Displaying publications 81 - 100 of 240 in total

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  1. Parkinson's disease and the gastrointestinal microbiome
    Lubomski M, Tan AH, Lim SY, Holmes AJ, Davis RL, Sue CM
    J Neurol, 2020 Sep;267(9):2507-2523.
    PMID: 31041582 DOI: 10.1007/s00415-019-09320-1
    Recently, there has been a surge in awareness of the gastrointestinal microbiome (GM) and its role in health and disease. Of particular note is an association between the GM and Parkinson's disease (PD) and the realisation that the GM can act via a complex bidirectional communication between the gut and the brain. Compelling evidence suggests that a shift in GM composition may play an important role in the pathogenesis of PD by facilitating the characteristic ascending neurodegenerative spread of α-synuclein aggregates from the enteric nervous system to the brain. Here, we review evidence linking GM changes with PD, highlighting mechanisms supportive of pathological α-synuclein spread and intestinal inflammation in PD. We summarise existing patterns and correlations seen in clinical studies of the GM in PD, together with the impacts of non-motor symptoms, medications, lifestyle, diet and ageing on the GM. Roles of GM modulating therapies including probiotics and faecal microbiota transplantation are discussed. Encouragingly, alterations in the GM have repeatedly been observed in PD, supporting a biological link and highlighting it as a potential therapeutic target.
    Matched MeSH terms: Gastrointestinal Microbiome
  2. Dietary phytochemicals that influence gut microbiota: Roles and actions as anti-Alzheimer agents
    Wang Y, Lim YY, He Z, Wong WT, Lai WF
    Crit Rev Food Sci Nutr, 2021 Feb 09.
    PMID: 33559482 DOI: 10.1080/10408398.2021.1882381
    The last decide has witnessed a growing research interest in the role of dietary phytochemicals in influencing the gut microbiota. On the other hand, recent evidence reveals that dietary phytochemicals exhibit properties of preventing and tackling symptoms of Alzheimer's disease, which is a neurodegenerative disease that has also been linked with the status of the gut microbiota over the last decade. Till now, little serious discussions, however, have been made to link recent understanding of Alzheimer's disease, dietary phytochemicals and the gut microbiota together and to review the roles played by phytochemicals in gut dysbiosis induced pathologies of Alzheimer's disease. Deciphering these connections can provide insights into the development and future use of dietary phytochemicals as anti-Alzheimer drug candidates. This review aims at presenting latest evidence in the modulating role of phytochemicals in the gut microbiota and its relevance to Alzheimer's disease and summarizing the mechanisms behind the modulative activities. Limitations of current research in this field and potential directions will also be discussed for future research on dietary phytochemicals as anti-Alzheimer agents.
    Matched MeSH terms: Gastrointestinal Microbiome
  3. Fulltext Nanotechnology-Based Strategies for Berberine Delivery System in Cancer Treatment: Pulling Strings to Keep Berberine in Power
    Javed Iqbal M, Quispe C, Javed Z, Sadia H, Qadri QR, Raza S, et al.
    Front Mol Biosci, 2020;7:624494.
    PMID: 33521059 DOI: 10.3389/fmolb.2020.624494
    Cancer is a multifactorial disease characterized by complex molecular landscape and altered cell pathways that results in an abnormal cell growth. Natural compounds are target-specific and pose a limited cytotoxicity; therefore, can aid in the development of new therapeutic interventions for the treatment of this versatile disease. Berberine is a member of the protoberberine alkaloids family, mainly present in the root, stem, and bark of various trees, and has a reputed anticancer activity. Nonetheless, the limited bioavailability and low absorption rate are the two major hindrances following berberine administration as only 0.5% of ingested berberine absorbed in small intestine while this percentage is further decreased to 0.35%, when enter in systemic circulation. Nano-based formulation is believed to be an ideal candidate to increase absorption percentage as at nano scale level, compounds can absorb rapidly in gut. Nanotechnology-based therapeutic approaches have been implemented to overcome such problems, ultimately promoting a higher efficacy in the treatment of a plethora of diseases. This review present and critically discusses the anti-proliferative role of berberine and the nanotechnology-based therapeutic strategies used for the nano-scale delivery of berberine. Finally, the current approaches and promising perspectives of latest delivery of this alkaloid are also critically analyzed and discussed.
