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.
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.
Project description:We performed the long-term administration experiment using a yogurt fermented with Lactobacillus delbrueckii subsp. bulgaricus 2038 and Streptococcus thermophilus 1131 (LB81 yogurt) for 20 months in order to understand the effects of the long-term intake of probiotics on mice. Microarrays were used to compare the gene expressions of the intestine, liver and spleen tissues between control mice and LB81 yogurt-intake mice at 28 months of age. Abbreviations used: A, LB81 yogurt-intake mice; C, control mice
Project description:Obesity and overweight are closely related to diet, and gut microbiota play an important role in body weight and human health. The aim of this study was to explore how Lactobacillus curvatus HY7601 and Lactobacillus plantarum KY1032 supplementation alleviate obesity by modulating the human gut microbiome. A randomized, double-blind, placebo-controlled study was conducted on 72 overweight individuals. Over a 12-week period, probiotic groups consumed 5×10^9 colony-forming units of HY7601 and KY1032), whereas the placebo group consumed the same product without probiotics. After treatment, the probiotic group displayed a reduction in body weight (p <0.001), visceral fat mass (p <0.025), and waist circumference (p <0.007), and an increase in adiponectin (p <0.046), compared with the placebo group. Additionally, HY7601 and KY1032 supplementation modulated bacterial gut microbiota characteristics and beta diversity by increasing Bifidobacteriaceae and Akkermansiaceae, and decreasing Prevotellaceae and Selenomonadaceae. In summary, HY7601 and KY1032 probiotics exert anti-obesity effects by regulating the gut microbiota; hence, they have therapeutic potential for preventing or alleviating obesity and overweight.
Project description:Probiotics have shown promise in positively altering gut microbiota and can potentially improve the gut flora of individuals with obesity. Recently, the development of probiotics with “Pharmabiotic” properties, which can reduce body fat and inhibit lipid accumulation, has emerged as a notable approach for effectively combating obesity. Nevertheless, owing to the lack of a universal methodology for elucidating the molecular mechanisms of probiotics, their antiobesity effects remain largely unknown. Herein, we developed an advanced multiomics-based strategy to decipher the mechanisms by which probiotics and their derivatives curtail adipocyte lipid production to affirm their antiobesity potential. Our initial investigation assessed the impact of probiotics and their derivatives on adipocyte differentiation and lipid generation at defined differentiation stages. Leveraging these insights, we performed comprehensive multiomics analyses at selected intervals to deepen our understanding regarding the suppression mechanisms of lipid formation. This framework confirmed the antiobesity efficacy of Lactobacillus reuteri lysate, targeting early differentiation to impede branched-chain amino acid (BCAA) catabolism and reduce adipocyte lipid accumulation. Specifically, L. reuteri lysate suppressed Krüppel-like factor 5 expression in early adipocyte differentiation phases, downregulating peroxisome proliferator–activated receptor gamma expression and reducing BCAA catabolism. Concurrently, L. reuteri lysate enhanced hypoxia-inducible factor 1 alpha expression, consequently downregulating lipin-1 expression in initial adipocyte differentiation stages, thus inhibiting adipogenesis. This study underscores the efficacy of our strategy in elucidating the intricate causal dynamics between host and microbiome, advancing therapeutic development and target exploration of probiotics.
Project description:Analysis of differentiated Caco-2 intestinal epithelial cell line cocultured with probiotics L. acidophilus NCFM™, B. lactis 420, L. salivarius Ls-33 bacterial cells or treated with cell-free supernatant, and with E. coli O157:H7 cell-free supernatant. Lactobacillus and Bifidobacterium are important genera suggested to be beneficial for human health and E. coli O157:H7 is a pathogen causing hemorrhagic colitis and hemolytic uremic syndrome. Results provide insight into the mechanisms underlying the beneficial effects of probiotics on intestinal epithelial cells and a comparison to pathogenic E. coli.
Project description:Probiotics may alter stress sensitivity by modulating the gut-brain axis. The heat-inactivated, enteric-colonizing Lactobacillus gasseri, CP2305 (paraprobiotic CP2305), has been shown to ameliorate psychological stress-related symptoms. This study was designed to reveal the beneficial effects of paraprobiotic CP2305 on top athletes experiencing physical and mental stresses.