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https://www.readbyqxmd.com/read/28434196/role-of-gut-microbiota-bile-acids-and-their-crosstalk-in-the-effects-of-bariatric-surgery-on-obesity-and-type-2-diabetes
#1
Haijun Liu, Cheng Hu, Xueli Zhang, Weiping Jia
Type 2 diabetes mellitus is becoming increasingly prevalent worldwide and has become one of the greatest threats to global health. Bariatric surgery was initially designed to achieve weight loss and subsequently was noted to induce improvements or remission of type 2 diabetes. Currently, these bariatric operations such as Roux-en-Y gastric bypass (RYGB) and sleeve gastrectomy (SG) are the most effective procedures for the treatment of obesity and type 2 diabetes mellitus worldwide. However, the specific mechanism mediating the beneficial effects of metabolic surgery has remained largely unknown...
April 23, 2017: Journal of Diabetes Investigation
https://www.readbyqxmd.com/read/28434033/the-gut-microbiome-as-a-target-for-prevention-and-treatment-of-hyperglycaemia-in-type-2-diabetes-from-current-human-evidence-to-future-possibilities
#2
REVIEW
Louise Brunkwall, Marju Orho-Melander
The totality of microbial genomes in the gut exceeds the size of the human genome, having around 500-fold more genes that importantly complement our coding potential. Microbial genes are essential for key metabolic processes, such as the breakdown of indigestible dietary fibres to short-chain fatty acids, biosynthesis of amino acids and vitamins, and production of neurotransmitters and hormones. During the last decade, evidence has accumulated to support a role for gut microbiota (analysed from faecal samples) in glycaemic control and type 2 diabetes...
April 22, 2017: Diabetologia
https://www.readbyqxmd.com/read/28433924/the-metabolic-fate-of-isotopically-labeled-trimethylamine-n-oxide-tmao-in-humans
#3
Siraphat Taesuwan, Clara E Cho, Olga V Malysheva, Erica Bender, Julia H King, Jian Yan, Anna E Thalacker-Mercer, Marie A Caudill
Trimethylamine-N-oxide (TMAO) is associated with chronic disease risk. However, little is known about the metabolic fate of dietary TMAO. This study sought to quantitatively elucidate the metabolic fate of orally consumed TMAO in humans. As part of a crossover feeding study, healthy young men (n=40) consumed 50-mg deuterium-labeled methyl d9-TMAO (d9-TMAO), and enrichments of TMAO and its derivatives were measured in blood for 6 h, urine and stool, as well as skeletal muscle in a subset of men (n=6). Plasma d9-TMAO was detected as early as 15 min, increased until 1 h and remained elevated through the 6-h period...
April 13, 2017: Journal of Nutritional Biochemistry
https://www.readbyqxmd.com/read/28433758/osteomicrobiology-the-influence-of-gut-microbiota-on-bone-in-health-and-disease
#4
Rheinallt M Jones, Jennifer G Mulle, Roberto Pacifici
No abstract text is available yet for this article.
April 19, 2017: Bone
https://www.readbyqxmd.com/read/28433712/common-phox2b-poly-alanine-contractions-impair-ret-gene-transcription-predisposing-to-hirschsprung-disease
#5
Eleonora Di Zanni, Annalisa Adamo, Elga Belligni, Margherita Lerone, Giuseppe Martucciello, Girolamo Mattioli, Alessio Pini Prato, Roberto Ravazzolo, Margherita Silengo, Tiziana Bachetti, Isabella Ceccherini
HSCR is a congenital disorder of the enteric nervous system, characterized by the absence of neurons along a variable length of the gut resulting from loss-of-function RET mutations. Congenital Central Hypoventilation Syndrome (CCHS) is a rare neurocristopathy characterized by impaired response to hypercapnia and hypoxemia caused by heterozygous mutations of the PHOX2B gene, mostly polyalanine (polyA) expansions but also missense, nonsense, and frameshift mutations, while polyA contractions are common in the population and believed neutral...