    Matched MeSH terms: Gastrointestinal Microbiome
  4. Irritable bowel syndrome and inflammatory bowel disease overlap syndrome: pieces of the puzzle are falling into place
    Abdul Rani R, Raja Ali RA, Lee YY
    Intest Res, 2016 Oct;14(4):297-304.
    PMID: 27799880
    Irritable bowel syndrome (IBS), a common gastrointestinal disorder involving the gut-brain axis, and inflammatory bowel disease (IBD), a chronic relapsing inflammatory disorder, are both increasing in incidence and prevalence in Asia. Both have significant overlap in terms of symptoms, pathophysiology, and treatment, suggesting the possibility of IBS and IBD being a single disease entity albeit at opposite ends of the spectrum. We examined the similarities and differences in IBS and IBD, and offer new thoughts and approaches to the disease paradigm.
    Matched MeSH terms: Gastrointestinal Microbiome
  5. Fulltext 16S rRNA Gene Sequencing for Deciphering the Colorectal Cancer Gut Microbiome: Current Protocols and Workflows
    Osman MA, Neoh HM, Ab Mutalib NS, Chin SF, Jamal R
    Front Microbiol, 2018;9:767.
    PMID: 29755427 DOI: 10.3389/fmicb.2018.00767
    The human gut holds the densest microbiome ecosystem essential in maintaining a healthy host physiology, whereby disruption of this ecosystem has been linked to the development of colorectal cancer (CRC). The advent of next-generation sequencing technologies such as the 16S rRNA gene sequencing has enabled characterization of the CRC gut microbiome architecture in an affordable and culture-free approach. Nevertheless, the lack of standardization in handling and storage of biospecimens, nucleic acid extraction, 16S rRNA gene primer selection, length, and depth of sequencing and bioinformatics analyses have contributed to discrepancies found in various published studies of this field. Accurate characterization of the CRC microbiome found in different stages of CRC has the potential to be developed into a screening tool in the clinical setting. This mini review aims to concisely compile all available CRC microbiome studies performed till end of 2016 and to suggest standardized protocols that are crucial in developing a gut microbiome screening panel for CRC.
    Matched MeSH terms: Gastrointestinal Microbiome
  6. Effects of autochthonous probiotic feeding on performances, carcass traits, serum composition and faecal microflora of broiler chickens
    Idoui T, Karam N
    Sains Malaysiana, 2016;45:347-353.
    The objective of this study was to investigate the effect of autochthonous Lactobacillus plantarum feeding on growth performance, carcass traits, serum composition and faecal microflora of broiler chickens. The results showed a significant positive effect (p< 0.05) of probiotic on body weight and feed conversion ratio. Coliform counts in the fecal matter of broiler chickens receiving probiotic were lower than the analogous population in control birds (p<0.05). In contrary, lactic acid bacteria (LAB) number increased (p<0.05) in fecal matter of experimental group. At the end of the study, the degree of serum cholesterol reduction resulted in a 20.31% compared to the control group (p<0.05). The experimental group had significantly lower serum triglycerides (p<0.05). It was concluded that autochthonous probiotic improved growth and feed efficiency in broilers chickens and considering the improvements in carcass traits. This probiotic possess the property of reducing cholesterol and triglycerides in the blood and possess a positive effect on the gut microflora.
    Matched MeSH terms: Gastrointestinal Microbiome
  7. Impact of DNA extraction methods on the observed microbial communities from the intestinal flora of the penaeid shrimp Litopenaeus vannamei
    Jiang B, Sun J, Lv A, Hu X, Shi H, Sung Y, et al.
    FEMS Microbiol Lett, 2019 05 01;366(9).
