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https://www.readbyqxmd.com/read/27905542/defining-an-olfactory-receptor-function-in-airway-smooth-muscle-cells
#1
William H Aisenberg, Jessie Huang, Wanqu Zhu, Premraj Rajkumar, Randy Cruz, Lakshmi Santhanam, Niranjana Natarajan, Hwan Mee Yong, Breann De Santiago, Jung Jin Oh, A-Rum Yoon, Reynold A Panettieri, Oliver Homann, John K Sullivan, Stephen B Liggett, Jennifer L Pluznick, Steven S An
Pathways that control, or can be exploited to alter, the increase in airway smooth muscle (ASM) mass and cellular remodeling that occur in asthma are not well defined. Here we report the expression of odorant receptors (ORs) belonging to the superfamily of G-protein coupled receptors (GPCRs), as well as the canonical olfaction machinery (Golf and AC3) in the smooth muscle of human bronchi. In primary cultures of isolated human ASM, we identified mRNA expression for multiple ORs. Strikingly, OR51E2 was the most highly enriched OR transcript mapped to the human olfactome in lung-resident cells...
December 1, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27904735/urinary-metabolomics-of-young-italian-autistic-children-supports-abnormal-tryptophan-and-purine-metabolism
#2
Federica Gevi, Lello Zolla, Stefano Gabriele, Antonio M Persico
BACKGROUND: Autism spectrum disorder (ASD) is still diagnosed through behavioral observation, due to a lack of laboratory biomarkers, which could greatly aid clinicians in providing earlier and more reliable diagnoses. Metabolomics on human biofluids provides a sensitive tool to identify metabolite profiles potentially usable as biomarkers for ASD. Initial metabolomic studies, analyzing urines and plasma of ASD and control individuals, suggested that autistic patients may share some metabolic abnormalities, despite several inconsistencies stemming from differences in technology, ethnicity, age range, and definition of "control" status...
2016: Molecular Autism
https://www.readbyqxmd.com/read/27900260/gut-microbiota-and-glucometabolic-alterations-in-response-to-recurrent-partial-sleep-deprivation-in-normal-weight-young-individuals
#3
Christian Benedict, Heike Vogel, Wenke Jonas, Anni Woting, Michael Blaut, Annette Schürmann, Jonathan Cedernaes
OBJECTIVE: Changes to the microbial community in the human gut have been proposed to promote metabolic disturbances that also occur after short periods of sleep loss (including insulin resistance). However, whether sleep loss affects the gut microbiota remains unknown. METHODS: In a randomized within-subject crossover study utilizing a standardized in-lab protocol (with fixed meal times and exercise schedules), we studied nine normal-weight men at two occasions: after two nights of partial sleep deprivation (PSD; sleep opportunity 02:45-07:00 h), and after two nights of normal sleep (NS; sleep opportunity 22:30-07:00 h)...
December 2016: Molecular Metabolism
https://www.readbyqxmd.com/read/27898428/beneficial-effects-of-a-dietary-weight-loss-intervention-on-human-gut-microbiome-diversity-and-metabolism-are-not-sustained-during-weight-maintenance
#4
Femke-Anouska Heinsen, Daniela Fangmann, Nike Müller, Dominik M Schulte, Malte C Rühlemann, Kathrin Türk, Ute Settgast, Wolfgang Lieb, John F Baines, Stefan Schreiber, Andre Franke, Matthias Laudes
OBJECTIVE: In the present study, we examined the effect of a very low-calorie diet(VLCD)-based obesity program on human gut microbiome diversity and metabolism during weight loss and weight maintenance. METHODS: Obese subjects underwent 3 months of VLCD followed by 3 months of weight maintenance. A lean and an obese control group were included. The microbiome was characterized by performing high-throughput dual-indexed 16S rDNA amplicon sequencing. RESULTS: At baseline, a significant difference in the Firmicutes/Bacteroidetes ratio between the lean and obese individuals was observed (p = 0...
November 30, 2016: Obesity Facts
https://www.readbyqxmd.com/read/27892954/a-purified-membrane-protein-from-akkermansia-muciniphila-or-the-pasteurized-bacterium-improves-metabolism-in-obese-and-diabetic-mice
#5
Hubert Plovier, Amandine Everard, Céline Druart, Clara Depommier, Matthias Van Hul, Lucie Geurts, Julien Chilloux, Noora Ottman, Thibaut Duparc, Laeticia Lichtenstein, Antonis Myridakis, Nathalie M Delzenne, Judith Klievink, Arnab Bhattacharjee, Kees C H van der Ark, Steven Aalvink, Laurent O Martinez, Marc-Emmanuel Dumas, Dominique Maiter, Audrey Loumaye, Michel P Hermans, Jean-Paul Thissen, Clara Belzer, Willem M de Vos, Patrice D Cani
Obesity and type 2 diabetes are associated with low-grade inflammation and specific changes in gut microbiota composition. We previously demonstrated that administration of Akkermansia muciniphila to mice prevents the development of obesity and associated complications. However, the underlying mechanisms of this protective effect remain unclear. Moreover, the sensitivity of A. muciniphila to oxygen and the presence of animal-derived compounds in its growth medium currently limit the development of translational approaches for human medicine...