April 19, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28433688/vitamin-d-downregulates-the-il-23-receptor-pathway-in-human-mucosal-ilc3
#6
Viktoria Konya, Paulo Czarnewski, Marianne Forkel, Anna Rao, Efthymia Kokkinou, Eduardo J Villablanca, Sven Almer, Ulrik Lindforss, Danielle Friberg, Charlotte Höög, Peter Bergman, Jenny Mjösberg
BACKGROUND: Vitamin D deficiency is a risk factor for inflammatory bowel disease (IBD). The IL-23-driven tissue-resident ILC3 play essential roles in intestinal immunity, and targeting IL-23/12 is a promising approach in IBD therapy. OBJECTIVE: We set out to define the role of 1α,25-dihydroxy vitamin D3 (1,25D) in regulating functional responses of human mucosal ILC3 to IL-23 plus IL-1β stimulation. METHODS: Transcriptomes of sorted tonsil ILC3 were assessed by microarray analysis...
April 19, 2017: Journal of Allergy and Clinical Immunology
https://www.readbyqxmd.com/read/28433458/linking-the-biological-underpinnings-of-depression-role-of-mitochondria-interactions-with-melatonin-inflammation-sirtuins-tryptophan-catabolites-dna-repair-and-oxidative-and-nitrosative-stress-with-consequences-for-classification-and-cognition
#7
REVIEW
George Anderson
The pathophysiological underpinnings of neuroprogressive processes in recurrent major depressive disorder (rMDD) are reviewed. A wide array of biochemical processes underlie MDD presentations and their shift to a recurrent, neuroprogressive course, including: increased immune-inflammation, tryptophan catabolites (TRYCATs), mitochondrial dysfunction, aryl hydrocarbonn receptor activation, and oxidative and nitrosative stress (O&NS), as well as decreased sirtuins and melatonergic pathway activity. These biochemical changes may have their roots in central, systemic and/or peripheral sites, including in the gut, as well as in developmental processes, such as prenatal stressors and breastfeeding consequences...
April 19, 2017: Progress in Neuro-psychopharmacology & Biological Psychiatry
https://www.readbyqxmd.com/read/28432876/effect-of-pistachio-consumption-on-the-modulation-of-urinary-gut-microbiota-related-metabolites-in-prediabetic-subjects
#8
Pablo Hernández-Alonso, Daniel Cañueto, Simona Giardina, Jordi Salas-Salvadó, Nicolau Cañellas, Xavier Correig, Mònica Bulló
The specific nutritional composition of nuts could affect different metabolic pathways involved in a broad range of metabolic diseases. We therefore investigated whether chronic consumption of pistachio nuts modifies the urine metabolome in prediabetic subjects. We designed a randomized crossover clinical trial in 39 prediabetic subjects. They consumed a pistachio-supplemented diet (PD, 50% carbohydrates, 33% fat, including 57 g/d of pistachios daily) and a control diet (CD, 55% carbohydrates, 30% fat) for 4 months each, separated by a 2-week wash-out...
April 12, 2017: Journal of Nutritional Biochemistry
https://www.readbyqxmd.com/read/28432834/molecular-control-of-gut-formation-in-the-spider-parasteatoda-tepidariorum
#9
Natália Martins Feitosa, Matthias Pechmann, Evelyn E Schwager, Vitória Tobias-Santos, Alistair P McGregor, Wim G M Damen, Rodrigo Nunes da Fonseca
The development of a digestive system is an essential feature of bilaterians. Studies of the molecular control of gut formation in arthropods have been studied in detail in the fruit fly Drosophila melanogaster. However, little is known in other arthropods, especially in noninsect arthropods. To better understand the evolution of arthropod alimentary system, we investigate the molecular control of gut development in the spider Parasteatoda tepidariorum (Pt), the primary chelicerate model species for developmental studies...
April 22, 2017: Genesis: the Journal of Genetics and Development
https://www.readbyqxmd.com/read/28432400/-the-intestinal-microbiome-and-metabolic-diseases-from-obesity-to-diabetes-and-nonalcoholic-steatohepatitis
#10
S C Bischoff
BACKGROUND: The intestinal microbiome consists of about 10 million genes, many of which encode digestive enzymes. This explains why animal and human experiments revealed that the intestinal microbiome adapts to food intake and optimizes energy harvest from food. This function is considered beneficial in states of lack of food, but following overnutrition, it might support the development of obesity. OBJECTIVES: The relevance of the intestinal microbiome for the pathogenesis of obesity and associated metabolic diseases such as fatty liver disease and type 2 diabetes mellitus and for the clinical management of such diseases shall be discussed...