    PMID: 31074797 DOI: 10.1093/femsle/fnz099
    Two DNA extraction methods, the Zirmil-beating cell disruption method (ZBC) and the QIAamp fast DNA stool mini kit (QIA), were used to extract DNA from the intestinal flora of the penaeid shrimp Litopenaeus vannamei, and their microbial communities were analyzed using 16S rDNA high-throughput sequencing. Results were obtained in terms of the number of reads, alpha diversity indexes, beta diversity indexes and taxonomic composition. The alpha diversity indexes of the community, according to the ZBC method, were higher than those according to the QIA method. Furthermore, results from the three samples using the ZBC method were less consistent than those where the QIA method was used. Further, using the latter method led to substantive clustering. It is suggested that the QIA method is more stable and repeatable than the ZBC method. Although the two extraction methods shared the major abundant microflora based on 16S rDNA high-throughput sequencing, bias associated with diversity analysis indexes and certain species was observed.
    Matched MeSH terms: Gastrointestinal Microbiome
  8. Fulltext Metagenomic 16S rDNA amplicon data of microbial diversity of guts of fully fed tropical bed bugs, Cimex hemipterus (F.) (Hemiptera: Cimicidae)
    Lim L, Ab Majid AH
    Data Brief, 2020 Jun;30:105575.
    PMID: 32368598 DOI: 10.1016/j.dib.2020.105575
    The metagenomic datasets of the microbial DNA from tropical bed bugs (Cimex hemipterus) after feeding on human blood were presented. Next-generation sequencing of the community DNA was carried out on an Illumina Miseq platform and the raw fastq files were analyzed using QIIME (version 1.9.1). The metagenome of three samples comprised of 108,198 sequences representing 44,646,263 bps with a mean length of 412.63 bps. The sequence data is accessible at the NCBI SRA under the bioproject number PRJNA600667. Community analysis showed Proteobacteria was the most abundance (more than 99%) microbial community that present in the guts of fully fed tropical bed bugs.
    Matched MeSH terms: Gastrointestinal Microbiome
  9. Acclimatisation-induced stress influenced host metabolic and gut microbial composition change
    Yap IK, Kho MT, Lim SH, Ismail NH, Yam WK, Chong CW
    Mol Biosyst, 2015 Jan;11(1):297-306.
    PMID: 25382376 DOI: 10.1039/c4mb00463a
    Understanding the basal gut bacterial community structure and the host metabolic composition is pivotal for the interpretation of laboratory treatments designed to answer questions pertinent to host-microbe interactions. In this study, we report for the first time the underlying gut microbiota and systemic metabolic composition in BALB/c mice during the acclimatisation period. Our results showed that stress levels were reduced in the first three days of the study when the animals were subjected to repetitive handling daily but the stress levels were increased when handling was carried out at lower frequencies (weekly). We also observed a strong influence of stress on the host metabolism and commensal compositional variability. In addition, temporal biological compartmental variations in the responses were observed. Based on these results, we suggest that consistency in the frequency and duration of laboratory handling is crucial in murine models to minimise the impact of stress levels on the commensal and host metabolism dynamics. Furthermore, caution is advised in consideration of the temporal delay effect when integrating metagenomics and metabonomics data across different biological matrices (i.e. faeces and urine).
    Matched MeSH terms: Gastrointestinal Microbiome*
  10. Fulltext Helicobacter pylori and gut microbiota modulate energy homeostasis prior to inducing histopathological changes in mice
    Khosravi Y, Bunte RM, Chiow KH, Tan TL, Wong WY, Poh QH, et al.
    Gut Microbes, 2016;7(1):48-53.
    PMID: 26939851 DOI: 10.1080/19490976.2015.1119990
    Helicobacter pylori have been shown to influence physiological regulation of metabolic hormones involved in food intake, energy expenditure and body mass. It has been proposed that inducing H. pylori-induced gastric atrophy damages hormone-producing endocrine cells localized in gastric mucosal layers and therefore alter their concentrations. In a recent study, we provided additional proof in mice under controlled conditions that H. pylori and gut microbiota indeed affects circulating metabolic gut hormones and energy homeostasis. In this addendum, we presented data from follow-up investigations that demonstrated H. pylori and gut microbiota-associated modulation of metabolic gut hormones was independent and precedes H. pylori-induced histopathological changes in the gut of H. pylori-infected mice. Thus, H. pylori-associated argumentation of energy homeostasis is not caused by injury to endocrine cells in gastric mucosa.
