Mice Microbiota Composition Changes by Inulin Feeding with a Long Fasting Period under a Two-Meals-Per-Day Schedule

Water-soluble dietary fiber is known to modulate fecal microbiota. Although there are a few reports investigating the effects of fiber intake timing on metabolism, there are none on the effect of intake timing on microbiota. Therefore, in this study, we examined the timing effects of inulin-containing food on fecal microbiota. Mice were housed under conditions with a two-meals-per-day schedule, with a long fasting period in the morning and a short fasting period in the evening. Then, 10–14 days after inulin intake, cecal content and feces were collected, and cecal pH and short-chain fatty acids (SCFAs) were measured. The microbiome was determined using 16S rDNA sequencing. Inulin feeding in the morning rather than the evening decreased the cecal pH, increased SCFAs, and changed the microbiome composition. These data suggest that inulin is more easily digested by fecal microbiota during the active period than the inactive period. Furthermore, to confirm the effect of fasting length, mice were housed under a one-meal-per-day schedule. When the duration of fasting was equal, the difference between morning and evening nearly disappeared. Thus, our study demonstrates that consuming inulin at breakfast, which is generally after a longer fasting period, has a greater effect on the microbiota.

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Domestication Shapes the Community Structure and Functional Metagenomic Content of the Yak Fecal Microbiota

Frontiers in Microbiology ◽

10.3389/fmicb.2021.594075 ◽

2021 ◽

Vol 12 ◽

Author(s):

Haibo Fu ◽

Liangzhi Zhang ◽

Chao Fan ◽

Chuanfa Liu ◽

Wenjing Li ◽

...

Keyword(s):

Gut Microbiota ◽

Short Chain Fatty Acids ◽

Fecal Microbiota ◽

Glycoside Hydrolase Family ◽

Metagenomic Sequencing ◽

Shotgun Metagenomic Sequencing ◽

Rdna Sequencing ◽

Key Factor ◽

Methane Metabolism ◽

Hydrolase Family

Domestication is a key factor of genetic variation; however, the mechanism by which domestication alters gut microbiota is poorly understood. Here, to explore the variation in the structure, function, rapidly evolved genes (REGs), and enzyme profiles of cellulase and hemicellulose in fecal microbiota, we studied the fecal microbiota in wild, half-blood, and domestic yaks based on 16S rDNA sequencing, shotgun-metagenomic sequencing, and the measurement of short-chain-fatty-acids (SCFAs) concentration. Results indicated that wild and half-blood yaks harbored an increased abundance of the phylum Firmicutes and reduced abundance of the genus Akkermansia, which are both associated with efficient energy harvesting. The gut microbial diversity decreased in domestic yaks. The results of the shotgun-metagenomic sequencing showed that the wild yak harbored an increased abundance of microbial pathways that play crucial roles in digestion and growth of the host, whereas the domestic yak harbored an increased abundance of methane-metabolism-related pathways. Wild yaks had enriched amounts of REGs in energy and carbohydrate metabolism pathways, and possessed a significantly increased abundance of cellulases and endohemicellulases in the glycoside hydrolase family compared to domestic yaks. The concentrations of acetic, propionic, n-butyric, i-butyric, n-valeric, and i-valeric acid were highest in wild yaks. Our study displayed the domestic effect on the phenotype of composition, function in gut microbiota, and SCFAs associated with gut microbiota, which had a closely association with the growth performance of the livestock. These findings may enlighten the researchers to construct more links between economic characteristics and gut microbiota, and develop new commercial strains in livestock based on the biotechnology of gut microbiota.

