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ABSTRACT:
PROVIDER: PRJNA691718 | ENA |
REPOSITORIES: ENA
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Project description:Pu-erh tea has attracted increasing attention worldwide because of its special flavor and health effects, but its impact on composition and function of the gut microbiota remains unclear. The aim of this study was to investigate effects of aqueous extracts of fermented (ripe) and non-fermented (raw) Pu-erh teas on the composition and function of intestinal microbiota of rats with diet-induced obesity. We conducted a comparative metagenomic and metaproteomic investigation of the microbial communities in cecal samples taken from obese rats administrated with or without extracts of raw and ripe Pu-erh tea. By analyzing the composition and diversity of 16S rRNA amplicons and expression profiles of 814 distinct proteins, we found that, despite differences in the chemical compositions of the raw and ripe Pu-erh tea, administration of either at two different doses (0.15 and 0.40 g/Kg body weight), significantly (P<0.05) increased community diversity, and changed the composition of the cecal microbiota by increasing the relative abundances of Firmicutes and decreasing those of Bacteroidetes. Community metabolic processes including sucrose metabolism, glycolysis, syntheses of proteins, rRNA and antibiotics were significantly (P<0.05), or had a tendency (0.10<P<0.05) to be, promoted by enriching relevant enzymes. Furthermore, evidences from population, molecular and metabolic levels have shown that polyphenols of raw Pu-erh tea and their metabolites can promote potentially the growth of Akkermansia municiphila by stimulating the type II and III secretion system protein, elongation factor Tu, and glyceraldehyde-3-phosphate dehydrogenase. This study has provided new evidences for the prebiotic effects of Pu-erh tea.
2022-03-03 | PXD010972 | Pride
Project description:Pu-erh tea displays cholesterol-lowering properties, but the underlying mechanism has not been elucidated. Theabrownin is one of the most active and abundant pigments in Pu-erh tea. Here, we show that theabrownin alters the gut microbiota in mice and humans, predominantly suppressing microbes associated with bile-salt hydrolase (BSH) activity. Theabrownin increases the levels of ileal conjugated bile acids (BAs) which, in turn, inhibit the intestinal FXR-FGF15 signaling pathway, resulting in increased hepatic production and fecal excretion of BAs, reduced hepatic cholesterol, and decreased lipogenesis. The inhibition of intestinal FXR-FGF15 signaling is accompanied by increased gene expression of enzymes in the alternative BA synthetic pathway, production of hepatic chenodeoxycholic acid, activation of hepatic FXR, and hepatic lipolysis. Our results shed light into the mechanisms behind the cholesterol- and lipid-lowering effects of Pu-erh tea, and suggest that decreased intestinal BSH microbes and/or decreased FXR-FGF15 signaling may be potential anti-hypercholesterolemia and anti-hyperlipidemia therapies.
2021-11-18 | MTBLS1259 | MetaboLights
Project description:Pu-erh tea microbiota Raw sequence reads
| PRJNA433075 | ENA
Project description:Fermenting pu-erh tea leaves Targeted Locus (Loci)
| PRJNA262706 | ENA
Project description:Aspergillus were believed the dominant fungi in Post-fermentation Pu-erh tea (Pu-erh Shucha, PFPT), a well-known traditional Chinese tea with multiple healthful benefits. However, the functions of Aspergillus in PFPT fermentation lack deeply investigated. In this work, A. niger, A. tamarii and A. fumigatus were fermented on sun-dried green tea leaves, and these samples (marked as Asn, Ast and Asf) were analyzed by integration of proteomics and metabolomics methods. We identified 2035, 2210 and 1095 Unique proteins in Asn, Asf and Ast, and assigned majority of identified proteins to cellular process and metabolic process in GeneOntology (GO) analysis. Majority KEGG pathways enriched significantly belonged to Metabolism. Through dbCAN annotation, 232, 205 and 226 proteins were annotated to 103, 86 and 97 families or subfamilies of Carbohydrate-active enzymes (CAZymes) in Asn, Asf and Ast, respectively. CAZymes involved in degradation of cellulose, starch, lignin, pectin, xylan and xyloglucan were identified, such as endoglucanases, glucosidase, cellulase. We further identified enzymes hypothesized to hydrolysis, oxidization, polymerization, conversion, biosynthesis and degradation of polyphenols or benzenoids. Together, we found that Aspergillus. spp produced enzymes in tea leaves, which involved in the degradation of plant polysaccharides and metabolism of tea polyphenols.
2019-10-13 | PXD015798 | iProX
Project description:A Predominant Microorganism Isolated from Ripe Pu-Erh tea that has the Ability to Convert Tea Polyphenols into Theabrownins
| PRJNA730104 | ENA
Project description:Microbial fermentation is involved in the processing of a dark tea popular for centuries in Northwest China which has shown many health benefits. This study will examine anti-obesity, hyperlipidemic and hyperglycemic effects of CGMCC No.8730 Eurotium cristatum (EC) fermented dark tea (8730DT).
2019-07-14 | GSE84496 | GEO