    Matched MeSH terms: Gastrointestinal Microbiome*
  11. Fulltext Comparative study of gut microbiota in wild and captive Malaysian Mahseer (Tor tambroides)
    Tan CK, Natrah I, Suyub IB, Edward MJ, Kaman N, Samsudin AA
    Microbiologyopen, 2019 05;8(5):e00734.
    PMID: 30353678 DOI: 10.1002/mbo3.734
    AIMS: The aim of this study was to identify and compare the gut microbial community of wild and captive Tor tambroides through 16S rDNA metagenetic sequencing followed by functions prediction.

    METHODS AND RESULTS: The library of 16S rDNA V3-V4 hypervariable regions of gut microbiota was amplified and sequenced using Illumina MiSeq. The sequencing data were analyzed using Quantitative Insights into Microbial Ecology (QIIME) pipeline and Phylogenetic Investigation of Communities by Reconstruction of Unobserved States (PICRUSt). The most abundant bacterial phyla in both wild and captive T. tambroides were Firmicutes, Proteobacteria, Fusobacteria and Bacteroidetes. Cetobacterium spp., Peptostreptococcaceae family, Bacteroides spp., Phosphate solubilizing bacteria PSB-M-3, and Vibrio spp. were five most abundant OTU in wild T. tambroides as compared to Cetobacterium spp., Citrobacter spp., Aeromonadaceae family, Peptostreptococcaceae family and Turicibacter spp. in captive T. tambroides.

    CONCLUSION: In this study, the specimens of the wild T. tambroides contain more diverse gut microbiota than of the captive ones. The results suggested that Cetobacterium spp. is one of the core microbiota in guts of T. tambroides. Besides, high abundant Bacteroides spp., Citrobacter spp., Turicibacter spp., and Bacillus spp. may provide important functions in T. tambroides guts.

    SIGNIFICANCE AND IMPACT OF THE STUDY: The results of this study provide significant information of T. tambroides gut microbiota for further understanding of their physiological functions including growth and disease resistance.

    Matched MeSH terms: Gastrointestinal Microbiome*
  12. Gut bacteria of animals/pests living in polluted environments are a potential source of antibacterials
    Akbar N, Siddiqui R, Sagathevan KA, Khan NA
    Appl Microbiol Biotechnol, 2019 May;103(10):3955-3964.
    PMID: 30941460 DOI: 10.1007/s00253-019-09783-2
    The morbidity and mortality associated with bacterial infections have remained significant despite chemotherapeutic advances. With the emergence of drug-resistant bacterial strains, the situation has become a serious threat to the public health. Thus, there is an urgent need to identify novel antibacterials. The majority of antibiotics available in the market are produced by bacteria isolated from soil. However, the low-hanging fruit has been picked; hence, there is a need to mine bacteria from unusual sources. With this in mind, it is important to note that animals and pests such as cockroaches, snake, crocodiles, and water monitor lizard come across pathogenic bacteria regularly, yet flourish in contaminated environments. These species must have developed methods to defend themselves to counter pathogens. Although the immune system is known to possess antiinfective properties, gut bacteria of animals/pests may also offer a potential source of novel antibacterial agents, and it is the subject of this study. This paper discusses our current knowledge of bacteria isolated from land and marine animals with antibacterial properties and to propose untapped sources for the isolation of bacteria to mine potentially novel antibiotic molecules.
    Matched MeSH terms: Gastrointestinal Microbiome*
  13. Lactobacillus sp. improved microbiota and metabolite profiles of aging rats
    Hor YY, Lew LC, Jaafar MH, Lau AS, Ong JS, Kato T, et al.
    Pharmacol Res, 2019 08;146:104312.