April 21, 2017: Der Internist
https://www.readbyqxmd.com/read/28432200/tissue-adaptation-implications-for-gut-immunity-and-tolerance
#11
REVIEW
Ana M C Faria, Bernardo S Reis, Daniel Mucida
Tissue adaptation is an intrinsic component of immune cell development, influencing both resistance to pathogens and tolerance. Chronically stimulated surfaces of the body, in particular the gut mucosa, are the major sites where immune cells traffic and reside. Their adaptation to these environments requires constant discrimination between natural stimulation coming from harmless microbiota and food, and pathogens that need to be cleared. This review will focus on the adaptation of lymphocytes to the gut mucosa, a highly specialized environment that can help us understand the plasticity of leukocytes arriving at various tissue sites and how tissue-related factors operate to shape immune cell fate and function...
April 21, 2017: Journal of Experimental Medicine
https://www.readbyqxmd.com/read/28432131/do-the-microbiota-influence-vaccines-and-protective-immunity-to-pathogens-if-so-is-there-potential-for-efficacious-microbiota-based-vaccines
#12
Dan R Littman
The gut-resident constituents of the microbiota protect the mucosa from invasive pathogens through engagement of both innate and adaptive branches of the immune system. They are also likely to provide systemic protection from pathogens, by enhancing host robustness and tolerance to the invasive microbes and by inducing immune responses that prevent their growth. These properties of commensal microbiota, particularly the capacity of some bacteria to induce diverse types of antigen-specific immune responses, raises the prospect that they could be deployed as vaccine vectors to generate effective local and systemic immunity to viral and bacterial pathogens...
April 21, 2017: Cold Spring Harbor Perspectives in Biology
https://www.readbyqxmd.com/read/28432108/-microbes-in-sport-the-potential-role-of-the-gut-microbiota-in-athlete-health-and-performance
#13
EDITORIAL
Alan Rankin, Ciara O'Donavon, Sharon M Madigan, Orla O'Sullivan, Paul D Cotter
No abstract text is available yet for this article.
May 2017: British Journal of Sports Medicine
https://www.readbyqxmd.com/read/28431945/in-vitro-fermentation-behaviors-of-fucosylated-chondroitin-sulfate-from-pearsonothuria-graeffei-by-human-gut-microflora
#14
Chao-Yang Wei, Ning-Bo Liao, Yu Zhang, Xing-Qian Ye, Shan Li, Ya-Qin Hu, Dong-Hong Liu, Robert J Linhardt, Xin Wang, Shi-Guo Chen
A fucosylated chondroitin sulfate (FCS-pg) with highly repeated structure from Pearsonothuria graeffei was subjected to a in vitro fermentation model to investigate its fermentability and effects on human gut microflora. High performance liquid chromatography (HPLC) measurement found FCS-pg can be fermented to short chain fatty acids (SCFAs) by gut microflora from partial human fecal samples. 16S rRNA gene-based polymerase chain reaction-based denaturing gradient gel electrophoresis (PCR-DGGE) profiling and real-time quantitative PCR analysis showed that FCS-pg mainly increased the proportions of Clostridium cluster XI, Bacteriodes prevotella group, Bifidobacterium genus, Clostridium cluster I and Clostridium cluster XIVab, whereas the numbers of the Enterobacteriaceae and Lactobacillus decreased...
April 18, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28431559/effects-of-whole-grain-rye-with-and-without-resistant-starch-type-2-supplementation-on-glucose-tolerance-gut-hormones-inflammation-and-appetite-regulation-in-an-11-14-5%C3%A2-hour-perspective-a-randomized-controlled-study-in-healthy-subjects
#15
Jonna C Sandberg, Inger M E Björck, Anne C Nilsson
BACKGROUND: The prevalence of obesity is increasing worldwide and prevention is needed. Whole grain has shown potential to lower the risk of obesity, cardiovascular disease and type 2 diabetes. One possible mechanism behind the benefits of whole grain is the gut fermentation of dietary fiber (DF), e.g. non-starch polysaccharides and resistant starch (RS), in whole grain. The purpose of the study is to investigate the effect of whole grain rye-based products on glucose- and appetite regulation...
