Bioscience of Microbiota, Food and Health
Online ISSN : 2186-3342
Advance online publication
Showing 1-10 articles out of 10 articles from Advance online publication
  • Yohei SAKAI, Nobuo SEKI, Hirokazu HAMANO, Hiroshi OCHI, Fumiaki ABE, F ...
    Type: Note
    Article ID: 18-013
    Published: 2018
    [Advance publication] Released: December 29, 2018
    JOURNALS FREE ACCESS ADVANCE PUBLICATION

    To investigate the prebiotic effect of lactulose at low dosages, we assessed changes in defaecation frequency following ingestion of 1, 2, or 3 g/day of lactulose for 2 weeks. Each test was carried out after a 2-week washout period. This was an open-label, before-after trial that enrolled 26 healthy Japanese women. The defaecation frequency, number of defaecation days, and number of faecal bifidobacteria increased significantly compared with before ingestion of 1, 2, and 3 g/day of lactulose. These results suggest that even 1 g/day of lactulose could have a prebiotic effect.

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  • Muhammed DUMAN, Izzet Burcin SATICIOGLU, Soner ALTUN
    Type: Full Paper
    Article ID: 18-007
    Published: 2018
    [Advance publication] Released: December 07, 2018
    JOURNALS FREE ACCESS ADVANCE PUBLICATION

    Fecal contaminants are a major public concern that directly affect human health in the fish production industry. In this study, we aimed to determine the fecal coliform, spoilage bacteria, and antimicrobial-resistant bacterial contamination in rainbow trout (Oncorhynchus mykiss) farms. Fish were sampled from rainbow trout farms that have a high production capacity and are established on spring water, stream water, and dammed lakes in six different regions of Turkey. A total of seven Enterobacter subspecies, two strains of Pseudomonas spp., and one isolate each of Morganella and Stenotrophomonas were characterized based on biochemical and molecular methods, including the 16S rRNA and gyrB housekeeping gene regions. The sequencing results obtained from the 16S rRNA and gyrB gene regions were deposited in the GenBank database and compared with isolates from different countries, which were registered in the database. Resistance to 10 different antimicrobial compounds was determined using the broth microdilution method, and molecular resistance genes against florfenicol, tetracycline, and sulfamethoxazole were identified by PCR. All detected resistance genes were confirmed by sequencing analyses. E. cloacae, E. asburiae, Pseudomonas spp., S. maltophilia, and M. psychrotolerans were identified using the gyrB housekeeping gene, while isolates showed different biochemical characteristics. All isolates were found to be phenotypically resistant to sulfamethoxazole, and some isolates were resistant to tetracycline, florfenicol, amoxicillin, and doxycycline; the resistance genes of these isolates included floR, tetC, tetD, and tetE. We showed that fecal coliforms, spoilage bacteria, and antimicrobial resistant bacteria were present in farmed rainbow trout, and they pose a threat for human health and must be controlled in the farming stage of fish production.

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  • Yutaka MAKIZAKI, Ayako MAEDA, Yosuke OIKAWA, Saya TAMURA, Yoshiki TANA ...
    Type: Full Paper
    Article ID: 18-020
    Published: 2018
    [Advance publication] Released: December 07, 2018
    JOURNALS FREE ACCESS ADVANCE PUBLICATION

    Constipation, a functional disorder of the digestive system, is common in children and adults and may compromise patient quality of life. Because many patients are not satisfied with the efficacy of existing therapies, in this study, we investigated the efficacy of the probiotic Bifidobacterium bifidum G9-1 (BBG9-1) in constipation induced by a low-fiber diet. After inducing constipation in rats by feeding a low-fiber diet, rats were fed a low-fiber diet mixed with BBG9-1 in 14 days to determine the efficacy of BBG9-1 for alleviating constipation. BBG9-1 significantly alleviated the dysbiosis induced by a low-fiber diet and improved the fecal counts, fecal weights, and fecal water contents. Moreover, it also improved organic acid concentrations in the cecal contents. These results suggested that in low-fiber diet-induced constipation, BBG9-1 could alleviate dysbiosis and constipation and may improve the intestinal environment, supporting its potential application in the treatment of constipation.

