Obesity is a complex disease that increases the risk of other pathologies. Its prevention and long-term weight loss maintenance are problematic. Gut microbiome is considered a potential obesity modulator. The objective of the present study was to summarize recent findings regarding the relationships between obesity, gut microbiota, and diet (vegetable/animal proteins, high-fat diets, restriction of carbohydrates), with an emphasis on dietary fiber and resistant starch. The composition of the human gut microbiome and the methods of its quantification are described. Products of the gut microbiome metabolism, such as short-chain fatty acids and secondary bile acids, and their effects on the gut microbiota, intestinal barrier function and immune homeostasis are discussed in the context of obesity. The importance of dietary fiber and resistant starch is emphasized as far as effects of the host diet on the composition and function of the gut microbiome are concerned. The complex relationships between human gut microbiome and obesity are finally summarized.

• Klíčová slova
• butyrate, dietary fiber, immune homeostasis, intestinal barrier function, resistant starch, secondary bile acids, short-chain fatty acids,
• MeSH
• dieta s vysokým obsahem tuků škodlivé účinky   MeSH
• dieta * MeSH
• kyseliny mastné těkavé metabolismus   MeSH
• lidé MeSH
• obezita * mikrobiologie   MeSH
• potravní vláknina * aplikace a dávkování   MeSH
• střevní mikroflóra * fyziologie   MeSH
• žlučové kyseliny a soli metabolismus   MeSH
• Check Tag
• lidé MeSH
• Publikační typ
• časopisecké články MeSH
• přehledy MeSH
• Názvy látek
• kyseliny mastné těkavé MeSH
• potravní vláknina * MeSH
• žlučové kyseliny a soli MeSH

Butyrate is formed in the gut during bacterial fermentation of dietary fiber and is attributed numerous beneficial effects on the host metabolism. We aimed to develop a method for the assessment of functional capacity of gut microbiota butyrate synthesis based on the qPCR quantification of bacterial gene coding butyryl-CoA:acetate CoA-transferase, the key enzyme of butyrate synthesis. In silico, we identified bacteria possessing but gene among human gut microbiota by searching but coding sequences in available databases. We designed and validated six sets of degenerate primers covering all selected bacteria, based on their phylogenetic nearness and sequence similarity, and developed a method for gene abundance normalization in human fecal DNA. We determined but gene abundance in fecal DNA of subjects with opposing dietary patterns and metabolic phenotypes-lean vegans (VG) and healthy obese omnivores (OB) with known fecal microbiota and metabolome composition. We found higher but gene copy number in VG compared with OB, in line with higher fecal butyrate content in VG group. We further found a positive correlation between the relative abundance of target bacterial genera identified by next-generation sequencing and groups of but gene-containing bacteria determined by specific primers. In conclusion, this approach represents a simple and feasible tool for estimation of microbial functional capacity.

• Klíčová slova
• butyrate, functional capacity, gut microbiota,
• MeSH
• bakteriální geny * MeSH
• butyráty metabolismus   MeSH
• DNA bakterií genetika   MeSH
• dospělí MeSH
• feces mikrobiologie   MeSH
• fenotyp MeSH
• fylogeneze MeSH
• genová dávka MeSH
• lidé středního věku MeSH
• lidé MeSH
• mladiství MeSH
• mladý dospělý MeSH
• neparametrická statistika MeSH
• obezita mikrobiologie   MeSH
• polymerázová řetězová reakce * MeSH
• reprodukovatelnost výsledků MeSH
• střevní mikroflóra genetika   MeSH
• vegani MeSH
• Check Tag
• dospělí MeSH
• lidé středního věku MeSH
• lidé MeSH
• mladiství MeSH
• mladý dospělý MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH
• Názvy látek
• butyráty MeSH
• DNA bakterií MeSH

Postbiotics are health-promoting microbial metabolites delivered as a functional food or a food supplement. They either directly influence signaling pathways of the body or indirectly manipulate metabolism and the composition of intestinal microflora. Cancer is the second leading cause of death worldwide and even though the prognosis of patients is improving, it is still poor in the substantial part of the cases. The preventable nature of cancer and the importance of a complex multi-level approach in anticancer therapy motivate the search for novel avenues of establishing the anticancer environment in the human body. This review summarizes the principal findings demonstrating the usefulness of both natural and synthetic sources of postbotics in the prevention and therapy of cancer. Specifically, the effects of crude cell-free supernatants, the short-chain fatty acid butyrate, lactic acid, hydrogen sulfide, and β-glucans are described. Contradictory roles of postbiotics in healthy and tumor tissues are highlighted. In conclusion, the application of postbiotics is an efficient complementary strategy to combat cancer.

