Lung injury and degradation of extracellular matrix components by aspergillus fumigatus serine proteinase

Paolo Iadarola, Giuseppe Lungarella, Piero A. Martorana, Simona Viglio, Maria Guglielminetti, Edward Korzus, Marina Gorrini, Eleonora Cavarra, Antonio Rossi, Jim Travis, Maurizio Luisetti

Research output: Contribution to journalArticlepeer-review

Abstract

Aspergillus fumigatus produces a variety of extracellular proteinases that are believed to be virulence factors towards Aspergillus-related lung disease. Among Aspergillus proteinases, the serine proteinase is thought to play a major virulent role because of its widespread production. Nevertheless, evidence of direct pulmonary injury caused by the A. fumigatus serine proteinase is still lacking. The purpose of our work was: (1) to provide evidence for a pivotal role of A. fumigatus serine proteinase in producing lung injury in an animal model, and (2) to investigate the broadness of the substrate specificity of the proteinase towards extracellular matrix components. To achieve this aim, the proteinase from an A. fumigatus strain isolated from human airways was purified by a four-step procedure, including cation exchange and hydrophobic interaction. High- performance capillary electrophoresis, SDS-PAGE, determination of K(m) towards synthetic substrates, and inhibitory studies were used to further characterize the A. fumigatus serine proteinase. With reference to extracellular matrix components, the A. fumigatus serine proteinase was shown to degrade human lung elastin at a higher rate than an equimolar amount of human neutrophil elastase. Human lung collagen, type I and type III collagens, as well as fibronectin, were quickly digested by the A. fumigatus serine proteinase. Finally, mice intratracheally injected with the proteinase showed a significant degree of lower respiratory tract destruction. We conclude that the A. fumigatus serine proteinase is capable per se of hydrolyzing the major structural barriers of the lung.

Original languageEnglish
Pages (from-to)233-251
Number of pages19
JournalExperimental Lung Research
Volume24
Issue number3
Publication statusPublished - 1998

Keywords

  • Alphal-proteinase inhibitor
  • Animal model of lung injury
  • Collagens
  • Elastin
  • Fibronectin

ASJC Scopus subject areas

  • Pulmonary and Respiratory Medicine

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