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https://www.readbyqxmd.com/read/28098206/protein-kinase-c-%C3%AE-signaling-is-required-for-dietary-prebiotic-induced-strengthening-of-intestinal-epithelial-barrier-function
#1
Richard Y Wu, Majd Abdullah, Pekka Määttänen, Ana Victoria C Pilar, Erin Scruten, Kathene C Johnson-Henry, Scott Napper, Catherine O'Brien, Nicola L Jones, Philip M Sherman
Prebiotics are non-digestible oligosaccharides that promote the growth of beneficial gut microbes, but it is unclear whether they also have direct effects on the intestinal mucosal barrier. Here we demonstrate two commercial prebiotics, inulin and short-chain fructo-oligosaccharide (scFOS), when applied onto intestinal epithelia in the absence of microbes, directly promote barrier integrity to prevent pathogen-induced barrier disruptions. We further show that these effects involve the induction of select tight junction (TJ) proteins through a protein kinase C (PKC) δ-dependent mechanism...
January 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28096373/pathogen-mediated-manipulation-of-arthropod-microbiota-to-promote-infection
#2
Nabil M Abraham, Lei Liu, Brandon Lyon Jutras, Akhilesh K Yadav, Sukanya Narasimhan, Vissagan Gopalakrishnan, Juliana M Ansari, Kimberly K Jefferson, Felipe Cava, Christine Jacobs-Wagner, Erol Fikrig
Arthropods transmit diverse infectious agents; however, the ways microbes influence their vector to enhance colonization are poorly understood. Ixodes scapularis ticks harbor numerous human pathogens, including Anaplasma phagocytophilum, the agent of human granulocytic anaplasmosis. We now demonstrate that A. phagocytophilum modifies the I. scapularis microbiota to more efficiently infect the tick. A. phagocytophilum induces ticks to express Ixodes scapularis antifreeze glycoprotein (iafgp), which encodes a protein with several properties, including the ability to alter bacterial biofilm formation...
January 17, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28096237/the-human-microbiome-and-cancer
#3
Seesandra V Rajagopala, Sanjay Vashee, Lauren M Oldfield, Yo Suzuki, J Craig Venter, Amalio Telenti, Karen E Nelson
Recent scientific advances have significantly contributed to our understanding of the complex connection between the microbiome and cancer. Our bodies are continuously exposed to microbial cells, both resident and transient, as well as their by-products including toxic metabolites. Circulation of toxic metabolites may contribute to cancer onset or progression at locations distant from where a particular microbe resides. Moreover, microbes may migrate to other locations in the human body and become associated with tumor development...
January 17, 2017: Cancer Prevention Research
https://www.readbyqxmd.com/read/28092661/interactions-between-the-microbiota-immune-and-nervous-systems-in-health-and-disease
#4
REVIEW
Thomas C Fung, Christine A Olson, Elaine Y Hsiao
The diverse collection of microorganisms that inhabit the gastrointestinal tract, collectively called the gut microbiota, profoundly influences many aspects of host physiology, including nutrient metabolism, resistance to infection and immune system development. Studies investigating the gut-brain axis demonstrate a critical role for the gut microbiota in orchestrating brain development and behavior, and the immune system is emerging as an important regulator of these interactions. Intestinal microbes modulate the maturation and function of tissue-resident immune cells in the CNS...
January 16, 2017: Nature Neuroscience
https://www.readbyqxmd.com/read/28092310/new-insights-into-the-gut-as-the-driver-of-critical-illness-and-organ-failure
#5
Mei Meng, Nathan J Klingensmith, Craig M Coopersmith
PURPOSE OF REVIEW: The gut has long been hypothesized to be the 'motor' of multiple organ dysfunction syndrome. This review serves as an update on new data elucidating the role of the gut as the propagator of organ failure in critical illness. RECENT FINDINGS: Under basal conditions, the gut absorbs nutrients and serves as a barrier that prevents approximately 40 trillion intraluminal microbes and their products from causing host injury. However, in critical illness, gut integrity is disrupted with hyperpermeability and increased epithelial apoptosis, allowing contamination of extraluminal sites that are ordinarily sterile...