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Obesity influences composition of salivary and fecal microbiota and impacts the interactions between bacterial taxa

10.1101/2021.10.12.464168 ◽

2021 ◽

Author(s):

Andrei Bombin ◽

Jonathan D. Mosley ◽

Shun Yan ◽

Sergei Bombin ◽

Jane F. Ferguson

Keyword(s):

Bacterial Communities ◽

Community Dynamics ◽

Fecal Microbiota ◽

Health Concern ◽

Cardiometabolic Health ◽

Strong Correlations ◽

Microbiome Composition ◽

Bacterial Community Dynamics ◽

Obesity Status ◽

Rdna Sequencing

Obesity is an increasing global health concern and is associated with a broad range of morbidities. The gut microbiota are increasingly recognized as important contributors to obesity and cardiometabolic health. This study aimed to characterize oral and gut microbial communities, and evaluate host:microbiota interactions between clinical obesity classifications. We performed 16S rDNA sequencing on fecal and salivary samples, global metabolomics profiling on plasma and stool samples, and dietary profiling in 135 healthy individuals. We grouped individuals by obesity status, based on body mass index (BMI), including lean (BMI 18-24.9), overweight (BMI 25-29.9), or obese (BMI ≥30). We analyzed differences in microbiome composition, community inter-relationships, and predicted microbial function by obesity status. We found that salivary bacterial communities of lean and obese individuals were compositionally and phylogenetically distinct. An increase in obesity status was positively associated with strong correlations between bacterial taxa, particularly with bacterial groups implicated in metabolic disorders including Fretibacterium, and Tannerella. Consumption of sweeteners, especially xylitol, significantly influenced compositional and phylogenetic diversities of salivary and fecal bacterial communities. In addition, obesity groups exhibited differences in predicted bacterial metabolic activity, which was correlated with host's metabolite concentrations. Overall, obesity was associated with distinct changes in bacterial community dynamics, particularly in saliva. Consideration of microbiome community structure, and inclusion of salivary samples may improve our ability to understand pathways linking microbiota to obesity and cardiometabolic disease.

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The role of microbiota in pathogenesis and development of viral infections

Journal of Education, Health and Sport ◽

10.12775/jehs.2021.11.12.025 ◽

2021 ◽

Vol 11 (12) ◽

pp. 320-326

Author(s):

Marcela Maksymowicz ◽

Gabriela Ręka ◽

Piotr Machowiec ◽

Halina Piecewicz-Szczęsna

Keyword(s):

Immune System ◽

Infectious Diseases ◽

Viral Infections ◽

Fecal Microbiota Transplantation ◽

Short Chain Fatty Acids ◽

Fecal Microbiota ◽

Gardnerella Vaginalis ◽

Microbiome Composition ◽

Pubmed Database

Introduction and purpose The microbiota plays an important role in human metabolism, immune system, and development of many chronic diseases, cancers, and infectious diseases. The aim of the study is to present the role of gut microbiota in viral infections, including HBV, Herpesviridae, HIV, and SARS-CoV-2. The newest publications from the last 5 years available on the PubMed database were taken into account. A brief description of the state of knowledge The mechanism by which bacterias have an impact on viral infection is based on a synthesis of specific short-chain fatty acids (SCFAs) and modulation of cytokine release and immune system function by bacterias. Domination of Gardnerella vaginalis and lack of Lactobacillus in the vaginal microbiome increased the risk of HSV-2 infection in women. Inflammation of the genital tract can influence susceptibility to HIV infection, but probiotics via enhancement of the gut barrier integrity, change TH17/Treg ratio, can restore microbiome composition. LPS - component of the structure of Gram-negative bacteria can be a marker of HBV infection. In the airway microbiome of patients with COVID-19 opportunistic microorganisms were identified. Conclusions Diet, intake of probiotics, fecal microbiota transplantation (FMT) are interventions that might be efficient methods in prophylaxis and treatment of viral diseases. Further studies are needed to evaluate the mechanism of action of microbiome in pathogenesis of infectious diseases.