    PMID: 31207344 DOI: 10.1016/j.phrs.2019.104312
    Aging is closely associated with altered gut function and composition, in which elderly were reported with reduced gut microbiota diversity and increased incidence of age-related diseases. Probiotics have been shown to exert beneficial health-promoting effects through modulation of intestinal microflora biodiversity, thus the effects of probiotics administration on D-galactose (D-gal) senescence-induced rat were evaluated based on the changes in gut microbiota and metabolomic profiles. Upon senescence induction, the ratio of Firmicutes/ Bacteroidetes was significantly lowered, while treatment with Lactobacillus helveticus OFS 1515 and L. fermentum DR9 increased the ratio at the phylum level (P 
    Matched MeSH terms: Gastrointestinal Microbiome/physiology*
  14. Analyzing the Secretome of Gut Microbiota as the Next Strategy For Early Detection of Colorectal Cancer
    Megat Mohd Azlan PI, Chin SF, Low TY, Neoh HM, Jamal R
    Proteomics, 2019 05;19(10):e1800176.
    PMID: 30557447 DOI: 10.1002/pmic.201800176
    Dysbiosis of gut microbiome can contribute to inflammation, and subsequently initiation and progression of colorectal cancer (CRC). Throughout these stages, various proteins and metabolites are secreted to the external environment by microorganisms or the hosts themselves. Studying these proteins may help enhance our understanding of the host-microorganism relationship or they may even serve as useful biomarkers for CRC. However, secretomic studies of gut microbiome of CRC patients, until now, are scarcely performed. In this review article, the focus is on the roles of gut microbiome in CRC, the current findings on CRC secretome are highlighted, and the emerging challenges and strategies to drive forward this area of research are addressed.
    Matched MeSH terms: Gastrointestinal Microbiome*
  15. Atlantic Salmon (Salmo salar L.) Gastrointestinal Microbial Community Dynamics in Relation to Digesta Properties and Diet
    Zarkasi KZ, Taylor RS, Abell GC, Tamplin ML, Glencross BD, Bowman JP
    Microb Ecol, 2016 Apr;71(3):589-603.
    PMID: 26780099 DOI: 10.1007/s00248-015-0728-y
    To better understand salmon GI tract microbial community dynamics in relation to diet, a feeding trial was performed utilising diets with different proportions of fish meal, protein, lipid and energy levels. Salmon gut dysfunction has been associated with the occurrence of casts, or an empty hind gut. A categorical scoring system describing expressed digesta consistency was evaluated in relation to GI tract community structure. Faster growing fish generally had lower faecal scores while the diet cohorts showed minor differences in faecal score though the overall lowest scores were observed with a low protein, low energy diet. The GI tract bacterial communities were highly dynamic over time with the low protein, low energy diet associated with the most divergent community structure. This included transiently increased abundance of anaerobic (Bacteroidia and Clostridia) during January and February, and facultatively anaerobic (lactic acid bacteria) taxa from February onwards. The digesta had enriched populations of these groups in relation to faecal cast samples. The majority of samples (60-86 %) across all diet cohorts were eventually dominated by the genus Aliivibrio. The results suggest that an interaction between time of sampling and diet is most strongly related to community structure. Digesta categorization revealed microbes involved with metabolism of diet components change progressively over time and could be a useful system to assess feeding responses.
    Matched MeSH terms: Gastrointestinal Microbiome*
  16. Fulltext Exploring the Role of Gut Bacteria in Health and Disease in Preterm Neonates
    Lee JK, Hern Tan LT, Ramadas A, Ab Mutalib NS, Lee LH
    Int J Environ Res Public Health, 2020 09 23;17(19).