November 28, 2016: Nature Medicine
https://www.readbyqxmd.com/read/27891552/enteric-glial-cells-are-susceptible-to-clostridium-difficile-toxin-b
#6
Katia Fettucciari, Pamela Ponsini, Davide Gioè, Lara Macchioni, Camilla Palumbo, Elisabetta Antonelli, Stefano Coaccioli, Vincenzo Villanacci, Lanfranco Corazzi, Pierfrancesco Marconi, Gabrio Bassotti
Clostridium difficile causes nosocomial/antibiotic-associated diarrhoea and pseudomembranous colitis. The major virulence factors are toxin A and toxin B (TcdB), which inactivate GTPases by monoglucosylation, leading to cytopathic (cytoskeleton alteration, cell rounding) and cytotoxic effects (cell-cycle arrest, apoptosis). C. difficile toxins breaching the intestinal epithelial barrier can act on underlying cells, enterocytes, colonocytes, and enteric neurons, as described in vitro and in vivo, but until now no data have been available on enteric glial cell (EGC) susceptibility...
November 28, 2016: Cellular and Molecular Life Sciences: CMLS
https://www.readbyqxmd.com/read/27890791/fecal-microbiota-manipulation-prevents-dysbiosis-and-alcohol-induced-liver-injury-in-mice
#7
Gladys Ferrere, Laura Wrzosek, Frédéric Cailleux, Williams Turpin, Virginie Puchois, Madeleine Spatz, Dragos Ciocan, Dominique Rainteau, Lydie Humbert, Cindy Hugot, Françoise Gaudin, Marie-Louise Noordine, Véronique Robert, Dominique Berrebi, Muriel Thomas, Sylvie Naveau, Gabriel Perlemuter, Anne-Marie Cassard
BACKGROUND AND AIMS: Alcoholic liver disease (ALD) is a leading cause of liver failure and mortality. In humans, severe alcoholic hepatitis is associated with key changes of intestinal microbiota (IM), which influences individual sensitivity to develop advanced ALD. We used the different susceptibility to ALD observed in two distinct animal facilities to test the efficiency of two complementary strategies (fecal microbiota transplantation and prebiotic treatment) to reverse dysbiosis and prevent ALD...
November 24, 2016: Journal of Hepatology
https://www.readbyqxmd.com/read/27889451/diet-microbiota-interactions-mediate-global-epigenetic-programming-in-multiple-host-tissues
#8
Kimberly A Krautkramer, Julia H Kreznar, Kymberleigh A Romano, Eugenio I Vivas, Gregory A Barrett-Wilt, Mary E Rabaglia, Mark P Keller, Alan D Attie, Federico E Rey, John M Denu
Histone-modifying enzymes regulate transcription and are sensitive to availability of endogenous small-molecule metabolites, allowing chromatin to respond to changes in environment. The gut microbiota produces a myriad of metabolites that affect host physiology and susceptibility to disease; however, the underlying molecular events remain largely unknown. Here we demonstrate that microbial colonization regulates global histone acetylation and methylation in multiple host tissues in a diet-dependent manner: consumption of a "Western-type" diet prevents many of the microbiota-dependent chromatin changes that occur in a polysaccharide-rich diet...
November 17, 2016: Molecular Cell
https://www.readbyqxmd.com/read/27887954/the-short-chain-fatty-acid-sodium-butyrate-functions-as-a-regulator-of-the-skin-immune-system
#9
Agatha Schwarz, Anika Bruhs, Thomas Schwarz
There is evidence that gut commensal microbes affect the mucosal immune system via expansion of regulatory T cells (Treg) in the colon. This is mediated via short-chain fatty acids (SCFA), bacterial metabolites generated during fiber fermentation, which include butyrate, propionate and acetate. We postulated that SCFA produced by commensal skin bacteria may also activate resident skin Treg, the activity of which is diminished in certain inflammatory dermatoses. Sodium butyrate (SB) either injected s.c. or applied topically onto the ears of hapten-sensitized mice significantly reduced the contact hypersensitivity reaction...
