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https://www.readbyqxmd.com/read/28540921/the-path-towards-microbiome-based-metabolite-treatment
#1
Jotham Suez, Eran Elinav
The increasing evidence pointing towards the involvement of the gut microbiome in multiple diseases, as well as its plasticity, renders it a desirable potential therapeutic target. Nevertheless, classical therapies based on the consumption of live probiotic bacteria, or their enrichment by prebiotics, exhibit limited efficacy. Recently, a novel therapeutic approach has been suggested based on metabolites secreted, modulated or degraded by the microbiome. As many of the host-microorganism interactions pertaining to human health are mediated by metabolites, this approach may be able to provide therapeutic efficacy while overcoming caveats of current microbiome-targeting therapies, such as colonization resistance and inter-individual variation in microbial composition...
May 25, 2017: Nature Microbiology
https://www.readbyqxmd.com/read/28538097/biochemical-characterization-of-the-functional-roles-of-residues-in-the-active-site-of-the-%C3%AE-galactosidase-from-bacillus-circulans-atcc-31382
#2
Huifang Yin, Tjaard Pijning, Xiangfeng Meng, Lubbert Dijkhuizen, Sander Sebastiaan van Leeuwen
The β-galactosidase enzyme from Bacillus circulans ATCC 31382 BgaD is widely used in the food industry to produce prebiotic galactooligosaccharides (GOS). Recently, the crystal structure of a C-terminally truncated version of the enzyme (BgaD-D) has been elucidated. The roles of active site amino acid residues in β-galactosidase enzyme reaction and product specificity have remained unknown. Based on a structural alignment of the β-galactosidase enzymes BgaD-D from Bacillus circulans and BgaA from Streptococcus pneumoniae, and the complex of BgaA with LacNAc, we identified 8 active site amino acid residues (Arg185, Asp481, Lys487, Tyr511, Trp570, Trp593, Glu601, and Phe616) in BgaD-D...
May 24, 2017: Biochemistry
https://www.readbyqxmd.com/read/28537771/atmospheric-constraints-on-the-surface-uv-environment-of-mars-at-3-9%C3%A2-ga-relevant-to-prebiotic-chemistry
#3
Sukrit Ranjan, Robin Wordsworth, Dimitar D Sasselov
Recent findings suggest that Mars may have been a clement environment for the emergence of life and may even have compared favorably to Earth in this regard. These findings have revived interest in the hypothesis that prebiotically important molecules or even nascent life may have formed on Mars and been transferred to Earth. UV light plays a key role in prebiotic chemistry. Characterizing the early martian surface UV environment is key to understanding how Mars compares to Earth as a venue for prebiotic chemistry...
May 24, 2017: Astrobiology
https://www.readbyqxmd.com/read/28535609/synthesis-of-%C3%AE-galactooligosaccharide-using-bifidobacterial-%C3%AE-galactosidase-purified-from-recombinant-escherichia-coli
#4
So Young Oh, So Youn Youn, Myung Soo Park, Hyoung Geun Kim, Nam In Baek, Zhi Peng Li, Geun Eog Ji
Galactooligosaccharides (GOS) are known to be selectively utilized by Bifidobacterium, which can bring about healthy changes of the composition of intestinal microflora. In this study, β-GOS are synthesized using bifidobacterial β-galactosidase(G1) purified from recombinant E. coli with a high GOS yield and with high productivity and enhanced bifidogenic activity. The purified recombinant G1 showed maximum production of β-GOS at pH 8.5 and 45°C. A matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF MS) analysis of the major peaks of the produced β-GOS showed MW of 527 and 689, indicating the synthesis of β-GOS at degrees of polymerization (DP) of 3 and DP4, respectively...
May 24, 2017: Journal of Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28535012/neokestose-suppresses-the-growth-of-human-melanoma-a2058-cells-via-inhibition-of-the-nuclear-factor%C3%A2-%C3%AE%C2%BAb-signaling-pathway
#5
Jiann-Shing Wu, Jan-Yi Chang, C Will Chen, Ming-Tse Lin, Dey-Chyi Sheu, Shun-Mei Lee
Neokestose has superior prebiotic effects compared with the commercial fructooligosaccharides (FOS). In addition, the branched structure of neokestose, a type of neo‑FOS, confers improved chemical stability compared with conventional FOS; therefore, the investigation of the branched structure by the present study may be of high biomedical value. The present study aimed to determine whether neokestose may suppress growth of the A2058 melanoma cell line. The cells were initially treated with neokestose; subsequently, in vitro cytotoxicity was assessed using MTT, and cell cycle progression and apoptosis were detected using flow cytometry...