• Klíčová slova
• GPR81, SCFA, colorectal cancer, functional food, intestinal metabolome, microbiome,
• MeSH
• beta-glukany farmakologie   MeSH
• butyráty farmakologie   MeSH
• kyselina mléčná farmakologie   MeSH
• kyseliny mastné těkavé metabolismus   farmakologie   MeSH
• lidé MeSH
• metabolom MeSH
• nádory dietoterapie   metabolismus   MeSH
• potravní doplňky mikrobiologie   MeSH
• prebiotika mikrobiologie   MeSH
• probiotika metabolismus   farmakologie   MeSH
• střevní mikroflóra účinky léků   MeSH
• sulfan farmakologie   MeSH
• Check Tag
• lidé MeSH
• Publikační typ
• časopisecké články MeSH
• přehledy MeSH
• Názvy látek
• beta-glukany MeSH
• butyráty MeSH
• kyselina mléčná MeSH
• kyseliny mastné těkavé MeSH
• prebiotika MeSH
• sulfan MeSH

Bisphenol S (BPS) is an industrial chemical used in the process of polymerization of polycarbonate plastics and epoxy resins and thus can be found in various plastic products and thermal papers. The microbiota disrupting effect of BPS on the community structure of the microbiome has already been reported, but little is known on how BPS affects bacterial activity and function. To analyze these effects, we cultivated the simplified human intestinal microbiota (SIHUMIx) in bioreactors at a concentration of 45 µM BPS. By determining biomass, growth of SIHUMIx was followed but no differences during BPS exposure were observed. To validate if the membrane composition was affected, fatty acid methyl esters (FAMEs) profiles were compared. Changes in the individual membrane fatty acid composition could not been described; however, the saturation level of the membranes slightly increased during BPS exposure. By applying targeted metabolomics to quantify short-chain fatty acids (SCFA), it was shown that the activity of SIHUMIx was unaffected. Metaproteomics revealed temporal effect on the community structure and function, showing that BPS has minor effects on the structure or functionality of SIHUMIx.

• Klíčová slova
• bisphenol S, fatty acid methyl ester, in vitro model, intestinal microbiota, metaproteomics, short-chain fatty acids,
• Publikační typ
• časopisecké články MeSH

PURPOSE: Although beneficial effects of the dietary n-3 docosahexaenoic acid (DHA) or butyrate in colon carcinogenesis have been implicated, the mechanisms of their action are not fully clear. Here, we investigated modulations of composition of individual phospholipid (PL) classes, with a particular emphasis on cardiolipins (CLs), in colon cells treated with DHA, sodium butyrate (NaBt), or their combination (DHA/NaBt), and we evaluated possible associations between lipid changes and cell fate after fatty acid treatment. METHODS: In two distinct human colon cell models, foetal colon (FHC) and adenocarcinoma (HCT-116) cells, we compared patterns and composition of individual PL classes following the fatty acid treatment by HPLC-MS/MS. In parallel, we measured the parameters reflecting cell proliferation, differentiation and death. RESULTS: In FHC cells, NaBt induced primarily differentiation, while co-treatment with DHA shifted their response towards cell death. In contrast, NaBt induced apoptosis in HCT-116 cells, which was not further affected by DHA. DHA was incorporated in all main PL types, increasing their unsaturation, while NaBt did not additionally modulate these effects in either cell model. Nevertheless, we identified an unusually wide range of CL species to be highly increased by NaBt and particularly by DHA/NaBt, and these effects were more pronounced in HCT-116 cells. DHA and DHA/NaBt enhanced levels of high molecular weight and more unsaturated CL species, containing DHA, which was specific for either differentiation or apoptotic responses. CONCLUSIONS: We identified a wide range of CL species in the colon cells which composition was significantly modified after DHA and NaBt treatment. These specific CL modulations might contribute to distinct cellular differentiation or apoptotic responses.

