內(nèi)容: The interaction mechanism between soyasaponin (Ssa) and bitter receptors/mucin, as well as the saliva interface behavior of Ssa, were investigated to explore the presentation mechanism of Ssa bitterness and astringency (BA). Strong bitterness arising from high Ssa concentrations (0.5–1.5 mg/mL) had a masking effect on astringency. At Ssa concentrations of 1.0–1.5 mg/mL, Ssa micelles altered the structure of mucin, exposing its internal tryptophan to a more polar environment. At Ssa concentrations of 0.05–1.50 mg/mL, its reaction with mucin increased the aggregation of particles in artificial saliva, which reduced the frictional lubricating properties of oral saliva. Ssa-mucin interactions affected the salivary interfacial adsorption layer, and their complexes synergistically reduced the interfacial tension. Ssa monomers and soyasapogenols bind to bitter receptors/mucin via hydrogen bonding and hydrophobic interactions. Class A Ssa binds more strongly than class B Ssa, and thus likely presents a higher BA. In conclusion, Ssa interacts with bitter receptors/mucin causing conformational changes and aggregation of salivary mucin, resulting in diminished frictional lubricating properties of oral saliva. This, in turn, affects taste perception and gustatory transmission.

內(nèi)容: Ergothioneine is a natural amino acid with powerful antioxidant activity. Previous studies have demonstrated that ergothioneine can increase the lifespan of Drosophila melanogaster and Caenorhabditis elegans, and enhance telomerase activity. In present study, the metagenomics sequencing and quantitative real-time polymerase chain reaction analysis were employed to characterize the composition and diversity of gut microbiome in aging flies. And the alterations in the gut barrier, gut morphology, and other gut physiological indicators of aging flies were evaluated. Here, the results showed that ergothioneine induced little variations in gut microbiota composition in flies at mid-life, and significant alterations in the gut microbiota populations were only observed in flies at late-life. And ergothioneine attenuated age-related gut injuries, including decreasing reactive oxygen species levels in intestinal enterocytes, reduction of intestinal cells death, and preservation of gut integrity in aging flies. Ergothioneine also improved the gut morphology by preserving the structure and shape of cell organelles and inducing the intestinal autophagy. And activation of intestinal autophagy also contributed to the longevity effect mediated by ergothioneine in an unidentified mechanism.

內(nèi)容: This study aimed to evaluate the effects of Bifidobacterium breve CCFM683 on psoriasis and to investigate the underlying mechanisms. B. breve CCFM683 significantly ameliorated psoriasis in mice as well as elevated the deoxycholic acid (DCA) and lithocholic acid (LCA) in the colon compared with those of the imiquimod (IMQ)-treated mice. Meanwhile, B. breve CCFM683 increased the relative abundance of DCA-producing Lachnoclostridium and diminished the harmful Desulfovibrio and Prevotellaceae UCG001. Additionally, the farnesoid X receptor (FXR) in the skin was activated and the expression of the Toll-like receptor 4 (TLR4)/nuclear factor kappa-B (NF-κB) pathway was inhibited, and the downstream interleukin (IL)-17 and tumor necrosis factor (TNF)-α were downregulated whereas IL-10 was up-regulated. Moreover, the subsequent hyperproliferation of keratinocytes and the dysfunction of the epidermal barrier were improved. In conclusion, CCFM683 administration ameliorated IMQ-induced psoriasis via modulating gut microbiota, promoting the DCA production, regulating the FXR-TLR4/NF-κB pathway, diminishing proinflammatory cytokines, and regulating keratinocytes and epidermal barrier. These findings may be conducive to elucidating the mechanism for probiotics to ameliorate psoriasis and to promote its clinical trials in skin disease.

內(nèi)容: Quality deterioration induced by microbial community in Litopenaeus vannamei during superchilling storage were demonstrated in this study. In this study, 6 microorganisms were identified as the biomarkers by 16S rDNA sequencing and 71 differential metabolites were identified by untargeted metabolomics. The correlation analysis between microorganisms and differential metabolites revealed that Oceanicaulis, Aliihoeflea, Prauserella, Chelativorans and Pseudoalteromonas had the potential to be the important microorganisms of deterioration of superchilled shrimp. Moreover, the spearman correlation analysis revealed that lightness value had highly significant correlation with Shewanella (P < 0.01), and thiobarbituric acid content, total viable count value, total sulfhydryl content, trichloroacetic acid-soluble peptide and Ca2+-ATPase activity showed significantly correlation with Oceanicaulis, Prauserella, Chelativorans, Aliihoeflea and Pseudoalteromonas (P < 0.05). This study offers a better understanding for mechanisms behind quality degradation induced by microorganisms, which may help the quality maintaining of Pacific white shrimp during superchilling storage.