May 17, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28533902/the-influence-of-in-ovo-injection-with-the-prebiotic-dinovo%C3%A2-on-the-development-of-histomorphological-parameters-of-the-duodenum-body-mass-and-productivity-in-large-scale-poultry-production-conditions
#6
Adrianna Sobolewska, Gabriela Elminowska-Wenda, Joanna Bogucka, Agata Dankowiakowska, Anna Kułakowska, Agata Szczerba, Katarzyna Stadnicka, Michał Szpinda, Marek Bednarczyk
BACKGROUND: Among various feed additives currently used in poultry nutrition, an important role is played by bioactive substances, including prebiotics. The beneficial effect of these bioactive substances on the gastrointestinal tract and immune system give rise to improvements in broiler health and performance nutrition, thus increasing the productivity of these birds. An innovative method for introducing bioactive substances into chickens is the in ovo injection into eggs intended for hatching...
2017: Journal of Animal Science and Biotechnology
https://www.readbyqxmd.com/read/28533178/mucin-and-carbohydrate-stimulated-adhesion-and-subproteome-changes-of-the-probiotic-bacterium-lactobacillus-acidophilus-ncfm
#7
Hasan Ufuk Celebioglu, Sita Vaag Olesen, Kennie Prehn, Sampo J Lahtinen, Susanne Brix, Maher Abou Hachem, Birte Svensson
Adhesion to intestinal mucosa is a crucial property for probiotic bacteria. Adhesion is thought to increase host-bacterial interactions, thus potentially enabling health benefits to the host. Molecular events connected with adhesion and surface proteome changes were investigated for the probiotic Lactobacillus acidophilus NCFM cultured with established or emerging prebiotic carbohydrates as carbon source and in the presence of mucin, the glycoprotein of the epithelial mucus layer. Variation in adhesion to HT29-cells and mucin was associated with carbon source and mucin-induced subproteome abundancy differences...
May 19, 2017: Journal of Proteomics
https://www.readbyqxmd.com/read/28527946/the-microbiome-and-hepatobiliary-pancreatic-cancers
#8
Kosuke Mima, Shigeki Nakagawa, Hiroshi Sawayama, Takatsugu Ishimoto, Katsunori Imai, Masaaki Iwatsuki, Daisuke Hashimoto, Yoshifumi Baba, Yo-Ichi Yamashita, Naoya Yoshida, Akira Chikamoto, Hideo Baba
The human intestinal microbiome encompasses at least 100 trillion microorganisms that can influence host immunity and disease conditions, including cancer. Hepatobiliary and pancreatic cancers have been associated with poor prognosis owing to their high level of tumor invasiveness, distant metastasis, and resistance to conventional treatment options, such as chemotherapy. Accumulating evidence from animal models suggests that specific microbes and microbial dysbiosis can potentiate hepatobiliary-pancreatic tumor development by damaging DNA, activating oncogenic signaling pathways, and producing tumor-promoting metabolites...
May 17, 2017: Cancer Letters
https://www.readbyqxmd.com/read/28527509/impact-of-qi-invigorating-traditional-chinese-medicines-on-intestinal-flora-a-basis-for-rational-choice-of-prebiotics
#9
REVIEW
Xiao-Meng Wang, Xiao-Bo Li, Ying Peng
According to the theory of traditional Chinese medicine (TCM), Qi (vital energy) is regarded as a driving force of biological activities in human body, including both nutrient substances and organ functions. Qi-invigorating TCMs are widely used to treat various symptoms and disorders, such as fatigue, obesity, immunosuppression, intestinal flora imbalance, and gastrointestinal diseases, in which Qi is considered to be reduced or depleted. Interestingly, abundant clinical evidences suggest that these disorders are associated with the alternation of intestinal flora, which directly affects disease status...
