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Appl Environ Microbiol. Feb 1997; 63(2): 513–518.
PMCID: PMC168342

Antagonistic activity exerted in vitro and in vivo by Lactobacillus casei (strain GG) against Salmonella typhimurium C5 infection.

Abstract

The aim of this study was to compare the antagonistic properties of Lactobacillus casei GG exerted in vitro against Salmonella typhimurium C5 in a cellular model, cultured enterocyte-like Caco-2 cells, to those exerted in vivo in an animal model, C3H/He/Oujco mice. Our results show that a 1-h contact between the invading strain C5 and either the culture or the supernatant of L. casei GG impeded the invasion by the Salmonella strain in Caco-2 cells, without modifying the viability of the strain. After neutralization at pH 7, no inhibition of the invasion by C5 was observed. The antagonistic activity of L. casei GG was examined in C3H/He/Oujco mice orally infected with C5 as follows: (i) L. casei GG was given daily to conventional animals as a probiotic, and (ii) it was given once to germ-free animals in order to study the effect of the population of L. casei GG established in the different segments of the gut. In vivo experiments show that after a single challenge with C5, this strain survives and persists at a higher level in the feces of the untreated conventional mice than in those of the treated group. In L. casei GG germ-free mice, establishment of L. casei GG in the gut significantly delayed the occurrence of 100% mortality of the animals (15 days after C5 challenge versus 9 days in germ-free mice [P < 0.01]). Cecal colonization level and translocation rate of C5 to the mesenteric lymph nodes, spleen, and liver were significantly reduced during the first 2 days post-C5 challenge, although the L. casei GG population level in the gut dramatically decreased in these animals.

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Selected References

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