• Klíčová slova
• Apoptosis, Butyrate, Cardiolipins, Colon cancer, Docosahexaenoic acid, Phospholipids,
• MeSH
• apoptóza účinky léků   MeSH
• buněčná diferenciace účinky léků   MeSH
• fosfolipidy chemie   MeSH
• HCT116 buňky MeSH
• kaspasa 3 genetika   metabolismus   MeSH
• kolon cytologie   účinky léků   MeSH
• kyselina máselná farmakologie   MeSH
• kyseliny dokosahexaenové farmakologie   MeSH
• lidé MeSH
• nádorové buněčné linie MeSH
• proliferace buněk účinky léků   MeSH
• tandemová hmotnostní spektrometrie MeSH
• Check Tag
• lidé MeSH
• Publikační typ
• časopisecké články MeSH
• Názvy látek
• CASP3 protein, human MeSH Prohlížeč
• fosfolipidy MeSH
• kaspasa 3 MeSH
• kyselina máselná MeSH
• kyseliny dokosahexaenové MeSH

A decrease in the abundance and biodiversity of intestinal bacteria within the Firmicutes phylum has been associated with inflammatory bowel disease (IBD). In particular, the anti-inflammatory bacterium Faecalibacterium prausnitzii, member of the Firmicutes phylum and one of the most abundant species in healthy human colon, is underrepresented in the microbiota of IBD patients. The aim of this study was to investigate the immunomodulatory properties of F. prausnitzii strain A2-165, the biofilm forming strain HTF-F and the extracellular polymeric matrix (EPM) isolated from strain HTF-F. For this purpose, the immunomodulatory properties of the F. prausnitzii strains and the EPM were studied in vitro using human monocyte-derived dendritic cells. Then, the capacity of the F. prausnitzii strains and the EPM of HTF-F to suppress inflammation was assessed in vivo in the mouse dextran sodium sulphate (DSS) colitis model. The F. prausnitzii strains and the EPM had anti-inflammatory effects on the clinical parameters measured in the DSS model but with different efficacy. The immunomodulatory effects of the EPM were mediated through the TLR2-dependent modulation of IL-12 and IL-10 cytokine production in antigen presenting cells, suggesting that it contributes to the anti-inflammatory potency of F. prausnitzii HTF-F. The results show that F. prausnitzii HTF-F and its EPM may have a therapeutic use in IBD.

• MeSH
• antigeny povrchové metabolismus   MeSH
• cytokiny genetika   metabolismus   MeSH
• dendritické buňky imunologie   metabolismus   MeSH
• extracelulární matrix metabolismus   MeSH
• fenotyp MeSH
• forkhead transkripční faktory genetika   metabolismus   MeSH
• genetická transkripce MeSH
• idiopatické střevní záněty etiologie   metabolismus   patologie   MeSH
• kolitida chemicky indukované   genetika   imunologie   metabolismus   mikrobiologie   MeSH
• lymfatické uzliny imunologie   metabolismus   MeSH
• mediátory zánětu metabolismus   MeSH
• modely nemocí na zvířatech MeSH
• myši MeSH
• Ruminococcus metabolismus   ultrastruktura   MeSH
• síran dextranu škodlivé účinky   MeSH
• slezina imunologie   metabolismus   MeSH
• střevní sliznice metabolismus   mikrobiologie   patologie   MeSH
• toll-like receptor 2 genetika   metabolismus   MeSH
• zvířata MeSH
• Check Tag
• myši MeSH
• ženské pohlaví MeSH
• zvířata MeSH
• Publikační typ
• časopisecké články MeSH
• Názvy látek
• antigeny povrchové MeSH
• cytokiny MeSH
• forkhead transkripční faktory MeSH
• FOXP3 protein, human MeSH Prohlížeč
• mediátory zánětu MeSH
• síran dextranu MeSH
• toll-like receptor 2 MeSH

Intestinal homeostasis is precisely regulated by a number of endogenous regulatory molecules but significantly influenced by dietary compounds. Malfunction of this system may result in chronic inflammation and cancer. Dietary essential n-3 polyunsaturated fatty acids (PUFAs) and short-chain fatty acid butyrate produced from fibre display anti-inflammatory and anticancer activities. Both compounds were shown to modulate the production and activities of TNF family cytokines. Cytokines from the TNF family (TNF- α, TRAIL, and FasL) have potent inflammatory activities and can also regulate apoptosis, which plays an important role in cancer development. The results of our own research showed enhancement of apoptosis in colon cancer cells by a combination of either docosahexaenoic acid (DHA) or butyrate with TNF family cytokines, especially by promotion of the mitochondrial apoptotic pathway and modulation of NF κ B activity. This review is focused mainly on the interaction of dietary PUFAs and butyrate with these cytokines during colon inflammation and cancer development. We summarised recent knowledge about the cellular and molecular mechanisms involved in such effects and outcomes for intestinal cell behaviour and pathologies. Finally, the possible application for the prevention and therapy of colon inflammation and cancer is also outlined.