April 2017: Chinese Journal of Natural Medicines
https://www.readbyqxmd.com/read/28526852/health-benefit-of-vegetable-fruit-juice-based-diet-role-of-microbiome
#10
Susanne M Henning, Jieping Yang, Paul Shao, Ru-Po Lee, Jianjun Huang, Austin Ly, Mark Hsu, Qing-Yi Lu, Gail Thames, David Heber, Zhaoping Li
The gut microbiota is an important contributor to human health. Vegetable/fruit juices provide polyphenols, oligosaccharides, fiber and nitrate (beet juice), which may induce a prebiotic-like effect. Juice-based diets are becoming popular. However, there is a lack of scientific evidence of their health benefits. It was our hypothesis that changes in the intestinal microbiota induced by a juice-based diet play an important role in their health benefits. Twenty healthy adults consumed only vegetable/fruit juices for 3 days followed by 14 days of customary diet...
May 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28524845/divergent-prebiotic-synthesis-of-pyrimidine-and-8-oxo-purine-ribonucleotides
#11
Shaun Stairs, Arif Nikmal, Dejan-Krešimir Bučar, Shao-Liang Zheng, Jack W Szostak, Matthew W Powner
Understanding prebiotic nucleotide synthesis is a long standing challenge thought to be essential to elucidating the origins of life on Earth. Recently, remarkable progress has been made, but to date all proposed syntheses account separately for the pyrimidine and purine ribonucleotides; no divergent synthesis from common precursors has been proposed. Moreover, the prebiotic syntheses of pyrimidine and purine nucleotides that have been demonstrated operate under mutually incompatible conditions. Here, we tackle this mutual incompatibility by recognizing that the 8-oxo-purines share an underlying generational parity with the pyrimidine nucleotides...
May 19, 2017: Nature Communications
https://www.readbyqxmd.com/read/28524627/weight-loss-interventions-and-gut-microbiota-changes-in-overweight-and-obese-patients-a-systematic-review
#12
REVIEW
F B Seganfredo, C A Blume, M Moehlecke, A Giongo, D S Casagrande, J V N Spolidoro, A V Padoin, B D Schaan, C C Mottin
Imbalances in the gut microbiota, the bacteria that inhabit the intestines, are central to the pathogenesis of obesity. This systematic review assesses the association between the gut microbiota and weight loss in overweight/obese adults and its potential manipulation as a target for treating obesity. This review identified 43 studies using the keywords 'overweight' or 'obesity' and 'microbiota' and related terms; among these studies, 17 used dietary interventions, 11 used bariatric surgery and 15 used microbiota manipulation...
May 19, 2017: Obesity Reviews: An Official Journal of the International Association for the Study of Obesity
https://www.readbyqxmd.com/read/28521711/mini-heme-proteins-designability-of-structure-and-diversity-of-functions
#13
Jagdish Rai
Natural heme proteins may have heme bound to poly-peptide chain as a cofactor via non-covalent forces or heme as a prosthetic group may be covalently bound to the proteins. Nature has used porphyrins in diverse functions like electron transfer, oxidation, reduction, ligand binding, photosynthesis, signaling, etc. by modulating its properties through diverse protein matrices. Synthetic chemists have tried to utilize these molecules in equally diverse industrial and medical applications due to their versatile electro-chemical and optical properties...
May 15, 2017: Current Protein & Peptide Science
https://www.readbyqxmd.com/read/28521317/mechanisms-of-tolerance-induction
#14
Anna Nowak-Węgrzyn, Pantipa Chatchatee
Food allergy results from failure in oral tolerance that usually occurs in infancy or early childhood. Exposure to peanut and hen's egg via the inflamed and disrupted epithelial barrier in children with severe atopic dermatitis is a risk factor for the development of allergy to these foods and supports the hypothesis that epicutaneous exposure in the absence of oral feeding is an important pathway of allergic IgE sensitization in infants. In recent years, the collective evidence has pointed toward the protective effect of an early feeding with peanut and egg in children with eczema, taking advantage of the pathways underlying oral tolerance to counteract epicutaneous exposure...
2017: Annals of Nutrition & Metabolism
https://www.readbyqxmd.com/read/28514886/physiological-effects-of-prebiotics-and-its-role-in-prevention-of-necrotizing-enterocolitis-in-preterm-neonates
#15
Bhawan Deep Garg, Haribalakrishna Balasubramanian, Nandkishor S Kabra
Necrotizing enterocolitis (NEC) is one of the most serious gastrointestinal emergencies in very low birth weight (VLBW) preterm neonates, affecting 7% to 14% of these neonates. Due to seriousness of disease, prevention of NEC is the most important goal. Current evidence from systematic review and meta-analysis revealed probiotics are the most promising intervention in reduction of the incidence of NEC in VLBW neonates. As per the evidence, prebiotics modulate the composition of human intestine microflora to the benefit of the host by suppression of colonization of harmful microorganism and/or the stimulation of bifidobacterial growth, decreased stool viscosity, reduced gastrointestinal transit time and better feed tolerance...