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Combinatorial Effects of Soluble, Insoluble, and Organic Extracts from Jerusalem Artichokes on Gut Microbiota in Mice

Microorganisms ◽

10.3390/microorganisms8060954 ◽

2020 ◽

Vol 8 (6) ◽

pp. 954 ◽

Cited By ~ 1

Author(s):

Hiroyuki Sasaki ◽

Yijin Lyu ◽

Yuki Nakayama ◽

Fumiaki Nakamura ◽

Aya Watanabe ◽

...

Keyword(s):

Gut Microbiota ◽

Short Chain Fatty Acids ◽

Fecal Microbiota ◽

Water Soluble ◽

Bioactive Substances ◽

Organic Extract ◽

Organic Extracts ◽

Water Soluble Extract ◽

The Individual ◽

Digestive Health

Jerusalem artichokes contain high amounts of inulin, which is a prebiotic that supports digestive health, as well as a variety of insoluble fibers and caffeoylquinic acid. The individual impact of these components on gut microbiota is well known; however, the combinatorial effects are less clear. In this investigation, we fractionated Jerusalem artichokes into three parts (water-soluble extract, insoluble extract, and organic extract) and powdered them. Mice were fed a high-fat diet that included one or more of these extracts for 10 days, and then their cecal pH, cecal short-chain fatty acids (SCFAs), and fecal microbiota were evaluated. The combination of the water-soluble and organic extract decreased cecal pH and increased the concentration of SCFAs and led to dynamic changes in the composition of the gut microbiota. These results demonstrate that both the water-soluble and organic extracts in Jerusalem artichokes are bioactive substances that are capable of changing SCFA production and the composition of gut microbiota. Powdered Jerusalem artichokes, rather than inulin supplements, may be superior for promoting a healthy gut.

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Short Chain Fatty Acids and Fecal Microbiota Abundance in Humans with Obesity: A Systematic Review and Meta-Analysis

Nutrients ◽

10.3390/nu11102512 ◽

2019 ◽

Vol 11 (10) ◽

pp. 2512 ◽

Cited By ~ 14

Author(s):

Kyu Nam Kim ◽

Yao Yao ◽

Sang Yhun Ju

Keyword(s):

Fatty Acids ◽

Meta Analysis ◽

Short Chain Fatty Acids ◽

Human Case ◽

Fecal Microbiota ◽

Short Chain ◽

Case Control Studies ◽

The Difference ◽

Mean Differences ◽

Chain Fatty Acids

There have been mixed results regarding the relationship among short chain fatty acids (SCFAs), microbiota, and obesity in human studies. We selected studies that provided data on SCFA levels or fecal microbiota abundance in obese and nonobese individuals and then combined the published estimates using a random-effects meta-analysis. Obese individuals had significantly higher fecal concentrations of acetate (SMD (standardized mean differences) = 0.87, 95% CI (confidence interva) = 0.24–1.50, I2 (I–squared) = 88.5), propionate (SMD = 0.86, 95% CI = 0.35–1.36, I2 = 82.3%), and butyrate (SMD = 0.78, 95% CI = 0.29–1.27, I2 = 81.7%) than nonobese controls. The subgroup analyses showed no evidence of heterogeneity among obese individuals with a BMI >30 kg/m2 (I2 = 0.0%). At the phylum level, the abundance of fecal microbiota was reduced in obese compared to nonobese individuals, but the difference was not statistically significant (Bacteroidetes phylum, SMD = −0.36, 95% CI = −0.73–0.01; Firmicutes phylum, SMD = −0.10, 95% CI = −0.31–0.10). The currently available human case-control studies show that obesity is associated with high levels of SCFA but not gut microbiota richness at the phylum level. Additional well-designed studies with a considerable sample size are needed to clarify whether this association is causal, but it is also necessary to identify additional contributors to SCFA production, absorption, and excretion in humans.