April 21, 2017: Nutrition Journal
https://www.readbyqxmd.com/read/28431319/response-of-plasma-glucagon-like-peptide-2-to-feeding-pattern-and-intraruminal-administration-of-volatile-fatty-acids-in-sheep
#16
M Elsabagh, Y Inabu, T Obitsu, T Sugino
Glucagon-like peptide-2 (GLP-2), a gut peptide secreted by enteroendocrine L cells, has recently been identified as a key regulator of intestinal growth and absorptive function in ruminants. However, reports on GLP-2 secretion are few, and more information regarding its secretion dynamics is needed. In this study, two experiments were conducted to elucidate the daily rhythm of GLP-2 secretion in response to feeding regimen and to investigate the effect of volatile fatty acids (VFA) on GLP-2 release in sheep...
March 11, 2017: Domestic Animal Endocrinology
https://www.readbyqxmd.com/read/28431252/engineered-regulatory-systems-modulate-gene-expression-of-human-commensals-in-the-gut
#17
Bentley Lim, Michael Zimmermann, Natasha A Barry, Andrew L Goodman
The gut microbiota is implicated in numerous aspects of health and disease, but dissecting these connections is challenging because genetic tools for gut anaerobes are limited. Inducible promoters are particularly valuable tools because these platforms allow real-time analysis of the contribution of microbiome gene products to community assembly, host physiology, and disease. We developed a panel of tunable expression platforms for the prominent genus Bacteroides in which gene expression is controlled by a synthetic inducer...
April 20, 2017: Cell
https://www.readbyqxmd.com/read/28431251/tunable-expression-tools-enable-single-cell-strain-distinction-in-the-gut-microbiome
#18
Weston R Whitaker, Elizabeth Stanley Shepherd, Justin L Sonnenburg
Applying synthetic biology to engineer gut-resident microbes provides new avenues to investigate microbe-host interactions, perform diagnostics, and deliver therapeutics. Here, we describe a platform for engineering Bacteroides, the most abundant genus in the Western microbiota, which includes a process for high-throughput strain modification. We have identified a novel phage promoter and translational tuning strategy and achieved an unprecedented level of expression that enables imaging of fluorescent-protein-expressing Bacteroides stably colonizing the mouse gut...
April 20, 2017: Cell
https://www.readbyqxmd.com/read/28431245/host-microbe-co-metabolism-dictates-cancer-drug-efficacy-in-c-%C3%A2-elegans
#19
Timothy A Scott, Leonor M Quintaneiro, Povilas Norvaisas, Prudence P Lui, Matthew P Wilson, Kit-Yi Leung, Lucia Herrera-Dominguez, Sonia Sudiwala, Alberto Pessia, Peter T Clayton, Kevin Bryson, Vidya Velagapudi, Philippa B Mills, Athanasios Typas, Nicholas D E Greene, Filipe Cabreiro
Fluoropyrimidines are the first-line treatment for colorectal cancer, but their efficacy is highly variable between patients. We queried whether gut microbes, a known source of inter-individual variability, impacted drug efficacy. Combining two tractable genetic models, the bacterium E. coli and the nematode C. elegans, we performed three-way high-throughput screens that unraveled the complexity underlying host-microbe-drug interactions. We report that microbes can bolster or suppress the effects of fluoropyrimidines through metabolic drug interconversion involving bacterial vitamin B6, B9, and ribonucleotide metabolism...
April 20, 2017: Cell
https://www.readbyqxmd.com/read/28431222/principles-of-chemical-biology-from-magic-to-gut-fungi-via-plug-and-play-biosensors
#20
(no author information available yet)
This month: New MAGIC linking mitochondrial biology and proteostasis, split RNA polymerase based biosensors, and a role that fungi play in human gut microbiome.
April 20, 2017: Cell Chemical Biology
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