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Gut microbiome

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https://www.readbyqxmd.com/read/28214542/several-hpept1-transported-drugs-are-substrates-of-the-e-coli-proton-coupled-oligopeptide-transporter-ydgr
#1
Bala K Prabhala, Nanda G Aduri, Mazhar Iqbal, Moazur Rahman, Michael Gajhede, Paul R Hansen, Osman Mirza
Proton-dependent oligopeptide transporters (POTs) are secondary active transporters found in all kingdoms of life. POTs utilize the proton electrochemical gradient for the uptake of nutrient dipeptides and tripeptides. The human POT hPepT1 is known to transport a number of drugs. As part of ongoing studies on substrate specificities of POTs from E. coli, our aim in this study was to investigate whether bacterial POTs could also transport these drugs. For this, we selected the common orally administered drugs sulpiride, bestatin, valacyclovir, ampicillin and oseltamivir, that are all transported by hPepT1...
February 15, 2017: Research in Microbiology
https://www.readbyqxmd.com/read/28213609/gut-microbial-profile-is-altered-in-primary-biliary-cholangitis-and-partially-restored-after-udca-therapy
#2
Ruqi Tang, Yiran Wei, Yanmei Li, Weihua Chen, Haoyan Chen, Qixia Wang, Fan Yang, Qi Miao, Xiao Xiao, Haiyan Zhang, Min Lian, Xiang Jiang, Jun Zhang, Qin Cao, Zhuping Fan, Maoying Wu, Dekai Qiu, Jing-Yuan Fang, Aftab Ansari, M Eric Gershwin, Xiong Ma
OBJECTIVE: A close relationship between gut microbiota and some chronic liver disorders has recently been described. Herein, we systematically performed a comparative analysis of the gut microbiome in primary biliary cholangitis (PBC) and healthy controls. DESIGN: We first conducted a cross-sectional study of 60 ursodeoxycholic acid (UDCA) treatment-naïve patients with PBC and 80 matched healthy controls. Second, an independent cohort composed of 19 treatment-naïve patients and 34 controls was used to validate the results...
February 17, 2017: Gut
https://www.readbyqxmd.com/read/28211545/the-effect-of-gut-microbiome-on-tolerance-to-morphine-mediated-antinociception-in-mice
#3
Minho Kang, Ryan A Mischel, Sukhada Bhave, Essie Komla, Alvin Cho, Charity Huang, William L Dewey, Hamid I Akbarali
There is growing appreciation for the importance of gastrointestinal microbiota in many physiological and pathophysiological processes. While morphine and other narcotics are the most widely prescribed therapy for moderate to severe pain clinically, they have been noted to alter microbial composition and promote bacterial translocation to other tissues. Here we examined the pharmacodynamic properties of chronic morphine in mice following bacterial depletion with oral gavage of an antibiotic cocktail (ABX). ABX significantly reduced gut bacteria and prevented chronic morphine induced increases in gut permeability, colonic mucosal destruction, and colonic IL-1β expression...
February 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28211537/ambient-ultrafine-particle-ingestion-alters-gut-microbiota-in-association-with-increased-atherogenic-lipid-metabolites
#4
Rongsong Li, Jieping Yang, Arian Saffari, Jonathan Jacobs, Kyung In Baek, Greg Hough, Muriel H Larauche, Jianguo Ma, Nelson Jen, Nabila Moussaoui, Bill Zhou, Hanul Kang, Srinivasa Reddy, Susanne M Henning, Matthew J Campen, Joseph Pisegna, Zhaoping Li, Alan M Fogelman, Constantinos Sioutas, Mohamad Navab, Tzung K Hsiai
Ambient particulate matter (PM) exposure is associated with atherosclerosis and inflammatory bowel disease. Ultrafine particles (UFP, dp < 0.1-0.2 μm) are redox active components of PM. We hypothesized that orally ingested UFP promoted atherogenic lipid metabolites in both the intestine and plasma via altered gut microbiota composition. Low density lipoprotein receptor-null (Ldlr(-/-)) mice on a high-fat diet were orally administered with vehicle control or UFP (40 μg/mouse/day) for 3 days a week...