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In Vitro Prebiotic Effects of Malto-Oligosaccharides Containing Water-Soluble Dietary Fiber

Molecules ◽

10.3390/molecules25215201 ◽

2020 ◽

Vol 25 (21) ◽

pp. 5201

Author(s):

Eun Yeong Jang ◽

Ki-Bae Hong ◽

Yeok Boo Chang ◽

Jungcheul Shin ◽

Eun Young Jung ◽

...

Keyword(s):

Short Chain Fatty Acid ◽

Carbon Sources ◽

Basal Medium ◽

In Vitro Digestion ◽

Fecal Microbiota ◽

Water Soluble ◽

Beneficial Bacteria ◽

Soluble Dietary Fiber ◽

In Vitro Fermentation

This study measured the proliferative activity of malto-oligosaccharide (MOS) as a prebiotic against Bifidobacteria, resistance to digestion in vitro, and changes during in vitro fermentation by human fecal microorganisms. It consisted of 21.74%, 18.84%, and 11.76% of maltotriose, maltotetraose, and maltopentaose produced by amylase (HATT), respectively. When 1% of MOS was added to a modified PYF medium as the carbon source, proliferation of Bifidobacterium breve was increased significantly. During the in vitro digestion test, MOS was partially degraded by intestinal enzymes. Fermentation characteristics by human fecal microorganisms were evaluated by adding 1% galacto-oligosaccharide (GOS), as well as 1% and 2% MOS as carbon sources to the basal medium, respectively. In comparison with the addition of 1% of MOS and GOS, the total short chain fatty acid (SCFA) content increased over time when 2% of MOS was added. The species diversity and richness of intestinal microbiota increased significantly with 2% MOS compared to those with 1% GOS. In addition, the 2% addition of MOS reduced intestinal pathobiont microorganisms and increased commensal microorganisms including Bifidobacterium genus. Collectively, MOS produced by amylase increased the SCFA production and enhanced the growth of beneficial bacteria during in vitro fermentation by human fecal microbiota.

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ANALISA KANDUNGAN BETA-GLUKAN LARUT AIR DAN LARUT ALKALI DARI TUBUH BUAH JAMUR TIRAM (Pleurotus ostreatus) DAN SHIITAKE (Lentinus edodes)

Jurnal Sains dan Teknologi Indonesia ◽

10.29122/jsti.v13i3.894 ◽

2013 ◽

Vol 13 (3) ◽

Author(s):

Netty Widyastuti ◽

Teguh Baruji ◽

Henky Isnawan ◽

Priyo Wahyudi ◽

Donowati Donowati

Keyword(s):

Molecular Structure ◽

Molecular Weight ◽

Immune System ◽

Pleurotus Ostreatus ◽

Water Soluble ◽

Low Molecular Weight ◽

Lentinus Edodes ◽

Beta Glucan ◽

Oyster Mushrooms ◽

The Difference

Beta glucan is a polysaccharide compound, generally not soluble inwater and resistant to acid. Beta glucan is used as an immunomodulator (enhancing the immune system) in mammals is usually a beta-glucan soluble in water, easily absorbed and has a low molecular weight. Several example of beta-glucan such as cellulose (β-1 ,4-glucan), lentinan (β-1 0.6-glucan) and (β-1 ,3-glucan), pleuran (β-1, 6 and β-1 ,3-glucan) are isolated from species of fungi Basidiomycota include mushrooms (Pleurotus ostreatus) and shiitake (Lentinus edodes).The purpose of thisresearch activity is to obtain beta-glucan compound that can be dissolved in water and in alkali derived from fungi Basidiomycota, i.e, Oyster mushrooms (Pleurotus ostreatus) and shiitake (Lentinus edodes). The result of beta-glucan compared to characterize the resulting beta glucan that is molecular structure . The difference of beta glucan extraction is based on the differences in solubility of beta-glucan. Beta glucan could be water soluble and insoluble water.