January 13, 2017: Current Opinion in Critical Care
https://www.readbyqxmd.com/read/28092309/microbiota-targeted-therapies-on-the-intensive-care-unit
#6
Bastiaan W Haak, Marcel Levi, W Joost Wiersinga
PURPOSE OF REVIEW: The composition and diversity of the microbiota of the human gut, skin, and several other sites is severely deranged in critically ill patients on the ICU, and it is likely that these disruptions can negatively affect outcome. We here review new and ongoing studies that investigate the use of microbiota-targeted therapeutics in the ICU, and provide recommendations for future research. RECENT FINDINGS: Practically every intervention in the ICU as well as the physiological effects of critical illness itself can have a profound impact on the gut microbiota...
January 13, 2017: Current Opinion in Critical Care
https://www.readbyqxmd.com/read/28087531/salivary-gluten-degradation-and-oral-microbial-profiles-in-health-and-celiac-disease
#7
Na Tian, Lina Faller, Daniel A Leffler, Ciaran P Kelly, Joshua Hansen, Jos A Bosch, Guoxian Wei, Bruce J Paster, Detlef Schuppan, Eva J Helmerhorst
: Celiac disease (CD) is a chronic immune-mediated enteropathy induced by dietary gluten in genetically predisposed individuals. Saliva harbors the second highest bacterial load of the GI tract after the colon. Moreover, saliva contains gluten-degrading enzymes produced by oral bacteria that may modify gluten processing in the intestine and susceptibility to celiac disease (CD). AIM: To investigate salivary enzymatic activities and oral microbial profiles in healthy subjects vs patients with classical and refractory CD...
January 13, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28087253/what-is-an-ideal-antibiotic-discovery-challenges-and-path-forward
#8
REVIEW
Sheo B Singh, Katherine Young, Lynn L Silver
An ideal antibiotic is an antibacterial agent that kills or inhibits the growth of all harmful bacteria in a host, regardless of site of infection without affecting beneficial gut microbes (gut flora) or causing undue toxicity to the host. Sadly, no such antibiotics exist. What exists are many effective Gram-positive antibacterial agents as well as broad-spectrum agents that provide treatment of certain Gram-negative bacteria but not holistic treatment of all bacteria. However effectiveness of all antibacterial agents is being rapidly eroded due to resistance...
January 10, 2017: Biochemical Pharmacology
https://www.readbyqxmd.com/read/28077947/asthma-and-the-microbiome-defining-the-critical-window-in-early-life
#9
REVIEW
Leah T Stiemsma, Stuart E Turvey
Asthma is a chronic inflammatory immune disorder of the airways affecting one in ten children in westernized countries. The geographical disparity combined with a generational rise in prevalence, emphasizes that changing environmental exposures play a significant role in the etiology of this disease. The microflora hypothesis suggests that early life exposures are disrupting the composition of the microbiota and consequently, promoting immune dysregulation in the form of hypersensitivity disorders. Animal model research supports a role of the microbiota in asthma and atopic disease development...
2017: Allergy, Asthma, and Clinical Immunology
https://www.readbyqxmd.com/read/28076766/are-gut-microbes-responsible-for-post-dieting-weight-rebound
#10
Julien Chilloux, Marc-Emmanuel Dumas
One of the dieting conundrums in the age of the obesity epidemic is the cycle of weight loss and regain known as the "yo-yo effect." Thaiss et al. (2016) demonstrate that the microbiome plays a key role in this phenomenon and that simple dietary supplementations can reset the weight-rebound clock.