February 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28210979/the-skin-as-a-route-of-allergen-exposure-part-ii-allergens-and-role-of-the-microbiome-and-environmental-exposures
#5
REVIEW
George Knaysi, Anna R Smith, Jeffrey M Wilson, Julia A Wisniewski
PURPOSE OF REVIEW: This second part of the article aims to highlight recent contributions in the literature that enhance our understanding of the cutaneous immune response to allergen. RECENT FINDINGS: Several properties of allergens facilitate barrier disruption and cutaneous sensitization. There is a strong epidemiologic relationship between the microbiome, both the gut and skin, and atopic dermatitis (AD). The mechanisms connecting these two entities remain enigmatic; however, recent murine models show that commensal skin bacteria play an active role in supporting skin barrier homeostasis and defense against microbial penetration...
January 2017: Current Allergy and Asthma Reports
https://www.readbyqxmd.com/read/28210076/potential-role-of-the-gut-microbiota-in-synthetic-torpor-and-therapeutic-hypothermia
#6
REVIEW
Claudia Sisa, Silvia Turroni, Roberto Amici, Patrizia Brigidi, Marco Candela, Matteo Cerri
Therapeutic hypothermia is today used in several clinical settings, among them the gut related diseases that are influenced by ischemia/reperfusion injury. This perspective paved the way to the study of hibernation physiology, in natural hibernators, highlighting an unexpected importance of the gut microbial ecosystem in hibernation and torpor. In natural hibernators, intestinal microbes adaptively reorganize their structural configuration during torpor, and maintain a mutualistic configuration regardless of long periods of fasting and cold temperatures...
January 21, 2017: World Journal of Gastroenterology: WJG
https://www.readbyqxmd.com/read/28209760/glucoraphanin-ameliorates-obesity-and-insulin-resistance-through-adipose-tissue-browning-and-reduction-of-metabolic-endotoxemia-in-mice
#7
Naoto Nagata, Liang Xu, Susumu Kohno, Yusuke Ushida, Yudai Aoki, Ryohei Umeda, Nobuo Fuke, Fen Zhuge, Yinhua Ni, Mayumi Nagashimada, Chiaki Takahashi, Hiroyuki Suganuma, Shuichi Kaneko, Tsuguhito Ota
Low-grade sustained inflammation links obesity to insulin resistance and nonalcoholic fatty liver disease (NAFLD). However, therapeutic approaches to improve systemic energy balance and chronic inflammation in obesity are limited. Pharmacological activation of nuclear factor (erythroid-derived 2)-like 2 (Nrf2) alleviates obesity and insulin resistance in mice; however, Nrf2 inducers are not clinically available owing to safety concerns. Thus, we examined whether dietary glucoraphanin, a stable precursor of the Nrf2 inducer sulforaphane, ameliorates systemic energy balance, chronic inflammation, insulin resistance, and NAFLD in high-fat diet (HFD)-fed mice...
February 16, 2017: Diabetes
https://www.readbyqxmd.com/read/28207825/discovery-of-a-new-family-of-relaxases-in-firmicutes-bacteria
#8
Gayetri Ramachandran, Andrés Miguel-Arribas, David Abia, Praveen K Singh, Isidro Crespo, César Gago-Córdoba, Jian An Hao, Juan Roman Luque-Ortega, Carlos Alfonso, Ling J Wu, D Roeland Boer, Wilfried J J Meijer
Antibiotic resistance is a serious global problem. Antibiotic resistance genes (ARG), which are widespread in environmental bacteria, can be transferred to pathogenic bacteria via horizontal gene transfer (HGT). Gut microbiomes are especially apt for the emergence and dissemination of ARG. Conjugation is the HGT route that is predominantly responsible for the spread of ARG. Little is known about conjugative elements of Gram-positive bacteria, including those of the phylum Firmicutes, which are abundantly present in gut microbiomes...