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Gastrointestinal disturbance and effect of fecal microbiota transplantation in discharged COVID-19 patients

Journal of Medical Case Reports ◽

10.1186/s13256-020-02583-7 ◽

2021 ◽

Vol 15 (1) ◽

Author(s):

Fengqiong Liu ◽

Shanliang Ye ◽

Xin Zhu ◽

Xuesong He ◽

Shengzhou Wang ◽

...

Keyword(s):

B Cells ◽

Fecal Microbiota Transplantation ◽

Gastrointestinal Symptoms ◽

Fecal Microbiota ◽

Case Presentation ◽

Microbiome Composition ◽

Operational Taxonomic Units ◽

Gut Dysbiosis ◽

Rehabilitative Intervention ◽

Oral Capsule

Abstract Background To investigate the potential beneficial effect of fecal microbiota transplantation (FMT) on gastrointestinal symptoms, gut dysbiosis and immune status in discharged COVID-19 patients. Case presentation A total of 11 COVID-19 patients were recruited in April, 2020, about one month on average after they were discharged from the hospital. All subjects received FMT for 4 consecutive days by oral capsule administrations with 10 capsules for each day. In total, 5 out of 11 patients reported to be suffered from gastrointestinal symptoms, which were improved after FMT. After FMT, alterations of B cells were observed, which was characterized as decreased naive B cell (P = 0.012) and increased memory B cells (P = 0.001) and non-switched B cells (P = 0.012).The microbial community richness indicated by operational taxonomic units number, observed species and Chao1 estimator was marginally increased after FMT. Gut microbiome composition of discharged COVID-19 patients differed from that of the general population at both phylum and genera level, which was characterized with a lower proportion of Firmicutes (41.0%) and Actinobacteria (4.0%), higher proportion of Bacteroidetes (42.9%) and Proteobacteria (9.2%). FMT can partially restore the gut dysbiosis by increasing the relative abundance of Actinobacteria (15.0%) and reducing Proteobacteria (2.8%) at the phylum level. At the genera level, Bifidobacterium and Faecalibacterium had significantly increased after FMT. Conclusions After FMT, altered peripheral lymphocyte subset, restored gut microbiota and alleviated gastrointestinal disorders were observe, suggesting that FMT may serve as a potential therapeutic and rehabilitative intervention for the COVID-19.

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Associations between gut microbiome, short chain fatty acids and blood pressure across ethnic groups: the HELIUS study

European Heart Journal ◽

10.1093/ehjci/ehaa946.2701 ◽

2020 ◽

Vol 41 (Supplement_2) ◽

Author(s):

B Verhaar ◽

D Collard ◽

A Prodan ◽

J.H.M Levels ◽

A.H Zwinderman ◽

...

Keyword(s):