November 22, 2016: Journal of Investigative Dermatology
https://www.readbyqxmd.com/read/27886644/oral-administration-with-diosgenin-enhances-the-induction-of-intestinal-t-helper-1-like-regulatory-t-cells-in-a-murine-model-of-food-allergy
#10
Chung-Hsiung Huang, Chia-Chi Wang, Yu-Jin Lin, Masatoshi Hori, Tong-Rong Jan
Although the development of T helper (Th)1-like regulatory T (Treg) cells under Th1 inflammatory conditions has been reported, the role of Th1-like Treg cells in Th2 allergic responses remains mostly unclear. We previously demonstrated that diosgenin, the major sapogenin contained in the Chinese yam, attenuated food allergy and augmented Th1 and Treg immune responses. In this study, we hypothesized that diosgenin may enhance the induction of Th1-like Treg cells in the gut of mice with food allergy. Ovalbumin (OVA)-sensitized BALB/c mice were gavaged daily with diosgenin and received repeatedly intragastric ovalbumin challenges to induce intestinal allergic responses...
November 22, 2016: International Immunopharmacology
https://www.readbyqxmd.com/read/27882059/intestinal-microbiota-as-an-alternative-therapeutic-target-for-epilepsy
#11
REVIEW
Jiaying Wu, Yuyu Zhang, Hongyu Yang, Yuefeng Rao, Jing Miao, Xiaoyang Lu
Epilepsy is one of the most widespread serious neurological disorders, and an aetiological explanation has not been fully identified. In recent decades, a growing body of evidence has highlighted the influential role of autoimmune mechanisms in the progression of epilepsy. The hygiene hypothesis draws people's attention to the association between gut microbes and the onset of multiple immune disorders. It is also believed that, in addition to influencing digestive system function, symbiotic microbiota can bidirectionally and reversibly impact the programming of extraintestinal pathogenic immune responses during autoimmunity...
2016: Canadian Journal of Infectious Diseases & Medical Microbiology
https://www.readbyqxmd.com/read/27876960/characterization-and-control-of-symbiotic-bacillus-cereus-isolated-from-the-mid-gut-of-anopheles-subpictus-grassi
#12
Priyanka Mukhopadhyay, Soumendranath Chatterjee
An investigation was done to find out the role of gut bacterium on the larval development and survival of Anopheles subpictus, the vector responsible for the transmission of malaria. An. subpictus mosquitoes breed exclusively in stagnant water, including shrimp/fish ponds with high nutrient level. One bacterial strain (CX2) was isolated from the midgut of late third instar of mosquito larvae. The bacterial isolate was sensitive to recommended doses of tetracyclin (30 µg/disc), doxycycline (30 µg/disc), kanamycin (30 µg/disc), gentamycin (10 µg/disc), streptomycin (10 µg/disc), vancomycin (30 µg/disc), ofloxacin (5 µg/disc), levofloxacin (5 µg/disc), gatifloxacin (10 µg/disc), but resistant to ampicillin (10 µg/disc)...
December 2016: Journal of Parasitic Diseases: Official Organ of the Indian Society for Parasitology
https://www.readbyqxmd.com/read/27874076/oligofructose-as-an-adjunct-in-treatment-of-diabetes-in-nod-mice
#13
Clement Chan, Colin M Hyslop, Vipul Shrivastava, Andrea Ochoa, Raylene A Reimer, Carol Huang
In type 1 diabetes, restoration of normoglycemia can be achieved if the autoimmune attack on beta cells ceases and insulin requirement is met by the residual beta cells. We hypothesize that an adjunctive therapy that reduces insulin demand by increasing insulin sensitivity will improve the efficacy of an immunotherapy in reversing diabetes. We tested the gut microbiota-modulating prebiotic, oligofructose (OFS), as the adjunctive therapy. We treated non-obese diabetic mice with an immunotherapy, monoclonal anti-CD3 antibody (aCD3), with or without concurrent dietary supplement of OFS...
November 22, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27864387/increased-trimethylamine-n-oxide-portends-high-mortality-risk-independent-of-glycemic-control-in-patients-with-type-2-diabetes-mellitus
#14
W H Wilson Tang, Zeneng Wang, Xinmin S Li, Yiying Fan, Daniel S Li, Yuping Wu, Stanley L Hazen
BACKGROUND: Recent studies show a mechanistic link between intestinal microbial metabolism of dietary phosphatidylcholine and coronary artery disease pathogenesis. Concentrations of a proatherogenic gut microbe-generated metabolite, trimethylamine N-oxide (TMAO), predict increased incident cardiovascular disease risks in multiple cohorts. TMAO concentrations are increased in patients with type 2 diabetes mellitus (T2DM), but their prognostic value and relation to glycemic control are unclear...
