Precolonized Human Commensal Escherichia coli Strains Serve as a Barrier to E. coli O157:H7 Growth in the Streptomycin-Treated Mouse Intestine
| Autor: | Paul S. Cohen, Regino Mercado-Lubo, Mary P. Leatham, Steven M. Autieri, Swati Banerjee, Tyrrell Conway |
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| Rok vydání: | 2009 |
| Předmět: |
Immunology
Colony Count Microbial Colonisation resistance Biology medicine.disease_cause Microbiology law.invention Feces Mice Probiotic law Antibiosis Escherichia coli medicine Animals Humans Pathogen Antibacterial agent Bacterial Infections biology.organism_classification Enterobacteriaceae Anti-Bacterial Agents Intestines Infectious Diseases Streptomycin Parasitology Bacteria |
| Zdroj: | Infection and Immunity. 77:2876-2886 |
| ISSN: | 1098-5522 0019-9567 |
| Popis: | Different Escherichia coli strains generally have the same metabolic capacity for growth on sugars in vitro, but they appear to use different sugars in the streptomycin-treated mouse intestine (Fabich et al., Infect. Immun. 76:1143-1152, 2008). Here, mice were precolonized with any of three human commensal strains ( E. coli MG1655, E. coli HS, or E. coli Nissle 1917) and 10 days later were fed 10 5 CFU of the same strains. While each precolonized strain nearly eliminated its isogenic strain, confirming that colonization resistance can be modeled in mice, each allowed growth of the other commensal strains to higher numbers, consistent with different commensal E. coli strains using different nutrients in the intestine. Mice were also precolonized with any of five commensal E. coli strains for 10 days and then were fed 10 5 CFU of E. coli EDL933, an O157:H7 pathogen. E. coli Nissle 1917 and E. coli EFC1 limited growth of E. coli EDL933 in the intestine (10 3 to 10 4 CFU/gram of feces), whereas E. coli MG1655, E. coli HS, and E. coli EFC2 allowed growth to higher numbers (10 6 to 10 7 CFU/gram of feces). Importantly, when E. coli EDL933 was fed to mice previously co-colonized with three E. coli strains (MG1655, HS, and Nissle 1917), it was eliminated from the intestine (E. coli strains can provide a barrier to infection and suggest that it may be possible to construct E. coli probiotic strains that prevent growth of pathogenic E. coli strains in the intestine. |
| Databáze: | OpenAIRE |
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