Blood Pressure ◽

Fatty Acids ◽

Ethnic Groups ◽

Gut Microbiome ◽

Short Chain Fatty Acids ◽

Short Chain ◽

Funding Source ◽

Microbiome Composition ◽

Helius Study ◽

Chain Fatty Acids

Abstract Background Gut microbiome composition is shaped by a combination of host genetic make-up and dietary habits. In addition, large ethnic differences exist in microbiome composition. Several studies in humans and animals have shown that differences in gut microbiota and its metabolites, including short chain fatty acids (SCFA), are associated with blood pressure (BP). We hypothesized that gut microbiome composition and its metabolites may be differently associated with BP across ethnic groups. Purpose To investigate associations of gut microbiome composition and fecal SCFA levels with BP across different ethnic groups. Methods We assessed the association between gut microbiome composition and office BP among 4672 subjects (mean age 49.8±11.7 years, 52%F) of 6 different ethnic groups participating in the HELIUS study. Gut microbiome composition was determined using 16S rRNA sequencing. Associations between microbiome composition and blood pressure were assessed using machine learning prediction models. The resulting best predictors were correlated with BP using Spearman's rank correlations. Fecal SCFA levels were measured with high-performance liquid chromatography in an age- and body mass index (BMI)-matched subgroup of 200 participants with either extreme low or high systolic BP. Differences in abundances of best predictors and fecal SCFA levels between high and low BP groups were assessed with Mann-Whitney U tests. Results Gut microbiome composition explained 4.4% of systolic BP variance. Best predictors for systolic BP included Roseburia spp. (ρ −0.15, p<0.001), Clostridium spp. (ρ −0.14, p<0.001), Romboutsia spp. (ρ −0.10, p<0.001), and Ruminococceae spp. (ρ −0.15, p<0.001) (Figure 1). Explained variance of the microbiome composition was highest in Dutch subjects (4.8%), but very low in African Surinamese, Ghanaian, and Turkish ethnic groups (ranging from 0–0.77%) Hence, we selected only participants with Dutch ethnicity for the matched subgroup. Participants with high BP had lower abundance of Roseburia hominis (p<0.01) and Roseburia spp. (p<0.05) compared to participants with low BP. However, fecal acetate (p<0.05) and propionate (p<0.01) levels were higher in participants with high BP. Conclusions In this cross-sectional study, gut microbiome composition was moderately associated with BP. Associations were strongly divergent between ethnic groups, with strongest associations in Dutch participants. Intriguingly, while Dutch participants with high BP had lower abundances of several SCFA-producing microbes, they had higher fecal SCFA levels. Intervention studies with SCFAs could provide more insight in the effects of these metabolites on BP. Funding Acknowledgement Type of funding source: Public Institution(s). Main funding source(s): The Academic Medical Center (AMC) of Amsterdam and the Public Health Service of Amsterdam (GGD Amsterdam) provided core financial support for HELIUS. The HELIUS study is also funded by research grants of the Dutch Heart Foundation (Hartstichting; grant no. 2010T084), the Netherlands Organization for Health Research and Development (ZonMw; grant no. 200500003), the European Integration Fund (EIF; grant no. 2013EIF013) and the European Union (Seventh Framework Programme, FP-7; grant no. 278901).

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The Combined Effects of Magnesium Oxide and Inulin on Intestinal Microbiota and Cecal Short-Chain Fatty Acids

Nutrients ◽

10.3390/nu13010152 ◽

2021 ◽

Vol 13 (1) ◽

pp. 152

Author(s):

Kanako Omori ◽

Hiroki Miyakawa ◽

Aya Watanabe ◽

Yuki Nakayama ◽

Yijin Lyu ◽

...

Keyword(s):

Fatty Acids ◽

Acetic Acid ◽

Dietary Fiber ◽

Magnesium Oxide ◽

Acid Concentration ◽

Short Chain Fatty Acids ◽

Water Soluble ◽

Short Chain ◽

Acetic Acid Concentration ◽

Chain Fatty Acids

Constipation is a common condition that occurs in many people worldwide. While magnesium oxide (MgO) is often used as the first-line drug for chronic constipation in Japan, dietary fiber intake is also recommended. Dietary fiber is fermented by microbiota to produce short-chain fatty acids (SCFAs). SCFAs are involved in regulating systemic physiological functions and circadian rhythm. We examined the effect of combining MgO and the water-soluble dietary fiber, inulin, on cecal SCFA concentration and microbiota in mice. We also examined the MgO administration timing effect on cecal SCFAs. The cecal SCFA concentrations were measured by gas chromatography, and the microbiota was determined using next-generation sequencing. Inulin intake decreased cecal pH and increased cecal SCFA concentrations while combining MgO increased the cecal pH lowered by inulin and decreased the cecal SCFA concentrations elevated by inulin. When inulin and MgO were combined, significant changes in the microbiota composition were observed compared with inulin alone. The MgO effect on the cecal acetic acid concentration was less when administered at ZT12 than at ZT0. In conclusion, this study suggests that MgO affects cecal SCFA and microbiota during inulin feeding, and the effect on acetic acid concentration is time-dependent.

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