February 2017: PLoS Genetics
https://www.readbyqxmd.com/read/28205371/integrating-gut-microbiota-immaturity-and-disease-discriminatory-taxa-to-diagnose-the-initiation-and-severity-of-shrimp-disease
#9
Jinbo Xiong, Jinyong Zhu, Wenfang Dai, Chunming Dong, Qiongfen Qiu, Chenghua Li
Increasing evidence has emerged a tight link among the gut microbiota, host age and health status. This osculating interplay impedes the definition of gut microbiome features associated with host health from that in developmental stages. Consequently, gut microbiota-based prediction of health status is promising yet not well established. Here we firstly tracked shrimp gut microbiota (N = 118) over an entire cycle of culture; shrimp either stayed healthy, or progressively transitioned into severe disease. The results showed that the gut microbiota were significantly distinct over shrimp developmental stages, and disease progression...
February 15, 2017: Environmental Microbiology
https://www.readbyqxmd.com/read/28202164/manipulating-the-gut-microbiome-to-decrease-uremic-toxins
#10
Rabi Yacoub, Christina M Wyatt
The uremic solute indoxyl sulfate has been associated with increased mortality and other adverse outcomes in patients with chronic kidney disease. In a recent study published in Cell Host & Microbe, Devlin et al. describe a novel approach to alter the production of indoxyl sulfate through manipulation of the gut microbiota. Although this approach is far from clinical application, it may allow investigators to determine the contribution of uremic solutes to disease pathogenesis.
March 2017: Kidney International
https://www.readbyqxmd.com/read/28199845/host-genotype-and-gut-microbiome-modulate-insulin-secretion-and-diet-induced-metabolic-phenotypes
#11
Julia H Kreznar, Mark P Keller, Lindsay L Traeger, Mary E Rabaglia, Kathryn L Schueler, Donald S Stapleton, Wen Zhao, Eugenio I Vivas, Brian S Yandell, Aimee Teo Broman, Bruno Hagenbuch, Alan D Attie, Federico E Rey
Genetic variation drives phenotypic diversity and influences the predisposition to metabolic disease. Here, we characterize the metabolic phenotypes of eight genetically distinct inbred mouse strains in response to a high-fat/high-sucrose diet. We found significant variation in diabetes-related phenotypes and gut microbiota composition among the different mouse strains in response to the dietary challenge and identified taxa associated with these traits. Follow-up microbiota transplant experiments showed that altering the composition of the gut microbiota modifies strain-specific susceptibility to diet-induced metabolic disease...
February 14, 2017: Cell Reports
https://www.readbyqxmd.com/read/28198673/diversity-and-enterotype-in-gut-bacterial-community-of-adults-in-taiwan
#12
Chao Liang, Han-Chi Tseng, Hui-Mei Chen, Wei-Chi Wang, Chih-Min Chiu, Jen-Yun Chang, Kuan-Yi Lu, Shun-Long Weng, Tzu-Hao Chang, Chao-Hsiang Chang, Chen-Tsung Weng, Hwei-Ming Wang, Hsien-Da Huang
BACKGROUND: Gastrointestinal microbiota, particularly gut microbiota, is associated with human health. The biodiversity of gut microbiota is affected by ethnicities and environmental factors such as dietary habits or medicine intake, and three enterotypes of the human gut microbiome were announced in 2011. These enterotypes are not significantly correlated with gender, age, or body weight but are influenced by long-term dietary habits. However, to date, only two enterotypes (predominantly consisting of Bacteroides and Prevotella) have shown these characteristics in previous research; the third enterotype remains ambiguous...
