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Influence of exposure time on gene expression of human intestinal epithelial cells exposed to Lactobacillus acidophilus

ABSTRACT: The Caco-2 epithelial cell line was exposed to the probiotic bacterium L. acidophilus cells for a 1-, 4- or 8-hour exposure time or phosphate-buffered saline (PBS) for 1 hour to study the impact on gene expression levels. The results indicated the effect of exposure time on gene expression levels.

ORGANISM(S): Homo sapiens

PROVIDER: GSE34175 | GEO | 2012/05/09

SECONDARY ACCESSION(S): PRJNA149683

REPOSITORIES: GEO

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Influence of exposure time on gene expression of human intestinal epithelial cells exposed to Lactobacillus acidophilus

Project description:The Caco-2 epithelial cell line was exposed to the probiotic bacterium L. acidophilus cells for a 1-, 4- or 8-hour exposure time or phosphate-buffered saline (PBS) for 1 hour to study the impact on gene expression levels. The results indicated the effect of exposure time on gene expression levels. Total RNA was isolated from the Caco-2 epithelial cell line after the required exposure time to L. acidophilus NCFM or PBS.

2012-05-08 | E-GEOD-34175 | biostudies-arrayexpress

Influence of environmental conditions and AI2 on the adhesion adaptive response of Lactobacillus acidophilus NCFM

Project description:This study reports an over 20-fold increase in the adhesive ability of Lactobacillus acidophilus NCFM to Caco-2 cells following a 1 hour incubation of cells that were concentrated ten-fold, immediately prior to adhesion. Microarray analysis of the global transcriptional response with and without exposure to the adhesion adaptive conditions revealed several genes potentially involved with adhesion to the intestinal epithelial cells and a classic stress response. Interestingly, putative genes linked to the synthesis of an interspecies signaling molecule, autoinducer-2 (AI-2), were overexpressed. Examination of the L. acidophilus NCFM genome revealed the complete pathway for AI-2 synthesis. AI-2 activity was detected in L. acidophilus NCFM during stationary growth phase using the Vibrio harveyi BB170 assay system. Using site-specific integration, an isogenic mutation was created in luxS and the resulting derivative of L. acidophilus NCFM did not produce AI-2. A 58 % decrease in adherence to Caco-2 cells was also observed by the LuxS- mutant when the cells were used for adhesion directly from logarithmic phase cultures. However, the LuxS- mutant strain still responded to adhesion adaptive conditions with significantly increased adherence indicating that additional factors contribute to the amplified adhesion response. Keywords: Culture response to specific environmental conditions

2010-02-09 | GSE5674 | GEO

Temporal gene expression and probiotic attributes of Lactobacillus acidophilus during growth in milk

Project description:Lactic acid bacteria have been used as starter strains in the production of fermented dairy products for centuries. Lactobacillus acidophilus is a widely recognized probiotic bacteria commonly added to yogurt and used in dietary supplements. In this study, a whole genome microarray was employed to monitor gene expression of L. acidophilus cells propagated in 11% skim milk (SM) during early, mid and late logarithmic phase, and stationary phase. Approximately 21% of 1,864 ORFs were differentially expressed at least in one time point. Genes differentially expressed in SM included several members of the proteolytic enzyme system. Expression of prtP (proteinase precursor) and prtM (maturase) increased over time as well as several peptidases and transport systems. Expression of Opp1 (oligopeptide transport system 1) was highest at 4h, while gene expression of Opp2 increased over time reaching its highest level at 12h, suggesting that the two systems have different specificities. Expression of a two-component regulatory system (2CRS), previously shown to regulate acid tolerance and proteolytic activity, also increased during the early log and early stationary phases of growth. Expression of the genes involved in lactose utilization increased immediately (5 min) upon exposure to milk. The acidification activity, survival under storage conditions, and adhesion to mucin and Caco-2 tissue culture cells of selected mutants containing insertionally inactivated genes differentially expressed in the wild-type strain during growth in milk were examined for any potential links between probiotic properties and bacterial growth and survival in milk. Some of the most interesting genes found to be expressed in milk were correlated with signaling (AI-2) and adherence to mucin and intestinal epithelial cells, in vitro.

2009-03-24 | GSE12924 | GEO

Genome-wide transcriptional profiling of Lactobacillus acidophilus stress response

Project description:We used a whole genome array containing 97.4 % of the annotated genes of Lactobacillus acidophilus NCFM, a probiotic culture that belongs to the lactic acid bacteria group, to identify genes that are differentially expressed under several stress conditions. Keywords: Stress response

2005-12-08 | GSE2782 | GEO

Metabolomic Profiling of Oxalate-Degrading Probiotic Lactobacillus acidophilus and Lactobacillus gasseri

Project description:Metabolomic and lipidomic profiling of Lactobacillus acidophilus and Lactobacillus gasseri to identify unique differences in their biochemistry that could potentially influence their ability to serve as probiotic agents for oxalate diseases.

