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Aeromonas spp.-mediated cell-contact cytotoxicity is associated with the presence of type III secretion system

Sylwia Krzymińska1, Joanna Mokracka, Ryszard Koczura

  • 1Department of Microbiology, Faculty of Biology A. Mickiewicz University, 61-614 Poznań, ul. Umultowska 89, Poznan, Poland. sylkrzym@amu.edu.pl

Antonie Van Leeuwenhoek
|August 3, 2011
PubMed

Insights

Aeromonas species causing gastroenteritis produce toxins. Their cell-contact cytotoxicity is linked to the type III secretion system (TTSS), crucial for bacterial invasion and host cell damage.

Area of Science:

  • Microbiology
  • Pathogenesis
  • Bacterial Toxinology

Background:

  • Aeromonas spp. are significant causes of bacterial gastroenteritis.
  • Understanding the virulence factors of Aeromonas is critical for disease management.

Purpose of the Study:

  • To investigate the production of cytotonic and cytotoxic toxins in Aeromonas spp.
  • To determine the association between the type III secretion system (TTSS) and bacterial cytotoxicity.

Main Methods:

  • Analysis of 64 Aeromonas spp. strains from gastroenteritis patients.
  • Assessment of cytotonic and cytotoxic activities.
  • Detection of the type III secretion system (TTSS).

Main Results:

  • Cell-contact cytotoxicity strongly correlated with the presence of TTSS.
  • Cell-free supernatants showed cytotoxicity after 24h incubation, destroying HEp-2 cells.
  • 44% of strains were cytotonic to CHO cells, and 46% invaded epithelial cells.

Conclusions:

  • TTSS is a key factor in Aeromonas-induced cytotoxicity and epithelial cell invasion.
  • Aeromonas strains possess diverse virulence mechanisms contributing to gastroenteritis.

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