    PMID: 32977611 DOI: 10.3390/ijerph17196963
    The mortality rate of very preterm infants with birth weight <1500 g is as high as 15%. The survivors till discharge have a high incidence of significant morbidity, which includes necrotising enterocolitis (NEC), early-onset neonatal sepsis (EONS) and late-onset neonatal sepsis (LONS). More than 25% of preterm births are associated with microbial invasion of amniotic cavity. The preterm gut microbiome subsequently undergoes an early disruption before achieving bacterial maturation. It is postulated that bacterial gut colonisation at birth and postnatal intestinal dysbacteriosis precede the development of NEC and LONS in very preterm infants. In fact, bacterial colonization patterns in preterm infants greatly differ from term infants due to maternal chorioamnionitis, gestational age, delivery method, feeding type, antibiotic exposure and the environment factor in neonatal intensive care unit (NICU). In this regard, this review provides an overview on the gut bacteria in preterm neonates' meconium and stool. More than 50% of preterm meconium contains bacteria and the proportion increases with lower gestational age. Researchers revealed that the gut bacterial diversity is reduced in preterm infants at risk for LONS and NEC. Nevertheless, the association between gut dysbacteriosis and NEC is inconclusive with regards to relative bacteria abundance and between-sample beta diversity indices. With most studies show a disruption of the Proteobacteria and Firmicutes preceding the NEC. Hence, this review sheds light on whether gut bacteria at birth either alone or in combination with postnatal gut dysbacteriosis are associated with mortality and the morbidity of LONS and NEC in very preterm infants.
    Matched MeSH terms: Gastrointestinal Microbiome*
  17. Fulltext Geography as non-genetic modulation factor of chicken cecal microbiota
    Pin Viso N, Redondo E, Díaz Carrasco JM, Redondo L, Sabio Y Garcia J, Fernández Miyakawa M, et al.
    PLoS One, 2021;16(1):e0244724.
    PMID: 33406150 DOI: 10.1371/journal.pone.0244724
    The gastrointestinal tract of chickens harbors a highly diverse microbiota contributing not only to nutrition, but also to the physiological development of the gastrointestinal tract. Microbiota composition depends on many factors such as the portion of the intestine as well as the diet, age, genotype, or geographical origin of birds. The aim of the present study was to demonstrate the influence of the geographical location over the cecal microbiota from broilers. We used metabarcoding sequencing datasets of the 16S rRNA gene publicly available to compare the composition of the Argentine microbiota against the microbiota of broilers from another seven countries (Germany, Australia, Croatia, Slovenia, United States of America, Hungary, and Malaysia). Geographical location played a dominant role in shaping chicken gut microbiota (Adonis R2 = 0.6325, P = 0.001; Mantel statistic r = 0.1524, P = 4e-04) over any other evaluated factor. The geographical origin particularly affected the relative abundance of the families Bacteroidaceae, Lactobacillaceae, Lachnospiraceae, Ruminococcaceae, and Clostridiaceae. Because of the evident divergence of microbiota among countries we coined the term "local microbiota" as convergent feature that conflates non-genetic factors, in the perspective of human-environmental geography. Local microbiota should be taken into consideration as a native overall threshold value for further appraisals when testing the production performance and performing correlation analysis of gut microbiota modulation against different kind of diet and/or management approaches. In this regard, we described the Argentine poultry cecal microbiota by means of samples both from experimental trials and commercial farms. Likewise, we were able to identify a core microbiota composed of 65 operational taxonomic units assigned to seven phyla and 38 families, with the four most abundant taxa belonging to Bacteroides genus, Rikenellaceae family, Clostridiales order, and Ruminococcaceae family.
    Matched MeSH terms: Gastrointestinal Microbiome/genetics*
  18. Effects of prebiotics on immune system and cytokine expression
    Shokryazdan P, Faseleh Jahromi M, Navidshad B, Liang JB
    Med Microbiol Immunol, 2017 Feb;206(1):1-9.