January 10, 2017: Cell Metabolism
https://www.readbyqxmd.com/read/28073366/oral-treatment-with-lactobacillus-rhamnosus-attenuates-behavioural-deficits-and-immune-changes-in-chronic-social-stress
#11
Aadil Bharwani, M Firoz Mian, Michael G Surette, John Bienenstock, Paul Forsythe
BACKGROUND: Stress-related disorders involve systemic alterations, including disruption of the intestinal microbial community. Given the putative connections between the microbiota, immunity, neural function, and behaviour, we investigated the potential for microbe-induced gut-to-brain signalling to modulate the impact of stress on host behaviour and immunoregulation. METHODS: Male C57BL/6 mice treated orally over 28 days with either Lactobacillus rhamnosus (JB-1) ™ or vehicle were subjected to chronic social defeat and assessed for alterations in behaviour and immune cell phenotype...
January 11, 2017: BMC Medicine
https://www.readbyqxmd.com/read/28070563/gut-microbiome-of-the-canadian-arctic-inuit
#12
Catherine Girard, Nicolas Tromas, Marc Amyot, B Jesse Shapiro
Diet is a major determinant of community composition in the human gut microbiome, and "traditional" diets have been associated with distinct and highly diverse communities, compared to Western diets. However, most traditional diets studied have been those of agrarians and hunter-gatherers consuming fiber-rich diets. In contrast, the Inuit of the Canadian Arctic have been consuming a traditional diet low in carbohydrates and rich in animal fats and protein for thousands of years. We hypothesized that the Inuit diet and lifestyle would be associated with a distinct microbiome...
January 2017: MSphere
https://www.readbyqxmd.com/read/28069756/inside-out-hiv-the-gut-microbiome-and-the-mucosal-immune-system
#13
REVIEW
Jay Liu, Brett Williams, Daniel Frank, Stephanie M Dillon, Cara C Wilson, Alan L Landay
The components of the human gut microbiome have been found to influence a broad array of pathologic conditions ranging from heart disease to diabetes and even to cancer. HIV infection upsets the delicate balance in the normal host-microbe interaction both through alterations in the taxonomic composition of gut microbial communities as well as through disruption of the normal host response mechanisms. In this article we review the current methods of gut microbiome analysis and the resulting data regarding how HIV infection might change the balance of commensal bacteria in the gut...
January 15, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28069102/the-effect-of-cp-concentration-in-the-diet-on-urea-kinetics-and-microbial-usage-of-recycled-urea-in-cattle-a-meta-analysis
#14
E D Batista, E Detmann, S C Valadares Filho, E C Titgemeyer, R F D Valadares
In ruminants, urea recycling is considered an evolutionary advantage. The amount of urea recycled mainly depends of the nitrogen (N) intake and the amount of organic matter (OM) digested in the rumen. Because recycled N contributes to meeting microbial N requirements, accurate estimates of urea recycling can improve the understanding of efficiency of N utilization and N losses to the environment. The objective of this study was to evaluate urea kinetics and microbial usage of recycled urea N in ruminants using a meta-analytical approach...
January 10, 2017: Animal: An International Journal of Animal Bioscience
https://www.readbyqxmd.com/read/28067223/the-microbiota-maintain-homeostasis-of-liver-resident-%C3%AE-%C3%AE-t-17-cells-in-a-lipid-antigen-cd1d-dependent-manner
#15
Fenglei Li, Xiaolei Hao, Yongyan Chen, Li Bai, Xiang Gao, Zhexiong Lian, Haiming Wei, Rui Sun, Zhigang Tian
The microbiota control regional immunity using mechanisms such as inducing IL-17A-producing γδ T (γδT-17) cells in various tissues. However, little is known regarding hepatic γδT cells that are constantly stimulated by gut commensal microbes. Here we show hepatic γδT cells are liver-resident cells and predominant producers of IL-17A. The microbiota sustain hepatic γδT-17 cell homeostasis, including activation, survival and proliferation. The global commensal quantity affects the number of liver-resident γδT-17 cells; indeed, E...