內(nèi)容: Shanxi aged vinegar (SAV) is a famous cereal vinegar in China, which is produced through a solid-state fermentation where diverse microbes spontaneously and complex interactions occur. Here, combined with the metatranscriptomics, the microbial co-occurrence network was constructed, indicating that Lactobacillus, Acetobacter and Pediococcus are the most critical genera to maintain the fermentation stability. Based on an extensive collection of 264 relevant literatures, a transport network containing 2 271 reactions between microorganisms and compounds was constructed, showing that glucose (84% of all species), fructose (67%) and maltose (67%) are the most frequently utilized substrates while lactic acid (64%), acetic acid (45%) are the most frequently occurring metabolites. Specifically, the metabolic influence of species pairs was calculated using a mathematical calculation model and the metabolic influence network was constructed. The topology properties analysis found that Lactobacillus was the key role with robust metabolic control of vinegar fermentation ecosystem and acetic acid and lactic acid were the main metabolites with feedback regulation in microbial metabolism of SAV. Furthermore, systematic coordination of positive and negative impacts was proved to be inevitable to form flavor compounds and maintain a natural microbial ecosystem. This study provides a new perspective for understanding microbial interactions in fermented food.

內(nèi)容: This study aimed to explore the protective effect and potential mechanism of Nostoc commune Vauch. polysaccharide (NCVP) on lead (Pb)-poisoning mice. NCVP improved Pb-induced hepatorenal toxicity and inflammatory responses and modulated key indicators of antioxidant capacity. Moreover, the down-regulation of critical proteins of the Nrf2 pathway induced by Pb could be reversed after NCVP intervention. In addition, NCVP maintained the diversity of gut bacteriobiota and restored the relative abundance of f_Prevotellaceae, g_Alloprevotella, and f_Eubacterium_coprostanoligenes_group reduced by Pb. Also, NCVP regulated the diversity and abundance of gut mycobiota affected by Pb. Specifically, Pb decreased the proportion of pathogenic species (g_Fusarium, p_Basidiomycota, g_Alternaria, g_Aspergillus, and g_Candida) while NCVP increased the abundance of probiotics species (g_Kazachstania and p_Ascomycota). Furthermore, the metabolomic analysis found that NCVP significantly altered a range of microbial metabolites, including porphobilinogen, cromakalim, salidroside, and trichostatin A, which has significant associations with specific gut bacteriobiota or mycobiota. These altered metabolites are involved in primary bile acid biosynthesis, metabolism of xenobiotics by cytochrome P450, lysine degradation, and other metabolic pathways. Overall, our findings indicate that NCVP might be an excellent natural product for eliminating Pb-induced hepatorenal toxicity, possibly by regulating gut bacteriome, mycobiome and metabolome.

內(nèi)容: Higher alcohols are key factors affecting sensory quality and post-drinking comfort of alcoholic beverages. A strategy combining solid-phase extraction and gas chromatography-mass spectrometry (SPE-GC-MS) was established to analyze the metabolism pattern of higher alcohols in rat plasma after gavage of 4 common alcoholic beverages including huangjiu, baijiu, wine and brandy. 7 mL of dichloromethane was determined as the optimal extraction condition, and 8 higher alcohols were precisely quantified with detection limits of 1.82?11.65 μg/L, recoveries of 89.07%?110.89% and fine repeatability. The fastest absorption and elimination rates of plasma total higher alcohols were observed in baijiu and huangjiu group, respectively, and the highest peak concentration was found in brandy group. Additionally, the metabolic rate of plasma isoamyl alcohol in huangjiu group was faster than that in wine group at the same intragastric administration dosage. This study may provide potential insight for evaluation of alcoholic beverage quality.

