Evaluation of in vitro antagonism and of in vivo immune modulation and protection against pathogenic experimental challenge of two probiotic strains of Bifidobacterium animalis var. lactis

The aim of the present study was to compare the effect of intragastric administration with two strains of Bifidobacterium animalis subsp. lactis (Bifido A and Bifido B), in gnotobiotic and conventional mice, challenged with Salmonella Typhimurium. In vitro antagonism test showed that the two strains...

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Veröffentlicht in:Archives of microbiology 2010-12, Vol.192 (12), p.995-1003
Hauptverfasser: Martins, Ariane K. S, Martins, Flaviano S, Gomes, Danielle A, Elian, Samir D. A, Vieira, Angélica T, Teixeira, Mauro M, Cara, Denise C, Nardi, Regina M. D, Nicoli, Jacques R
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container_end_page 1003
container_issue 12
container_start_page 995
container_title Archives of microbiology
container_volume 192
creator Martins, Ariane K. S
Martins, Flaviano S
Gomes, Danielle A
Elian, Samir D. A
Vieira, Angélica T
Teixeira, Mauro M
Cara, Denise C
Nardi, Regina M. D
Nicoli, Jacques R
description The aim of the present study was to compare the effect of intragastric administration with two strains of Bifidobacterium animalis subsp. lactis (Bifido A and Bifido B), in gnotobiotic and conventional mice, challenged with Salmonella Typhimurium. In vitro antagonism test showed that the two strains were able to produce antagonistic substances against various pathogenic microorganisms. In an ex vivo antagonism test the production of antagonistic substances was observed only against three out ten pathogens tested. Both Bifidobacterium strains were able to colonize and to maintain high population levels in the digestive tract of gnotobiotic mice. In addition, the two strains had low and limited translocation ability and did not cause any histological lesion in any of the organs analyzed. Both strains were able to reduce the fecal number of Salmonella in gnotobiotic mice challenged with the pathogen, but only Bifido B was able to confer a protection as demonstrated by a lower mortality. Higher levels of sIgA and IL-10 were observed only in Bifido B mono-associated mice when compared to germ free group. We could conclude that, among the parameters analyzed, the strain Bifido B exhibited the more desirable characteristics to be used as a probiotic.
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subjects Animals
Antagonism
Antibiosis
Bacterial Load
Bacterial Translocation
Bacteriology
Bifidobacterium - immunology
Bifidobacterium animalis
Bifidobacterium animalis subsp. lactis
Biochemistry
Biological and medical sciences
Biomedical and Life Sciences
Biotechnology
Cell Biology
Digestive tract
Ecology
Feces - microbiology
Fundamental and applied biological sciences. Psychology
Germ-Free Life
Gnotobiotics
IL-10
Immunoglobulin A, Secretory - immunology
Immunomodulation
Interleukin 10
Interleukin-10 - immunology
Intestines - immunology
Intestines - microbiology
Intestines - pathology
Life Sciences
Mice
Microbial Ecology
Microbiology
Microorganisms
Miscellaneous
Mortality
Original Paper
Pathogens
Population levels
Probiotics
Salmonella enterica subsp. enterica serovar Typhimurium
Salmonella Infections - immunology
Salmonella typhimurium
Salmonella typhimurium - pathogenicity
sIgA
Translocation
title Evaluation of in vitro antagonism and of in vivo immune modulation and protection against pathogenic experimental challenge of two probiotic strains of Bifidobacterium animalis var. lactis
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