2019-08-30 | ST001263 | MetabolomicsWorkbench

Lactobacillus acidophilus strain:S39 | isolate:S39

Project description:Probiotic trial of Lactobacillus acidophilus

| PRJNA342757 | ENA

Lactobacillus acidophilus induces virus immune defense genes in murine dendritic cells by a TLR-2 dependent mechanism

Project description:Lactobacilli are probiotics that, among other health promoting effects, have been ascribed immunostimulating and virus preventive properties. Certain lactobacilli species have been shown to possess strong IL-12 inducing properties. As IL-12 production depends on the up-regulation of type I interferons, we hypothesized that the strong IL-12 inducing capacity of L. acidophilus NCFM in murine bone marrow derived DC is caused by an up-regulation of IFN-β, which subsequently stimulates the induction of IL-12 and the dsRNA binding toll like receptor (TLR)-3. The expression of the genes encoding IFN-β, IL-12, IL-10 and TLR-3 in DC upon stimulation with L. acidophilus NCFM was measured. L. acidophilus NCFM induced a much stronger expression of ifn-β, il-12 and il-10 compared to the synthetic dsRNA ligand Poly I:C, whereas the levels of expressed tlr-3 were similar. By the use of whole genome microarray gene expression, we investigated whether other genes related to the viral defence were up-regulated in DC upon stimulation with L. acidophilus NCFM and found that various virus defence related genes, both early and late, were among the strongest up-regulated genes. The IFN-β stimulating capability was also detected in another L. acidophilus strain, but was not a property of other probiotic bacteria tested (B. bifidum and E. coli nissle).The IFN-β inducing capacity was markedly reduced in TLR-2 -/- DCs, dependent on endocytosis and the major cause of the induction of il-12 and tlr-3 in L. acidophilus NCFM stimulated cells. Collectively, our results reveal that certain lactobacilli trigger the expression of viral defence genes in DC in a TLR-2 manner through induction of IFN- β.

2009-10-08 | GSE18460 | GEO

Genome-wide transcriptional profiling of Lactobacillus acidophilus' response to bile

Project description:Lactobacillus acidophilus NCFM is an industrially important strain used extensively as a probiotic culture. Tolerance of the presence of bile is an attribute important to microbial survival in the intestinal tract. A whole-genome microarray was employed to examine the effects of bile on the global transcriptional profile of this strain, with the intention of elucidating genes contributing to bile tolerance. Genes involved in carbohydrate metabolism were generally induced, while genes involved in other aspects of cellular growth were mostly repressed. A 7-kb eight-gene operon encoding a two-component regulatory system (2CRS), a transporter, an oxidoreductase, and four hypothetical proteins was significantly upregulated in the presence of bile. Deletion mutations were constructed in six genes of the operon. Transcriptional analysis of the 2CRS mutants showed that mutation of the histidine protein kinase (HPK) had no effect on the induction of the operon, whereas the mutated response regulator (RR) showed enhanced induction when the cells were exposed to bile. These results indicate that the 2CRS plays a role in bile tolerance and that the operon it resides in is negatively controlled by the RR. Mutations in the transporter, the HPK, the RR, and a hypothetical protein each resulted in loss of tolerance of bile. Mutations in genes encoding another hypothetical protein and a putative oxidoreductase resulted in significant increases in bile tolerance. This functional analysis showed that the operon encoded proteins involved in both bile tolerance and bile sensitivity. Keywords: stress response We used a Reference Sample design, where each sample was compared using a dye swap to a common reference sample (early log-phase L. acidophilus cultures resuspended in fresh MRS [pH ~6.8]).

2008-04-04 | E-GEOD-11048 | biostudies-arrayexpress

Lactobacillus acidophilus NCFM

Project description:Temporal gene expression and probiotic attributes of Lactobacillus acidophilus during growth in milk

| PRJNA110839 | ENA

Lactobacillus acidophilus and Helicobacter pylori stimulation of bone marrow derived macrophage

Project description:Helicobacter pylori causes chronic gastritis and avoids elimination by the immune system of the infected host. The commensal bacterium Lactobacillus acidophilus has been reported to exert beneficial effects as a supplement during H. pylori eradication therapy. In the present study, we applied whole genome microarray analysis to compare the immune response induced in murine bone marrow derived macrophages (BMDM) stimulated with L. acidophilus, H. pylori, or with both bacteria in combination Microarray expression profiling was performed to analyze stimulation of bone marrow derived macrophages with Helicobacter pylori 251, Lactobacillus acidophilus NCFM or Lactobacillus acidophilus NCFM co-stimulated with Helicobacter pylori 251 were analyzed 5 hours after infection.

2013-07-02 | E-GEOD-42622 | biostudies-arrayexpress

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