內(nèi)容: Probiotics crosstalk immunity to improve host glycolipid metabolism, which is a new strategy for obesity. This study aimed to explore the functions of Lacticaseibacillus paracasei K56 (K56), in regulating the lipid metabolism of adipocytes and its immune regulation mechanisms. We co-cultured RAW264.7 macrophages with K56, and the K56-stimulated RAW264.7-conditioned medium (K56-CM) was collected and treated with 3T3-L1 pre-adipocytes. The expression of lipid metabolism-related markers of adipocytes, and the content of cytokines in CMs were detected. The results demonstrated that K56-CM promoted the expression of peroxisome proliferator-activated receptor-γ (PPAR-γ), CCAAT/enhancer binding protein α (C/EBPα), and other adipogenesis-related markers, which resulted in the upregulation of lipolysis markers, such as hormone-sensitive lipase (HSL), adipose triglyceride lipase (ATGL). The activation of lipolysis enhanced the expression of fatty acid β-oxidation-related and mitochondrial biogenesis-related markers and reduced lipid accumulation in adipocytes. The glycolipid metabolism pattern of K56 may be due to its immunomodulatory characteristics, which stimulated macrophages to secrete fewer TNF-α, thereby promoting the expression of lipolysis-related markers, and TNF-α synergized with lipase to promote lipolysis. It has not been reported that L. paracasei modulated lipid metabolism via the lipolysis pathway, which suggested that K56 may regulate glycolipid metabolism of the host by maintaining immune homeostasis.

內(nèi)容: Caffeine intake during pregnancy is common, while its effect on gut microbiota composition of offspring and the relationship with susceptibility to adult diseases remains unclear. This study aimed to confirm the effects of prenatal caffeine exposure (PCE) on the gut microbiota composition and its metabolites in female offspring rats, and to further elucidate its underlying mechanism and intervention targets in adult non-alcoholic fatty disease (NAFLD). The results showed that the gut microbiota of PCE female offspring at multiple time points from infancy to adolescence were significantly changed with depletion of butyric acid-producing bacteria, leading to a decrease in butyric acid in adulthood. It was also found that PCE female offspring rats were sensitive to NAFLD induced by a postnatal high-fat diet (HFD), which is mainly related to the enhancement of hepatic triglyceride synthesis function. Through mechanism exploration, we found that HFD further reduced the fecal and serum butyric acid levels in the PCE female offspring, which was significantly negatively correlated with hepatic SREBP-1c/FASN mRNA expression and triglyceride level. In vivo and in vitro experiments confirmed that sodium butyrate (NaB) supplementation could reduce hepatic lipid accumulation through MCT1/GPR109A-AMPK, thereby effectively decreasing the susceptibility to NAFLD in the PCE female offspring rats.

內(nèi)容: Nowadays, inflammatory bowel disease (IBD)-patient therapies are mainly based on corticosteroid, thiopurine, and immunomodulator treatments. Patients with active disease, that do not respond to corticosteroid and/or thiopurine treatment, can switch to the usage of the chimeric monoclonal antibody infliximab (IFX). However, to date, no treatment appeared to be conclusive in lowering the incidence of IBD relapses. With the aim to increase the effectiveness of IFX treatment, we combined it with an adjuvant purple corn supplementation enriched in anthocyanins. IBD-patients were enrolled before they underwent to the IFX-infusion, and they were allocated in 2 different study arms. Patients in the intervention-arm followed a dietary supplementation with purple corn water-soluble extract, whereas control patients had a daily consumption of red fruit tea. 16S rDNA gene-sequencing and high-resolution mass-spectrometry metabo-lipidomics analyses were conducted on stool and sera samples, respectively. As a result, the experimental intervention mainly affected the serum metabolome of IBD-patients by decreasing the concentration of specific lipids. Focusing on IBD patient annotated taxa, a significant decrease in Lactobacillus and Bifidobacterium relative abundances was found. As far as it concerns the ulcerative colitis patient subset, the experimental intervention led to a decrease in Alistipes and Erysipelotrichaceae UCG-003 genus abundances and a concomitant Parabacteroides increase. On the contrary, after treatment, Crohn’s disease patients did not exhibit metataxonomics differences at the genus level. At the end of the treatment that led to a reshaped microbiota community, the gathered data paves the way for the usage of a specifically designed probiotic supplementation as a valuable strategy for IBD-patients under IFX infusion.