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  • Yuji OHASHI, Tomohiko FUJISAWA
    Type: Note
    Article ID: 18-023
    Published: 2018
    [Advance publication] Released: December 07, 2018
    JOURNALS FREE ACCESS ADVANCE PUBLICATION

    Six species and one group of Clostridium cluster XI, Clostridium sordellii, Clostridium bifermentans, Clostridium difficile, Clostridium hiranonis, Intestinibacter bartlettii, and Romboutsia lituseburensis and the Terrisporobacter glycolicus group, respectively, in human feces collected from 18 healthy adults were analyzed with real-time PCR. Although individual differences were recognized, the predominant colonization of C. sordellii and I. bartlettii in the human large intestine was identified.

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  • Shino YAMASAKI-YASHIKI, Yuki MIYOSHI, Tomoya NAKAYAMA, Jun KUNISAWA, Y ...
    Type: Full Paper
    Article ID: 18-015
    Published: 2018
    [Advance publication] Released: November 01, 2018
    JOURNALS FREE ACCESS ADVANCE PUBLICATION

    Immunoglobulin (Ig) A in the mucous of the intestinal tract plays an important role in preventing the invasion of pathogenic microorganisms and regulating the composition of the gut microbiota. Several strains of probiotic lactic acid bacteria (LAB) are known to promote intestinal IgA production. Bacteria are also known to naturally release spherical membrane vesicles (MVs) that are involved in various biological functions such as quorum sensing, pathogenesis, and host immunomodulation. However, the production of MVs by LAB and their effects on host immunity remain poorly understood. In this study, we investigated the MV production by Lactobacillus sakei subsp. sakei NBRC15893 isolated from kimoto, the traditional seed mash used for brewing sake. MVs were separated from the culture broth of L. sakei NBRC15893 through filtration and density gradient ultracentrifugation and were observed by transmission electron microscopy. The MVs showed a spherical morphology, with a diameter of 30–400 nm, and contained proteins and nucleic acids. In addition, both the LAB cells and purified MVs promoted IgA production by murine Peyer’s patch cells. This MV- and cell-induced IgA production was suppressed by neutralization of Toll-like receptor (TLR) 2, which recognizes cell wall components of gram-positive bacteria, using an anti-TLR2 antibody. Collectively, our results indicate that MVs released from L. sakei NBRC15893 enhance IgA production by activating host TLR2 signaling through its cell wall components. Thus, it is important to consider novel interactions between gut microbiota and hosts via MVs, and MVs derived from probiotic bacteria could have promising applications as safe adjuvants.

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  • İzzet ULKER, Hilal YILDIRAN
    Type: Full Paper
    Article ID: 18-018
    Published: 2018
    [Advance publication] Released: October 27, 2018
    JOURNALS FREE ACCESS ADVANCE PUBLICATION

    Obesity is a disease with a rapidly increasing prevalence all over the world in recent years. Genetic and environmental factors are involved in the etiology of obesity, and the effect of microbiota on obesity is becoming increasingly clear. Obesity treatment has various treatment modalities such as behavior modification, medical nutrition therapy, physical activity enhancement, and surgical intervention. When other treatment methods are not successful, bariatric surgery is usually resorted to as the treatment method. Some changes such as food choices, the level of hormones and enzymes due to anatomical changes, pH of the stomach, and microbiota are observed after bariatric surgery. Alteration in the microbiota composition after bariatric surgery has also been reported to be important in achieving body weight loss and preserving body weight loss.