January 25, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28198584/the-farming-environment-protects-mice-from-allergen-induced-skin-contact-hypersensitivity
#13
Christophe P Frossard, Vladimir Lazarevic, Nadia Gaïa, Stefano Leo, Camille Doras, Walid Habre, Jacques Schrenzel, Danielle Burger, Philippe A Eigenmann
BACKGROUND: Being born and raised in a farm provides a long-lasting protection for allergies. The microbial environment provided by farm animals is crucial to induce this protective effect, although underlying immune mechanisms remain elusive. OBJECTIVE: To establish a mouse model of global exposure to the farming environment and to study immunologic changes linked to protection of allergy. METHODS: Mice colonies were bred in parallel in a farm cowshed and the University animal facility (AF)...
February 15, 2017: Clinical and Experimental Allergy: Journal of the British Society for Allergy and Clinical Immunology
https://www.readbyqxmd.com/read/28198090/succession-and-dynamics-of-pristionchus-nematodes-and-their-microbiome-during-decomposition-of-oryctes-borbonicus-on-la-r%C3%A3-union-island
#14
Jan M Meyer, Praveen Baskaran, Christian Quast, Vladislav Susoy, Christian Rödelsperger, Frank O Glöckner, Ralf J Sommer
Insects and nematodes represent the most species-rich animal taxa and they occur together in a variety of associations. Necromenic nematodes of the genus Pristionchus are found on scarab beetles with more than 30 species known from worldwide samplings. However, little is known about the dynamics and succession of nematodes and bacteria during the decomposition of beetle carcasses. Here, we study nematode and bacterial succession of the decomposing rhinoceros beetle Oryctes borbonicus on La Réunion Island. We show that Pristionchus pacificus exits the arrested dauer stage seven days after the beetles' deaths...
February 15, 2017: Environmental Microbiology
https://www.readbyqxmd.com/read/28198087/meta-analysis-of-the-human-gut-microbiome-from-urbanized-and-pre-agricultural-populations
#15
REVIEW
Leonardo Mancabelli, Christian Milani, Gabriele Andrea Lugli, Francesca Turroni, Chiara Ferrario, Douwe van Sinderen, Marco Ventura
Metagenomic studies of the human gut microbiome have only recently begun to explore the differences in taxonomic composition between subjects from diverse geographical origins. Here, we compared taxonomy, resistome and functional metabolic properties of publicly available shotgun datasets of human fecal samples collected from different geographical regions (Europe, North America, Asia and Oceania). Such datasets encompassed gut microbiota information corresponding to 13 developed/industrialized societies, as well as two traditional hunter-gatherer, pre-agricultural communities (Tanzanian and Peruvian individuals)...
February 15, 2017: Environmental Microbiology
https://www.readbyqxmd.com/read/28197769/confounding-effects-of-microbiome-on-the-susceptibility-of-tnfsf15-to-crohn-s-disease-in-the-ryukyu-islands
#16
Shigeki Nakagome, Hiroshi Chinen, Atsushi Iraha, Akira Hokama, Yasuaki Takeyama, Shotaro Sakisaka, Toshiyuki Matsui, Judith R Kidd, Kenneth K Kidd, Heba S Said, Wataru Suda, Hidetoshi Morita, Masahira Hattori, Tsunehiko Hanihara, Ryosuke Kimura, Hajime Ishida, Jiro Fujita, Fukunori Kinjo, Shuhei Mano, Hiroki Oota
Crohn's disease (CD) involves chronic inflammation in the gastrointestinal tract due to dysregulation of the host immune response to the gut microbiome. Even though the host-microbiome interactions are likely contributors to the development of CD, a few studies have detected genetic variants that change bacterial compositions and increase CD risk. We focus on one of the well-replicated susceptible genes, tumor necrosis factor superfamily member 15 (TNFSF15), and apply statistical analyses for personal profiles of genotypes and salivary microbiota collected from CD cases and controls in the Ryukyu Islands, southernmost islands of the Japanese archipelago...
