary procedure was applied which included: (i) the use of electrophoresis/western blotting coupled with liquid chromatography-mass spectrometric analysis; (ii) the functional evaluation of the residual antiprotease activity, and (iii) a neutrophil count. The results of these experiments demonstrated, for the first time, the presence of the complex between HNE and AAT in a number of BALf samples. The lack of this complex in a few specimens analyzed was investigated in relation to a patient’s lung inflammation. The neutrophil count and the determination of HNE and AAT activities allowed us to speculate that the presence of the complex correlated with the level of lung inflammation.

Original languageEnglish
Article number5
JournalHigh-Throughput
Volume8
Issue number1
DOIs
Publication statusPublished - Mar 1 2019

Keywords

  • Alpha 1-antitrypsin
  • Bronchiolitis obliterans syndrome
  • Bronchoalveolar lavage fluid
  • Elastase
  • Lung
  • Neutrophils

ASJC Scopus subject areas

  • Biotechnology
  • Bioengineering
  • Biochemistry
  • Biomedical Engineering

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