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  • Masanori HORIE, Hiroaki SATO, Atsumi TADA, Sayaka NAKAMURA, Sakiko SUG ...
    Type: Full Paper
    Article ID: 18-005
    Published: 2018
    [Advance publication] Released: October 06, 2018
    JOURNALS FREE ACCESS ADVANCE PUBLICATION

    Properties of Lactobacillus plantarum group strains isolated from two kinds of Japanese post-fermented teas, Ishizuchi-kurocha and Awa-bancha, were compared. Although lactic acid bacteria isolated from the fermented teas were identified as L. plantarum via homology comparison of 16S ribosomal RNA gene sequences, classification of L. plantarum based on ribosomal proteins showed that the strains isolated from Ishizuchi-kurocha and Awa-bancha were different. According to classification by the ribosomal protein typing, Ishizuchi-kurocha–derived strains belong to the same group as L. plantarum subsp. plantarum JCM 1149T. Awa-bancha–derived strains were assigned to a different group. This pattern was also applicable to strains isolated more than 10 years ago. A further analysis based on recA and a dnaK gene showed that Awa-bancha-derived strains were closely related to L. pentosus. The interactions with cultured cells were different between strain JCM 1149T and the Ishizuchi-kurocha–derived strains. The Ishizuchi-kurocha–derivedstrains showed strong adhesion to Caco-2 cells. In contrast, strain JCM 1149T and the Awa-bancha–derived strains hardly adhered to Caco-2 cells. According to the ribosomal protein typing, sugar utilization, and interaction with Caco-2 cells, although these properties were dependent on the strain strictly speaking, the L. plantarum group strains in this study can be subdivided into two groups: (1) type strain JCM 1149T and Ishizuchi-kurocha–derived strains and (2) Awa-bancha–derived strains. A regionally unique microorganism may persist in each traditional fermented drink.

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  • Mustafa Ata AYDIN, Esra Piril AGIRBAS, Suleyman AYDIN
    Type: Letter to the editor
    Article ID: 18-019
    Published: 2018
    [Advance publication] Released: September 26, 2018
    JOURNALS FREE ACCESS ADVANCE PUBLICATION
  • Takahiko NAGAMINE, Yoshinobu MATSUMOTO, Masaru NAKAMURA
    Type: Note
    Article ID: 18-009
    Published: 2018
    [Advance publication] Released: August 30, 2018
    JOURNALS FREE ACCESS ADVANCE PUBLICATION

    The incidence of Clostridium difficile infection (CDI) is greater in elderly orthopedic patients. We conducted a retrospective case-control study by selecting elderly patients who underwent proximal femoral fracture surgery to investigate the effect of probiotics on CDI prevention. Cases were diagnosed with CDI by an enzyme-linked immunosorbent assay for C. difficile toxins using frozen stool specimens. The primary method of exposure was receipt of combination probiotics such as Streptococcus faecalis, Bacillus mesentericus, and Clostridium butyricum. The crude odds ratio between developing CDI and receiving combination probiotics was 0.074 (95% CI: 0.010–0.565; p=0.002). Adjunctive combination probiotics among elderly patients who undergo proximal femoral fracture surgery likely reduces the probability of CDI.

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  • Morihiko OYA, Yutaka TADANO, Yasuhiro TAKIHATA, Wakana MURAKAMI, Shige ...
    Type: Note
    Article ID: 18-016
    Published: 2018
    [Advance publication] Released: August 30, 2018
    JOURNALS FREE ACCESS ADVANCE PUBLICATION

    We aimed to determine whether the composition of the fecal microbiota changes under hyperbaric conditions. In this study, we collected fecal samples from 6 healthy divers at three points during deep diving training (before, 2.1 MPa, end). The frequency of Clostridium cluster XVIII tended to be increased after compression. The frequencies of Clostridium cluster IV and subcluster XIVa were inversely correlated with that of Bacteroides. The compositional changes in the fecal microbiota exhibited interindividual variability. These findings suggest that hyperbaric conditions affect the fecal microbiota.

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