February 14, 2017: Human Genetics
https://www.readbyqxmd.com/read/28196533/assessment-of-complementary-feeding-of-canadian-infants-effects-on-microbiome-oxidative-stress-a-randomized-controlled-trial
#17
Wafaa Qasem, Meghan B Azad, Zakir Hossain, Elnaz Azad, Sarah Jorgensen, Sandra Castillo San Juan, Chenxi Cai, Ehsan Khafipour, Trust Beta, L Jackson Roberts, James Friel
BACKGROUND: The World Health Organization recommends exclusive breastfeeding until 6 months followed by introduction of iron-rich complementary foods (CFs). The aim of this study was to determine the impact of different iron-rich CFs on infant gut inflammation and microbiota. METHODS: Eighty-seven exclusively breastfed infants were randomly assigned to receive one of the following as their first CF: iron-fortified cereal (Cer), iron-fortified cereal with fruit (Cer + Fr), or meat (M)...
February 14, 2017: BMC Pediatrics
https://www.readbyqxmd.com/read/28195358/parkinson-s-disease-and-parkinson-s-disease-medications-have-distinct-signatures-of-the-gut-microbiome
#18
Erin M Hill-Burns, Justine W Debelius, James T Morton, William T Wissemann, Matthew R Lewis, Zachary D Wallen, Shyamal D Peddada, Stewart A Factor, Eric Molho, Cyrus P Zabetian, Rob Knight, Haydeh Payami
BACKGROUND: There is mounting evidence for a connection between the gut and Parkinson's disease (PD). Dysbiosis of gut microbiota could explain several features of PD. OBJECTIVE: The objective of this study was to determine if PD involves dysbiosis of gut microbiome, disentangle effects of confounders, and identify candidate taxa and functional pathways to guide research. METHODS: A total of 197 PD cases and 130 controls were studied. Microbial composition was determined by 16S rRNA gene sequencing of DNA extracted from stool...
February 14, 2017: Movement Disorders: Official Journal of the Movement Disorder Society
https://www.readbyqxmd.com/read/28195180/successful-resolution-of-recurrent-clostridium-difficile-infection-using-freeze-dried-encapsulated-fecal-microbiota-pragmatic-cohort-study
#19
Christopher Staley, Matthew J Hamilton, Byron P Vaughn, Carolyn T Graiziger, Krista M Newman, Amanda J Kabage, Michael J Sadowsky, Alexander Khoruts
OBJECTIVES: Fecal microbiota transplantation (FMT) is increasingly being used for treatment of recurrent Clostridium difficile infection (R-CDI) that cannot be cured with antibiotics alone. In addition, FMT is being investigated for a variety of indications where restoration or restructuring of the gut microbial community is hypothesized to be beneficial. We sought to develop a stable, freeze-dried encapsulated preparation of standardized fecal microbiota that can be used for FMT with ease and convenience in clinical practice and research...
February 14, 2017: American Journal of Gastroenterology
https://www.readbyqxmd.com/read/28195066/successful-therapy-of-clostridium-difficile-infection-with-fecal-microbiota-transplantation
#20
P C Konturek, J Koziel, W Dieterich, D Haziri, S Wirtz, I Glowczyk, K Konturek, M F Neurath, Y Zopf
Clostridium difficile infection (CDI) is the most common cause of infectious diarrhea and represents an important burden for healthcare worldwide. Symptoms of severe CDI include watery, foul-smelling diarrhea, peripheral leucocytosis, increased C-reactive protein (CRP), acute renal failure, hypotension and pseudomembranous colitis. Recent studies indicate that the main cause of CDI is dysbiosis, an imbalance in the normal gut microbiota. The restoration of a healthy gut microbiota composition via fecal microbiota transplantation (FMT) recently became more popular...
December 2016: Journal of Physiology and Pharmacology: An Official Journal of the Polish Physiological Society
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