January 9, 2017: Nature Communications
https://www.readbyqxmd.com/read/28066816/from-genomes-to-phenotypes-traitar-the-microbial-trait-analyzer
#16
Aaron Weimann, Kyra Mooren, Jeremy Frank, Phillip B Pope, Andreas Bremges, Alice C McHardy
The number of sequenced genomes is growing exponentially, profoundly shifting the bottleneck from data generation to genome interpretation. Traits are often used to characterize and distinguish bacteria and are likely a driving factor in microbial community composition, yet little is known about the traits of most microbes. We describe Traitar, the microbial trait analyzer, which is a fully automated software package for deriving phenotypes from a genome sequence. Traitar provides phenotype classifiers to predict 67 traits related to the use of various substrates as carbon and energy sources, oxygen requirement, morphology, antibiotic susceptibility, proteolysis, and enzymatic activities...
November 2016: MSystems
https://www.readbyqxmd.com/read/28065939/an-expanding-stage-for-commensal-microbes-in-host-immune-regulation
#17
REVIEW
Yan Shi, Libing Mu
Gastrointestinal commensal microbiota is a concentrated mix of microbial life forms, including bacteria, fungi, archaea and viruses. These life forms are targets of host antimicrobial defense in order to establish a homeostatic symbiosis inside the host. However, they are also instrumental in shaping the functions of our immune system via a diverse set of communication mechanisms. In the gut, T helper 17, regulatory T and B cells are continuously tuned by specific microbial strains and metabolic processes. These cells in return help to establish a mutually beneficial exchange with the gut microbial contents...
January 9, 2017: Cellular & Molecular Immunology
https://www.readbyqxmd.com/read/28065879/structural-zeros-in-high-dimensional-data-with-applications-to-microbiome-studies
#18
Abhishek Kaul, Ori Davidov, Shyamal D Peddada
SUMMARYThis paper is motivated by the recent interest in the analysis of high-dimensional microbiome data. A key feature of these data is the presence of "structural zeros" which are microbes missing from an observation vector due to an underlying biological process and not due to error in measurement. Typical notions of missingness are unable to model these structural zeros. We define a general framework which allows for structural zeros in the model and propose methods of estimating sparse high-dimensional covariance and precision matrices under this setup...
January 8, 2017: Biostatistics
https://www.readbyqxmd.com/read/28065740/bacterial-signaling-to-the-nervous-system-via-toxins-and-metabolites
#19
REVIEW
Nicole J Yang, Isaac M Chiu
Mammalian hosts interface intimately with commensal and pathogenic bacteria. It is increasingly clear that molecular interactions between the nervous system and microbes contribute to health and disease. Both commensal and pathogenic bacteria are capable of producing molecules that act on neurons and affect essential aspects of host physiology. Here we highlight several classes of physiologically important molecular interactions that occur between bacteria and the nervous system. First, clostridial neurotoxins block neurotransmission to or from neurons by targeting the SNARE complex, causing the characteristic paralyses of botulism and tetanus during bacterial infection...
January 5, 2017: Journal of Molecular Biology
https://www.readbyqxmd.com/read/28064261/clinical-effects-of-prebiotics-in-pediatric-population
#20
Rok Orel, Lea Vodušek Reberšak
CONTEXT: Prebiotics are non-digestible components of food that in a selective manner trigger the expansion of microbes in the gut with valuable effects for the health of the host. In our document, current literature pertaining to the clinical effects of the use of prebiotics for the treatment and prevention of some common pediatric pathology such as infantile colic, constipation, absorption of minerals, weight gain, diarrhea, respiratory infections, and eczema is reviewed. EVIDENCE: Data was collected through search of the MEDLINE, PubMed, UpToDate, Cochrane Database of Systemic Reviews, and the Cochrane Controlled Trials Register database as well as through references from relevant articles, all until September 2015...
December 15, 2016: Indian Pediatrics
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