Pathogenicity island excision during an infection by Salmonella enterica serovar Enteritidis is required for crossing the intestinal epithelial barrier in mice to cause systemic infection

English version

Autoři: Catalina Pardo-Roa ^aff001; Geraldyne A. Salazar ^aff001; Loreani Noguera ^aff001; Francisco J. Salazar-Echegarai ^aff001; Omar P. Vallejos ^aff001; Isidora Suazo ^aff001; Bárbara M. Schultz ^aff001; Irenice Coronado-Arrazola ^aff001; Alexis M. Kalergis ^aff001; Susan M. Bueno ^aff001
Působiště autorů: Millennium Institute on Immunology and Immunotherapy, Departamento de Genética Molecular y Microbiología, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Santiago, Chile ^aff001; Departamento de Endocrinología, Facultad de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile ^aff002
Vyšlo v časopise: Pathogenicity island excision during an infection by Salmonella enterica serovar Enteritidis is required for crossing the intestinal epithelial barrier in mice to cause systemic infection. PLoS Pathog 15(12): e32767. doi:10.1371/journal.ppat.1008152
Kategorie: Research Article
doi: https://doi.org/10.1371/journal.ppat.1008152

Souhrn

Pathogenicity island excision is a phenomenon that occurs in several Salmonella enterica serovars and other members of the family Enterobacteriaceae. ROD21 is an excisable pathogenicity island found in the chromosome of S. Enteritidis, S. Dublin and S. Typhi among others, which contain several genes encoding virulence-associated proteins. Excision of ROD21 may play a role in the ability of S. Enteritidis to cause a systemic infection in mice. Our previous studies have shown that Salmonella strains unable to excise ROD21 display a reduced ability to colonize the liver and spleen. In this work, we determined the kinetics of ROD21 excision in vivo in C57BL/6 mice and its effect on virulence. We quantified bacterial burden and excision frequency in different portions of the digestive tract and internal organs throughout the infection. We observed that the frequency of ROD21 excision was significantly increased in the bacterial population colonizing mesenteric lymph nodes at early stages of the infective cycle, before 48 hours post-infection. In contrast, excision frequency remained very low in the liver and spleen at these stages. Interestingly, excision increased drastically after 48 h post infection, when intestinal re-infection and mortality begun. Moreover, we observed that the inability to excise ROD21 had a negative effect on S. Enteritidis capacity to translocate from the intestine to deeper organs, which correlates with an abnormal transcription of invA in the S. Enteritidis strain unable to excise ROD21. These results suggest that excision of ROD21 is a genetic mechanism required by S. Enteritidis to produce a successful invasion of the intestinal epithelium, a step required to generate systemic infection in mice.

Klíčová slova:

DNA transcription – Gastrointestinal infections – Gastrointestinal tract – Gene expression – Liver – Salmonella – Salmonellosis – Spleen

Zdroje

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