Project description:Whole genome transcriptional profiling was used to characterize the response of Lactobacillus plantarum WCFS1 human isolate during challenge with oleuropein. Twelve independent experiments were performed and mixed at random in groups of four for total of three RNA samples. The transcriptional profile shows that Lactobacillus plantarum WCFS1 adapts its metabolic capacity to acquire certain carbohydrates and repress the expression of genes involved in fatty acid biosyntheis. The transcriptomic datasets also revealed the downregulation of genes related to the biosynthesis of capsular polysaccharides and genes coding for ABC-type transporters. In addition, induction of oligopeptide permeases is also part of the response of Lactobacillus plantarum WCFS1 to oleuropein.
Project description:Lactobacillus plantarum was grown anaerobically on 4 different sugars (Mannose Lactose Fructose and Sucrose) to OD600 = 1.0. Samples were compared with a similar grown culture on glucose. An independnet biological duplicate of tht experimnet was performed (samples 1 and 2).
Project description:Lactobacillus plantarum is a common inhabitant of mammalian gastrointestinal tracts and specific strains belonging to this species are marketed as probiotics intended to confer beneficial health effects. To assist in determining the physiological status and host-microbe interactions of L. plantarum in the digestive tract we assessed changes in the transcriptome of L. plantarum WCFS1 during colonization of the cecum of germ-free mice. According to the transcript profiles L. plantarum WCFS1 was metabolically active and not under severe stress in this intestinal compartment. Carbohydrate metabolism was the most strongly affected functional gene category whereby many genes encoding diverse sugar transport and degradation pathways were induced in mice even compared to L. plantarum grown in a mouse chow-derived laboratory medium. This suggests that the ability of L. plantarum WCFS1 to consume diverse energy sources including plant-associated and host-derived carbohydrates was increased during its residence in the digestive tract. Many of these genes were also induced in L. plantarum colonizing germ-free mice fed a humanized Western-style diet. Similarly a core set of genes encoding cell surface-related properties were differentially expressed in mice. This set includes genes required for the D-alanylation and glycosylation of lipoteichoic acids that were strongly down-regulated in mice. In total L. plantarum exhibits a distinct in vivo transcriptome directed towards adaptation to the mouse intestinal environment. Keywords: cell type comparison
Project description:Lactobacillus plantarum was grown anaerobically on 4 different sugars (Mannose Lactose Fructose and Sucrose) to OD600 = 1.0. Samples were compared with a similar grown culture on glucose. An independnet biological duplicate of tht experimnet was performed (samples 1 and 2). L. plantarum WCFS1 grown in glucose, mannose, fructose, and sucrose
Project description:The indigenous human gut microbiota is a major contributor to the human superorganism with established roles in modulating nutritional status, immunity, and systemic health including diabetes and obesity. The complexity of the gut microbiota consisting of over 1012 residents and approximately 1000 species has thus far eluded systematic analyses of the precise effects of individual microbial residents on human health. In contrast, health benefits have been shown upon ingestion of certain so-called probiotic Lactobacillus strains in food products and nutritional supplements, thereby providing a unique opportunity to study the global responses of a gut-adapted microorganism in the human gut and to identify the molecular mechanisms underlying microbial modulation of intestinal physiology, which might involve alterations in the intestinal physico-chemical environment, modifications in the gut microbiota, and/or direct interaction with mucosal epithelia and immune cells. Here we show by transcriptome analysis using DNA microarrays that the established probiotic bacterium, L. plantarum 299v, adapts its metabolic capacity in the human digestive tract for carbohydrate acquisition and expression of exo-polysaccharide and proteinaceous cell surface compounds. This report constitutes the first application of global gene expression profiling of a gut-adapted commensal microorganism in the human gut. Comparisons of the transcript profiles to those obtained for L. plantarum WCFS1 in germ-free mice revealed conserved L. plantarum responses indicative of a core transcriptome expressed in the mammalian gut and provide new molecular targets for determining microbial-host interactions affecting human health. Hybridization of the samples against a common reference of gDNA isolated from L. plantarum 299v