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Effect of peptidases secreted by the opportunistic pathogen Scedosporium aurantiacum on human epithelial cells.

Authors
  • Han, Zhiping1
  • Kautto, Liisa1, 2
  • Meyer, Wieland3
  • Chen, Sharon C-A3, 4
  • Nevalainen, Helena1, 2
  • 1 Department of Molecular Sciences, Macquarie University, Sydney, Australia. , (Australia)
  • 2 Biomolecular Discovery and Design Research Centre, Macquarie University, Sydney, Australia. , (Australia)
  • 3 Molecular Mycology Research Laboratory, Centre for Infectious Diseases and Microbiology, Marie Bashir Institute for Infectious Diseases and Biosecurity, Sydney Medical School - Westmead Hospital, The University of Sydney, Westmead Institute for Medical Research, Sydney, Australia. , (Australia)
  • 4 Centre for Infectious Diseases and Microbiology Laboratory Services, ICPMR, New South Wales Health Pathology, Westmead Hospital, Westmead, NSW, Australia. , (Australia)
Type
Published Article
Journal
Canadian Journal of Microbiology
Publisher
Canadian Science Publishing
Publication Date
Nov 01, 2019
Volume
65
Issue
11
Pages
814–822
Identifiers
DOI: 10.1139/cjm-2019-0212
PMID: 31265796
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

Peptidases secreted by a clinical high-virulence Scedosporium aurantiacum isolate (strain WM 06.482; CBS 136046) under normoxic and hypoxic conditions were separated via size-exclusion chromatography, and peptidase activities present in each fraction were determined using class-specific substrates. The fractions demonstrating peptidase activity were assessed for their effects on the attachment and viability of A549 human lung epithelial cells in vitro. Of the peptidases detected in the size-exclusion chromatography fractions, the elastase-like peptidase reduced cell viability, the chymotrypsin-like peptidase was associated with cell detachment, and the cysteine peptidases were able to abolish both cell attachment and viability. The loss of cell viability and attachment became more prominent with an increase in the peptidase activity and could also be specifically prevented by addition of class-specific peptidase inhibitors. Our findings indicate that peptidases secreted by S. aurantiacum can breach the human alveolar epithelial cell barrier and, thus, may have a role in the pathobiology of the organism.

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