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ABSTRACT: Lactobacillus rhamnosus GG modifies the metabolome of pathobionts in gnotobiotic mice

PROVIDER: PRJNA655706 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR12402918.fastq.gz	Fastqsanger.gz
	SRR12402919.fastq.gz	Fastqsanger.gz
	SRR12402920.fastq.gz	Fastqsanger.gz
	SRR12402921.fastq.gz	Fastqsanger.gz
	SRR12402922.fastq.gz	Fastqsanger.gz

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Lactobacillus rhamnosus GG modifies the metabolome of pathobionts in gnotobiotic mice

Project description:Lactobacillus rhamnosus GG (LGG) is the most widely used probiotic, but the mechanisms underlying its beneficial effects remain unresolved. Previous studies typically inoculated LGG in hosts with established gut microbiota, limiting the understanding of specific impacts of LGG on host due to numerous interactions among LGG, commensal microbes, and the host. There has been a scarcity of studies that used gnotobiotic animals to elucidate LGG-host interaction, in particular for gaining specific insights about how it modifies metabolome. To evaluate whether LGG affects the metabolite output of pathobionts, we inoculated LGG into gnotobiotic mice along with a gut-disruptive consortium containing Propionibacterium acnes, Turicibacter sanguinis, and Staphylococcus aureus (PTS).

2020-08-07 | MSV000085927 | MassIVE

Synbiotic impact of tagatose on viability of Lactobacillus rhamnosus strain GG mediated by the phosphotransferase system (PTS)

Project description:The presence of tagatose in Lactobacillus rhamnosus strain GG caused induction of a large number of genes associated with carbohydrate metabolism including the phosphotransferase system. In addition, these results indicate the tagatose enhanced the growth of Lactobacillus casei 01 and Lactobacillus rhamnosus strain GG and their probiotic activities by activating tagatose-associated PTS networks. Two-condition experiment, Lactobacillus rhamnosus GG with glucose vs. Lactobacillus rhamnosus GG with tagatose. For preparing the total RNA, Lactobacillus rhamnosus GG cells were grown at 37M-BM-0C in prebiotic minimum medium supplemented with 2% glucose or tagatose for 24 h.

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GNPS - Lactobacillus rhamnosus GG modifies the metabolome of pathobionts in gnotobiotic mice

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A microfluidics-based in vitro model of the gastrointestinal human-microbe interface

Project description:We have developed a microfluidics-based in vitro model of the human gut allowing co-culture of human and microbial cells and subsequent multi-omic assessment of the effect of the co-culture on the host transcriptome. We compare the transcriptional changes induced in the human epithelial cell line, Caco-2 after co-culture with Lactobacillus rhamnosus GG or a consortium of Lactobacillus rhamnosus GG and Bacteroides caccae.

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Project description:Transcriptional profiling of probiotic Lactobacillus rhamnosus strain GG mid-exponential pH-controlled bioreactor cultures before and after exposure to bovine bile (0.2% ox gall). Keywords: bile, stress response Cell samples from four biological replicates were harvested right before (time point 0 min) and 10, 30 and 120 min after bile treatment. Each sample was compared to a common reference sample (time point 0 min, mid-exponential growth phase Lactobacillus rhamnosus GG cultures). A total of 12 hybridizations were performed using balanced dye-swap design. Dyes were balanced between compared sample pairs and between biological replicates.

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Project description:Lactobacillus rhamnosus GG has become one of the most widely marketed and studied probiotic strains. Several genes important for probiotic function have been identified, including the spaCBA-srtC1 gene cluster encoding pili, which have been shown to be important for certain of its probiotic properties. The spaCBA-srtC1 gene cluster has been reported to be unstable in L. rhamnosus GG isolated from liquid dairy products and therefore the present study examined the L. rhamnosus GG genome stability throughout an industrial production process from the original deposit to the freeze-dried products including intermediate fermentations and single colony isolates prepared from these samples. The results showed that the original deposit was identical to the reference ATCC and that the genome sequence stayed fully intact throughout the production process. No SNPs or larger genomic changes occurred in any of the samples throughout the production process and the spaCBA-srtC1 gene locus was fully conserved and intact in all 31 samples examined. In addition, phenotypic expression of pili was demonstrated using immune-gold labelling EM. The images showed that pili production was preserved throughout the production process and that the number of pili were consistent in all batches. The present study extends the scope of previous findings to an industrial setting and shows that the region around the spaCBA-srtC1 cluster exhibits high stability in L. rhamnosus GG in an industrial production process.

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