• MeSH
• apoptóza MeSH
• butyráty metabolismus   MeSH
• cytokiny metabolismus   MeSH
• dieta MeSH
• kolon patologie   MeSH
• kyseliny dokosahexaenové metabolismus   MeSH
• lidé MeSH
• mitochondrie patologie   MeSH
• myši MeSH
• nádory metabolismus   MeSH
• nenasycené mastné kyseliny metabolismus   MeSH
• NF-kappa B metabolismus   MeSH
• střevní sliznice metabolismus   MeSH
• tumor nekrotizující faktory metabolismus   MeSH
• zánět metabolismus   MeSH
• zvířata MeSH
• Check Tag
• lidé MeSH
• myši MeSH
• zvířata MeSH
• Publikační typ
• časopisecké články MeSH
• přehledy MeSH
• Názvy látek
• butyráty MeSH
• cytokiny MeSH
• kyseliny dokosahexaenové MeSH
• nenasycené mastné kyseliny MeSH
• NF-kappa B MeSH
• tumor nekrotizující faktory MeSH

One of the promising approaches in the therapy of ulcerative colitis is administration of butyrate, an energy source for colonocytes, into the lumen of the colon. This study investigates the effect of butyrate producing bacterium Clostridium tyrobutyricum on dextran sodium sulphate (DSS)-induced colitis in mice. Immunocompetent BALB/c and immunodeficient severe combined immunodeficiency (SCID) mice reared in specific-pathogen-free (SPF) conditions were treated intrarectally with C. tyrobutyricum 1 week prior to the induction of DSS colitis and during oral DSS treatment. Administration of DSS without C. tyrobutyricum treatment led to an appearance of clinical symptoms - bleeding, rectal prolapses and colitis-induced increase in the antigen CD11b, a marker of infiltrating inflammatory cells in the lamina propria. The severity of colitis was similar in BALB/c and SCID mice as judged by the histological damage score and colon shortening after 7 days of DSS treatment. Both strains of mice also showed a similar reduction in tight junction (TJ) protein zonula occludens (ZO)-1 expression and of MUC-2 mucin depression. Highly elevated levels of cytokine tumour necrosis factor (TNF)-α in the colon of SCID mice and of interleukin (IL)-18 in BALB/c mice were observed. Intrarectal administration of C. tyrobutyricum prevented appearance of clinical symptoms of DSS-colitis, restored normal MUC-2 production, unaltered expression of TJ protein ZO-1 and decreased levels of TNF-α and IL-18 in the descending colon of SCID and BALB/c mice, respectively. Some of these features can be ascribed to the increased production of butyrate in the lumen of the colon and its role in protection of barrier functions and regulation of IL-18 expression.

• MeSH
• akutní nemoc MeSH
• antigeny CD11b biosyntéza   genetika   MeSH
• aplikace rektální MeSH
• bakteriální translokace MeSH
• butyráty metabolismus   MeSH
• Clostridium tyrobutyricum fyziologie   MeSH
• fosfoproteiny biosyntéza   genetika   MeSH
• imunokompetence MeSH
• interleukin-18 biosyntéza   genetika   MeSH
• kolon metabolismus   mikrobiologie   patologie   MeSH
• mastné kyseliny metabolismus   MeSH
• membránové proteiny biosyntéza   genetika   MeSH
• mucin 2 biosyntéza   genetika   MeSH
• muciny biosyntéza   MeSH
• myši inbrední BALB C MeSH
• myši SCID MeSH
• myši MeSH
• organismy bez specifických patogenů MeSH
• probiotika terapeutické užití   MeSH
• protein zonula occludens 1 MeSH
• síran dextranu toxicita   MeSH
• těžká kombinovaná imunodeficience genetika   imunologie   MeSH
• TNF-alfa biosyntéza   genetika   MeSH
• ulcerózní kolitida chemicky indukované   genetika   imunologie   mikrobiologie   patologie   MeSH
• zvířata MeSH
• Check Tag
• myši MeSH
• zvířata MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH
• Názvy látek
• antigeny CD11b MeSH
• butyráty MeSH
• fosfoproteiny MeSH
• interleukin-18 MeSH
• mastné kyseliny MeSH
• membránové proteiny MeSH
• Muc2 protein, mouse MeSH Prohlížeč
• mucin 2 MeSH
• muciny MeSH
• protein zonula occludens 1 MeSH
• síran dextranu MeSH
• Tjp1 protein, mouse MeSH Prohlížeč
• TNF-alfa MeSH