November 18, 2016: Clinical Chemistry
https://www.readbyqxmd.com/read/27862119/increased-expression-of-nerve-growth-factor-correlates-with-visceral-hypersensitivity-and-impaired-gut-barrier-function-in-diarrhoea-predominant-irritable-bowel-syndrome-a-preliminary-explorative-study
#15
X J Xu, Y L Zhang, L Liu, L Pan, S K Yao
BACKGROUND: Neural-immune-endocrine network mechanism has attracted increased attention in diarrhoea-predominant irritable bowel syndrome (IBS-D). Pre-clinical evidence indicates that nerve growth factor (NGF) mediates visceral hypersensitivity and gut barrier dysfunction, via interactions with mast cells and sensory nerve fibres. AIM: To explore the role of nerve growth factor, as well as mast cell-nerve growth factor-nerve interaction in IBS-D pathophysiology...
November 9, 2016: Alimentary Pharmacology & Therapeutics
https://www.readbyqxmd.com/read/27857173/endotoxemia-contributes-to-cd27-memory-b-cell-apoptosis-via-enhanced-sensitivity-to-fas-ligation-in-patients-with-cirrhosis
#16
Li-Yuan Chang, Yonghai Li, David E Kaplan
Peripheral CD27(+) memory B-cells become quantitatively reduced and dysfunctional in patients with cirrhosis through poorly characterized mechanisms. We hypothesized that the disappearance of CD27(+) memory B-cells results from enhanced sensitivity to apoptosis caused by exposure to gut microbial translocation products. Using isolated naïve and memory B-cells from patients with cirrhosis and age-matched controls, ex vivo and activation-induced sensitivity to Fas-mediated apoptosis was assessed under relevant experimental conditions...
November 18, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27853507/developing-food-allergy-a-potential-immunologic-pathway-linking-skin-barrier-to-gut
#17
REVIEW
Yui-Hsi Wang
Immunoglobulin E (IgE)-mediated food allergy is an adverse reaction to foods and is driven by uncontrolled type-2 immune responses. Current knowledge cannot explain why only some individuals among those with food allergy are prone to develop life-threatening anaphylaxis. It is increasingly evident that the immunologic mechanisms involved in developing IgE-mediated food allergy are far more complex than allergic sensitization. Clinical observations suggest that patients who develop severe allergic reactions to food are often sensitized through the skin in early infancy...
2016: F1000Research
https://www.readbyqxmd.com/read/27852116/non-coeliac-gluten-wheat-sensitivity-advances-in-knowledge-and-relevant-questions
#18
Umberto Volta, Giacomo Caio, Tennekoon B Karunaratne, Armin Alaedini, Roberto De Giorgio
Non-coeliac gluten/wheat sensitivity (NCG/WS) is a syndrome characterized by intestinal and extra-intestinal symptoms occurring a few hours or days after the ingestion of gluten and wheat proteins in patients testing negative for coeliac disease and wheat allergy. Areas covered: The present review deals with recent scientific acquisitions of this gluten-related syndrome, including pathogenetic mechanisms, clinical picture, symptom score, biomarkers and double-blind placebo-controlled trial for diagnosis, and treatment...
November 23, 2016: Expert Review of Gastroenterology & Hepatology
https://www.readbyqxmd.com/read/27846295/a-microbiological-map-of-the-healthy-equine-gastrointestinal-tract
#19
Aaron C Ericsson, Philip J Johnson, Marco A Lopes, Sonja C Perry, Hannah R Lanter
Horses are exquisitely sensitive to non-specific gastrointestinal disturbances as well as systemic and extraintestinal conditions related to gut health, yet minimal data are available regarding the composition of the microbiota present in the equine stomach, small intestine, and cecum and their relation to fecal microbiota. Moreover, there is minimal information regarding the concordance of the luminal and mucosal microbial communities throughout the equine gut. Illumina-based 16S rRNA gene amplicon sequencing of the luminal and mucosal microbiota present in seven regions of the gastrointestinal tract of nine healthy adult horses revealed a distinct compositional divide between the small and large intestines...
2016: PloS One
https://www.readbyqxmd.com/read/27846067/detection-of-sepsis-in-preterm-infants-by-fecal-volatile-organic-compounds-analysis-a-proof-of-principle-study
#20
Daniel J C Berkhout, Hendrik J Niemarkt, Martin Buijck, Mirjam M van Weissenbruch, Paul Brinkman, Marc A Benninga, Anton H van Kaam, Boris W Kramer, Peter Andriessen, Nanne K H de Boer, Tim G J de Meij
OBJECTIVES: Several studies associated altered gut microbiota composition in preterm infants with late-onset sepsis (LOS), up to days prior to clinical onset of sepsis. However, microbiota analysis as early diagnostic biomarker is in clinical practice currently not feasible because of logistic aspects and high costs. Therefore, we hypothesized that analysis of fecal volatile organic compounds (VOC) may serve as non-invasive biomarker to predict LOS at a preclinical stage, since VOC reflect the composition and activity of intestinal microbial communities...
November 14, 2016: Journal of Pediatric Gastroenterology and Nutrition
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