    PMID: 27704207 DOI: 10.1007/s00430-016-0481-y
    Nowadays, use of prebiotics as feed and food additives has received increasing interest because of the beneficial effects of prebiotics on the health of animals and humans. One of the beneficial effects of prebiotics is stimulation of immune system, which can be direct or indirect through increasing population of beneficial microbes or probiotics, especially lactic acid bacteria and bifidobacteria, in the gut. An important mechanism of action of probiotics and prebiotics, by which they can affect the immune system, is changing the expression of cytokines. The present review tried to summarize the findings of studies that investigated the effects of prebiotics on immune system with focusing on their effects on cytokine expression. Generally, most of reviewed studies indicated beneficial effects for prebiotics in terms of improving immune system, by increasing the expression of anti-inflammatory cytokines, while reducing the expressions of proinflammatory cytokines. However, most of studies mainly considered the indirect effects of prebiotics on the immune system (through changing the composition and population of gut microbiota), and their direct effects still need to be further studied using prebiotics with different degree of polymerization in different hosts.
    Matched MeSH terms: Gastrointestinal Microbiome/drug effects*
  19. Effects of Potential Probiotic Strains on the Fecal Microbiota and Metabolites of D-Galactose-Induced Aging Rats Fed with High-Fat Diet
    Lew LC, Hor YY, Jaafar MH, Lau AS, Khoo BY, Sasidharan S, et al.
    Probiotics Antimicrob Proteins, 2020 06;12(2):545-562.
    PMID: 31301059 DOI: 10.1007/s12602-019-09545-6
    Both aging and diet play an important role in influencing the gut ecosystem. Using premature senescent rats induced by D-galactose and fed with high-fat diet, this study aims to investigate the effects of different potential probiotic strains on the dynamic changes of fecal microbiome and metabolites. In this study, male Sprague-Dawley rats were fed with high-fat diet and injected with D-galactose for 12 weeks to induce aging. The effect of Lactobacillus plantarum DR7, L. fermentum DR9, and L. reuteri 8513d administration on the fecal microbiota profile, short-chain fatty acids, and water-soluble compounds were analyzed. It was found that the administration of the selected strains altered the gut microbiota diversity and composition, even at the phylum level. The fecal short-chain fatty acid content was also higher in groups that were administered with the potential probiotic strains. Analysis of the fecal water-soluble metabolites revealed that administration of L. plantarum DR7 and L. reuteri 8513d led to higher fecal content of compounds related to amino acid metabolism such as tryptophan, leucine, tyrosine, cysteine, methionine, valine, and lysine; while administration of L. fermentum DR9 led to higher prevalence of compounds related to carbohydrate metabolism such as erythritol, xylitol, and arabitol. In conclusion, it was observed that different strains of lactobacilli can cause difference alteration in the gut microbiota and the metabolites, suggesting the urgency to explore the specific metabolic impact of specific strains on the host.
    Matched MeSH terms: Gastrointestinal Microbiome*
  20. In vitro characteristics of an Atlantic salmon (Salmo salar L.) hind gut microbial community in relation to different dietary treatments
    Zarkasi KZ, Taylor RS, Glencross BD, Abell GCJ, Tamplin ML, Bowman JP
    Res. Microbiol., 2017 Oct;168(8):751-759.
    PMID: 28728852 DOI: 10.1016/j.resmic.2017.07.003
    In this study, microbial community dynamics were assessed within a simple in vitro model system in order to understand those changes influenced by diet. The abundance and diversity of bacteria were monitored within different treatment slurries inoculated with salmon faecal samples in order to mimic the effects of dietary variables. A total of five complete diets and two ingredients (plant meal) were tested. The total viable counts (TVCs) and sequencing data revealed that there was very clear separation between the complete diets and the plant meal treatments, suggesting a dynamic response by the allochthonous bacteria to the treatments. Automated ribosomal intergenic spacer analysis (ARISA) results showed that different diet formulations produced different patterns of fragments, with no separation between the complete diets. However, plant-based protein ingredients were clearly separated from the other treatments. 16S rRNA Illumina-based sequencing analysis showed that members of the genera Aliivibrio, Vibrio and Photobacterium became predominant for all complete diets treatments. The plant-based protein ingredient treatments only sustained weak growth of the genus Sphingomonas. In vitro based testing of diets could be a useful strategy to determine the potential impact of either complete feeds or ingredients on major fish gastrointestinal tract microbiome members.
    Matched MeSH terms: Gastrointestinal Microbiome*
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