May 17, 2017: Journal of Maternal-fetal & Neonatal Medicine
https://www.readbyqxmd.com/read/28507766/effect-of-dietary-mannanoligosaccharide-supplementation-on-nutrient-digestibility-hindgut-fermentation-immune-response-and-antioxidant-indices-in-dogs
#16
Mahesh M Pawar, Ashok K Pattanaik, Dharmendra K Sinha, Tapas K Goswami, Kusumakar Sharma
BACKGROUND: Use of prebiotics in companion animal nutrition is often considered advantageous over probiotics because of the ease of handling, ability to withstand processing and storage etc. While most of the studies on prebiotic use in dogs have been done with processed food as basal diet, the response in relation to homemade diet feeding is not very well explored. METHODS: The study was conducted to evaluate the effects of dietary mannanoligosaccharide (MOS) supplementation on nutrient digestibility, hindgut fermentation, immune response and antioxidant indices in dogs...
2017: Journal of Animal Science and Technology
https://www.readbyqxmd.com/read/28507716/chemistry-in-nanoconfined-water
#17
Daniel Muñoz-Santiburcio, Dominik Marx
Nanoconfined liquids have extremely different properties from the bulk, which profoundly affects chemical reactions taking place in nanosolvation. Here, we present extensive ab initio simulations of a vast set of chemical reactions within a water lamella that is nanoconfined by mineral surfaces, which might be relevant to prebiotic peptide formation in aqueous environments. Our results disclose a rich interplay of distinct effects, from steric factors typical of reactions occurring in small spaces to a charge-stabilization effect in nanoconfined water at extreme conditions similar to that observed in bulk water when changing from extreme to ambient conditions...
May 1, 2017: Chemical Science
https://www.readbyqxmd.com/read/28504479/contribution-of-anthocyanin-rich-foods-in-obesity-control-through-gut-microbiota-interactions
#18
REVIEW
Giovana Jamar, Débora Estadella, Luciana Pellegrini Pisani
Obesity is characterized by low-grade inflammation and a number of metabolic disorders. Distal gut microbes' content (microbiota) is not yet fully understood but evidence shows that it is influenced by internal and external factors that modulate its composition and function. The evidence that gut microbiota composition can differ between healthy and obese individuals, as well as for those who maintain specific dietary habits, has led to the study of this environmental factor as a key link between the pathophysiology of obesity and gut microbiota...
May 15, 2017: BioFactors
https://www.readbyqxmd.com/read/28504142/prebiotic-efficacy-and-mechanism-of-inulin-combined-with-inulin-degrading-lactobacillus-paracasei-i321-in-competition-with-salmonella
#19
Pochanart Kanjan, Tipparat Hongpattarakere
Inulin efficacy was proven for raising anti-Salmonella activity of the inulin-degrading Lactobacillus paracasei I321 (infant isolate) through the mechanisms of antibacterial secretion and competitive adhesion. Inulin significantly promoted competitive adhesion of L. paracasei I321 against many Gram-negative foodborne pathogenic bacteria. Salmonella Typhimurium SA2093 was completely suppressed under highly competitive niche of fecal microflora when inulin, L. paracasei I321, and their synbiotic combination were applied...
August 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28504130/bifidobacterial-growth-stimulation-by-oligosaccharides-generated-from-olive-tree-pruning-biomass
#20
Encarnación Ruiz, Beatriz Gullón, Patrícia Moura, Florbela Carvalheiro, Gemma Eibes, Cristóbal Cara, Eulogio Castro
This work aims to evaluate the prebiotic potential of oligosaccharides (OS) obtained from autohydrolysis of olive tree pruning biomass (OTPB). Two selected fractions (F1 and F2) were characterized and used in in vitro fermentations by two Bifidobacterium spp. (B. adolescentis and B. longum) and one fecal inoculum. The fraction F1 presented a lower average degree of polymerization (DP) mainly with OS ranging from 3 to 6 DP, whereas the fraction F2 corresponded to a pool of unsubstituted and acetylated oligomers with DP between 4 and 19...
August 1, 2017: Carbohydrate Polymers
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