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1 School of Microbiology and Immunology, University of New South Wales, Sydney, Australia 2052
2 Centre for Biomedical Research, Faculty of Sciences, University of Southern Queensland, Toowoomba, Australia 4350
3 CSIRO Molecular Science, North Ryde, NSW, Australia 1670
4 Department of Histopathology, The General Infirmary at Leeds, Leeds LS1 3EX, UK
5 School of Quantitative Methods and Mathematical Sciences, University of Western Sydney, Campbelltown, NSW, Australia 2560
Correspondence
Stuart L. Hazell
s.hazell{at}usq.edu.au
Helicobacter pylori infects the human gastric mucosa and elicits an aggressive inflammatory response. Despite the severity of the inflammatory response, the bacterium is able to persist and cause a chronic infection. It is believed that antioxidant defence mechanisms enable this organism to persist. Wild-type H. pylori strain SS1, and KatA- and KapA-deficient mutants, were used to infect C57/BL6 mice to test this hypothesis. Neither KatA nor KapA was essential for the initial colonization of H. pylori SS1 in the murine model of infection. The wild-type SS1 colonized the gastric mucosa at significantly higher levels than both mutants throughout the 24-week experiment. Neither KatA- nor KapA-deficient mutants were able to maintain consistent ongoing colonization for the 24-week period, indicating the necessity of both KapA and KatA in sustaining a long-term infection. At 24 weeks, 5/10 mice inoculated with the KatA mutant and 2/10 mice inoculated with the KapA mutant were colonized, compared with 10/10 of the mice inoculated with the wild-type SS1. An increase in the severity of inflammation in the wild-type-inoculated mice appeared to correlate with the decline in colonization of animals inoculated with the mutants, suggesting that increased oxidative stress militated against continued infection by the mutants. These data indicate that KapA may be of equal or greater importance than KatA in terms of sustained infection on inflamed gastric mucosae.
Present address: Medical Microbiology, St Bartholomew's and The Royal London, Queen Mary's School of Medicine & Dentistry, University of London, UK.
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