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. 1995 Dec;63(12):4837–4848. doi: 10.1128/iai.63.12.4837-4848.1995

Pathogenesis of defined invasion mutants of Yersinia enterocolitica in a BALB/c mouse model of infection.

J C Pepe 1, M R Wachtel 1, E Wagar 1, V L Miller 1
PMCID: PMC173693  PMID: 7591144

Abstract

It has been hypothesized for many years that the ability of Yersinia spp. to invade tissue culture cells is reflective of their ability to penetrate the intestinal epithelium and that this capacity is an important aspect of the disease process. Three different genes from Yersinia spp. that are involved in the tissue culture invasion phenotype have been identified: inv, ail, and yadA. It was previously shown that inv is necessary for efficient penetration of the intestinal epithelium by Yersinia enterocolitica. The present study was initiated to determine whether other known Yersinia invasion factors could promote uptake of the bacteria by mice in the absence of invasion. In addition, the roles of these three invasion factors in the survival of the bacteria, lethality for mice, and development of pathology were compared. We found that YadA is necessary for persistence of Y. enterocolitica in Peyer's patches, and consistent with this observation, the yadA mutant was avirulent for mice infected either orally or intraperitoneally. In addition, the inv yadA double mutant was avirulent. Histological and immunohistological examination of the Peyer's patches of infected mice indicated that despite the presence of large numbers of CFU at 24 h the yadA and ail yadA mutants cause only minimal pathology and recruitment of macrophages. At 42 h postinfection, Peyer's patches from mice infected with the inv mutant showed no pathology, despite the prediction that some of the mice by this time would be colonized. However, at 72 h, inflammation and necrosis were evident in some Peyer's patches. Together, these observations suggest that for visible pathology to develop, a threshold number of bacteria (> 10(5)) is needed and the bacteria need to persist for more than 24 h. Lastly, YadA but not Ail may play a role in the less efficient, delayed invasion of the intestinal epithelium observed for the inv mutant.

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Selected References

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