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Effect of probiotic Lactobacillus casei Zhang on liver gene expression of hypercholesterolemic rats

ABSTRACT: The hypocholesterolemic effect of probiotics has been observed, but the molecular mechanism of probiotic-host interaction is still obscure. In this study, DNA microarray technology was used to explore the gene expression profile of liver of hypercholesterolemic rats caused by administration of probiotic Lactobacillus casei Zhang, which can decrease the serum triglyceride, low-density lipoprotein cholesterol, hepatic cholesterol and triglyceride of hypercholesterolemic rats.

ORGANISM(S): Rattus norvegicus

PROVIDER: GSE23740 | GEO | 2011/12/31

SECONDARY ACCESSION(S): PRJNA130765

REPOSITORIES: GEO

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Effect of probiotic Lactobacillus casei Zhang on liver gene expression of hypercholesterolemic rats

Project description:The hypocholesterolemic effect of probiotics has been observed, but the molecular mechanism of probiotic-host interaction is still obscure. In this study, DNA microarray technology was used to explore the gene expression profile of liver of hypercholesterolemic rats caused by administration of probiotic Lactobacillus casei Zhang, which can decrease the serum triglyceride, low-density lipoprotein cholesterol, hepatic cholesterol and triglyceride of hypercholesterolemic rats. Six liver samples in high fat and probiotic treated group (3 samples in each group) were randomly selected for RNA isolation and microarray hybridization, the 3 samples in high fat group were used as control.

2011-12-31 | E-GEOD-23740 | biostudies-arrayexpress

Gene expression profile of Lactobacillus casei Zhang in fermented milk during transit in simulated gastrointestinal tract

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Transcriptome analysis of probiotic Lactobacillus casei Zhang during fermentation in soymilk

Project description:Lactobacillus casei Zhang is a probiotic bacterium isolated from koumiss in Inner Mongolia of China. Gene expression dynamics of L. casei Zhang during growth in soymilk was investigated in attempt to reveal the mechanisms involved in growth stimulation for growing probiotics in. Comparison of different transcripts next to each other revealed 162 and 63 significantly induced genes in late logarithmic phase and stationary phase, of which the expression was at least 3 fold up-regulated and down-regulated, respectively. Approximately, 38.4% of the up-regulated genes were associated with amino acid transport and metabolism notably for histidine and lysine biosynthesis, followed by genes/gene clusters involved in carbohydrate transport and metabolism, lipid transport and metabolism, and inorganic ion transport and metabolism. The analysis results suggest that the stimulatory effect of soymilk-based ecosystem on the L. casei Zhang growth is more complex than amino acids or oligopeptides supply.

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Transcriptome analysis of probiotic Lactobacillus casei Zhang during fermentation in soymilk

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Gene expression profile of Lactobacillus casei Zhang in fermented milk during transit in simulated gastrointestinal tract

Project description:The survival of probiotics could be strongly enhanced by delivery vehicles, but the mechanism was unknown. In this study, whole genome microarray technology was used to detect the gene expression profiles of probiotic Lactobacillus casei Zhang in the absence and presence of fermented milk in simulated gastrointestinal tract. The results showed the gene expression profiles were significantly different under these two different conditions. The change of the gene expression profile may be helpful to comprehend the role of delivery vehicles in enhancing the survival of probiotics. Twelve samples of bacterial cells in the absence and presence of fermented milk were collected at 3 h in simulated gastric juice, 4 h and 8 h in intestinal juice, 2 biological replicates were obtained in each time point. The average of the normalized expression values of the 2 biological replicates for each probe was regarded as the expression value of a predicted gene. To identify the expression pattern of each gene across different treatments, n-fold change ratios were calculated for every gene in pure L. casei Zhang versus L. casei Zhang in fermented milk.

2011-12-31 | E-GEOD-23685 | biostudies-arrayexpress

Gene expression profile of probiotic Lactobacillus casei Zhang during the late stage of milk fermentation

Project description:Lactobacillus casei Zhang is a probiotic bacterium isolated from koumiss in Inner Mongolia of China that has been commercially used as a starter in the manufacture of dairy products. To study the gene expression profiles of L. casei Zhang during growth in milk, a whole-genome microarray was used. Compared to L. casei Zhang grown to late logarithmic phase in milk, 61 genes were significantly up-regulated (>5 fold) in stationary phase, whereas 26 genes were down-regulated. Collectively, these data showed that the majority of the identified genes was involved in carbohydrate metabolism and energy production, followed by genes involved in nucleotide metabolism, inorganic ion transport, amino acid transport and metabolism, chaperone, etc. This study demonstrates the fundamental effects of cultural conditions on the transcriptome of L. casei Zhang. Moreover, it improves the understanding of the growth and survival mechanism of the bacterium during the late stage of milk fermentation.

2011-12-31 | GSE24597 | GEO

Gene expression profile of probiotic Lactobacillus casei Zhang during the late stage of milk fermentation

2011-12-31 | E-GEOD-24597 | biostudies-arrayexpress

Lacticaseibacillus casei str. Zhang

Project description:Transcriptome analysis of probiotic Lactobacillus casei Zhang during fermentation in soymilk

| PRJNA130969 | ENA

Integrative genomic and proteomic analysis of response of Lactobacillus casei str. Zhang to glucose limitation

Project description:Nutrient starvation is an important survival challenge for bacteria during industrial production of functional foods. Lactobacilli are increasingly being used as probiotics in functional foods. As next-generation sequencing technology has greatly advanced, we performed integrative proteomic and genomic analysis to investigate the response of Lactobacillus casei Zhang to a glucose-restricted environment. L. casei Zhang strains were permitted to evolve in glucose-limited or normal medium from a common ancestor over a 3-year period, and they were sampled after 1000, 2000, 3000, 4000, 5000, 6000, 7000, and 8000 generations and subjected to proteomic and genomic analyses. Genomic resequencing data revealed different point mutations and other mutational events in each generation of L. casei Zhang under glucose limitation stress. The proteins expressed differentially under glucose limitation were found to be significantly related to fructose and mannose metabolism, carbohydrate metabolic processes, lyase activity, and amino acid-transporting ATPase activity. The integrative proteomic and genomic analysis revealed that the mutations protected L. casei Zhang against glucose starvation by regulating other cellular carbohydrate, fatty acid, and amino acid catabolism; phosphoenolpyruvate system pathway activation; glycogen synthesis; ATP consumption; pyruvate metabolism; and general stress response protein expression. The results help reveal the mechanisms of adapting to glucose starvation and provide new strategies for enhancing the industrial utility of L. casei Zhang.

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Comparison of purified membrane vesicles from L. casei submitted or not to density gradient ultracentrifugation

Project description:Probiotics are defined by the World Health Organization as “live microorganisms which, when administered in adequate amounts confer a health benefit on the host”. A large number of probiotic bacteria used in the food industry are members of the diverse Lactobacillaceae family and are “Generally Regarded as Safe” (GRAS). Here, we aimed at characterizing the proteome of membrane vesicles (MVs) from Lacticasibacillus casei. We notably analyzed the proteomes of vesicles purified by density gradient ultracentrifugation (pMVs) or not (MVs).

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