1887

Abstract

New biological strategies for the treatment of infection are needed in response to the increase in antibiotic-resistant strains. L1000 and RBL67 were previously shown to produce antimicrobial proteinaceous compounds (microcin B17 and thermophilicin B67, respectively) active against a panel of strains recently isolated from clinical cases in Switzerland. In this study, two three-stage intestinal continuous fermentation models of colonization inoculated with immobilized faeces of a two-year-old child were implemented to study the effects of the two bacteriocinogenic strains compared with a bacteriocin-negative mutant of strain L1000 on growth, as well as gut microbiota composition and metabolic activity. Immobilized L1000 added to the proximal colon reactor showed a low colonization, and developed preferentially in the distal colon reactor independent of the presence of genetic determinants for microcin B17 production. Surprisingly, L1000 addition strongly stimulated growth in all three reactors. In contrast, RBL67 added in a second phase stabilized at high levels in all reactors, but could not inhibit already present at a high level (>10 c.f.u. ml) when the probiotic was added. Inulin added at the end of fermentation induced a strong bifidogenic effect in all three colon reactors and a significant increase of counts in the distal colon reactor. Our data show that under the simulated child colonic conditions, the microcin B17 production phenotype does not correlate with inhibition of but leads to a better colonization of L1000 in the distal colon reactor. We conclude that models with complex and complete gut microbiota are required to accurately assess the potential and efficacy of probiotics with respect to colonization in the gut.

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2010-11-01
2024-12-06
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