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The sensitive gut

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https://www.readbyqxmd.com/read/28323997/degradation-paradigm-of-the-gut-hormone-pancreatic-polypeptide-by-hepatic-and-renal-peptidases
#1
Joyceline Cuenco, James Minnion, Tricia Tan, Rebecca Scott, Natacha Germain, Yiin Ling, Rong Chen, Mohammad Ghatei, Stephen Bloom
Pancreatic polypeptide (PP) is a gut hormone that acts on Y4 receptors to reduce appetite. Obese humans display a reduced postprandial rise in PP and remain fully sensitive to the anorectic effects of exogenous PP. The utility of PP as an antiobesity treatment is limited by its short circulating half-life. Insight into the mechanisms by which PP is degraded may aid design of long-acting PP analogues.We aimed to investigate the role of peptidases in PP degradation with a view to determining whether inhibition of these enzymes enhanced PP plasma levels and bioactivity in vivo...
March 9, 2017: Endocrinology
https://www.readbyqxmd.com/read/28290735/quantitative-biokinetics-of-titanium-dioxide-nanoparticles-after-intratracheal-instillation-in-rats-part-3
#2
Wolfgang G Kreyling, Uwe Holzwarth, Nadine Haberl, Jan Kozempel, Alexander Wenk, Stephanie Hirn, Carsten Schleh, Martin Schäffler, Jens Lipka, Manuela Semmler-Behnke, Neil Gibson
The biokinetics of a size-selected fraction (70nm median size) of commercially available and (48)V-radiolabeled [(48)V]TiO2 nanoparticles has been investigated in healthy adult female Wistar-Kyoto rats at retention time-points of 1h, 4h, 24h, 7d and 28d after intratracheal instillation of a single dose of an aqueous [(48)V]TiO2-nanoparticle suspension. A completely balanced quantitative biodistribution in all organs and tissues was obtained by applying typical [(48)V]TiO2-nanoparticle doses in the range of 40-240 μg·kg(-1) bodyweight and making use of the high sensitivity of the radiotracer technique...
March 14, 2017: Nanotoxicology
https://www.readbyqxmd.com/read/28290517/sensitivity-to-oxazolone-induced-dermatitis-is-transferable-with-gut-microbiota-in-mice
#3
Line Fisker Zachariassen, Lukasz Krych, Kåre Engkilde, Dennis Sandris Nielsen, Witold Kot, Camilla Hartmann Friis Hansen, Axel Kornerup Hansen
Atopic Dermatitis (AD) has been associated with gut microbiota (GM) dysbiosis in humans, indicating a causative role of GM in AD etiology. Furthermore, the GM strongly correlates to essential disease parameters in the well-known oxazolone-induced mouse model of AD. Here, we demonstrate that it is possible to transfer both a high-responding and a low-responding AD phenotype with GM from conventional mice to germ-free mice. The mice inoculated with the high-responding GM had significantly higher clinical score, increased ear thickness, and increased levels of IL-1β, TNFα, IL-4, IL-5, and IL-6 compared to the mice inoculated with the low-responding GM...
March 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28289731/deblur-rapidly-resolves-single-nucleotide-community-sequence-patterns
#4
Amnon Amir, Daniel McDonald, Jose A Navas-Molina, Evguenia Kopylova, James T Morton, Zhenjiang Zech Xu, Eric P Kightley, Luke R Thompson, Embriette R Hyde, Antonio Gonzalez, Rob Knight
High-throughput sequencing of 16S ribosomal RNA gene amplicons has facilitated understanding of complex microbial communities, but the inherent noise in PCR and DNA sequencing limits differentiation of closely related bacteria. Although many scientific questions can be addressed with broad taxonomic profiles, clinical, food safety, and some ecological applications require higher specificity. Here we introduce a novel sub-operational-taxonomic-unit (sOTU) approach, Deblur, that uses error profiles to obtain putative error-free sequences from Illumina MiSeq and HiSeq sequencing platforms...
March 2017: MSystems
https://www.readbyqxmd.com/read/28279860/inhibition-of-spore-germination-growth-and-toxin-activity-of-clinically-relevant-c-%C3%A2-difficile-strains-by-gut-microbiota-derived-secondary-bile-acids
#5
Rajani Thanissery, Jenessa A Winston, Casey M Theriot
The changing epidemiology of Clostridium difficile infection over the past decades presents a significant challenge in the management of C. difficile associated diseases. The gastrointestinal tract microbiota provides colonization resistance against C. difficile, and growing evidence suggests that gut microbial derived secondary bile acids (SBAs) play a role. We hypothesized that the C. difficile life cycle; spore germination and outgrowth, growth, and toxin production, of strains that vary by age and ribotype will differ in their sensitivity to SBAs...
March 6, 2017: Anaerobe
https://www.readbyqxmd.com/read/28279578/sleeve-gastrectomy-drives-persistent-shifts-in-the-gut-microbiome
#6
Cyrus Jahansouz, Christopher Staley, David A Bernlohr, Michael J Sadowsky, Alexander Khoruts, Sayeed Ikramuddin
BACKGROUND: Changes in the gut microbiome following bariatric surgery have been causally linked to metabolic benefits. OBJECTIVES: We sought to characterize and assess the stability of gut microbiome shifts following sleeve gastrectomy (SG). SETTING: University laboratories. METHODS: Diet-induced obese mice were randomized to SG or sham surgery. Mice were housed individually or cohoused such that one SG mouse was housed with one weight-matched, sham-operated mouse...
January 4, 2017: Surgery for Obesity and related Diseases: Official Journal of the American Society for Bariatric Surgery
https://www.readbyqxmd.com/read/28274108/small-intestinal-bacterial-overgrowth-and-irritable-bowel-syndrome-a-bridge-between-functional-organic-dichotomy
#7
REVIEW
Uday C Ghoshal, Ratnakar Shukla, Ujjala Ghoshal
The pathogenesis of irritable bowel syndrome (IBS), once thought to be largely psychogenic in origin, is now understood to be multifactorial. One of the reasons for this paradigm shift is the realization that gut dysbiosis, including small intestinal bacterial overgrowth (SIBO), causes IBS symptoms. Between 4% and 78% of patients with IBS and 1% and 40% of controls have SIBO; such wide variations in prevalence might result from population differences, IBS diagnostic criteria, and, most importantly, methods to diagnose SIBO...
March 15, 2017: Gut and Liver
https://www.readbyqxmd.com/read/28272549/low-dose-penicillin-exposure-in-early-life-decreases-th17-and-the-susceptibility-to-dss-colitis-in-mice-through-gut-microbiota-modification
#8
Shuang Jin, Di Zhao, Chenwen Cai, Dongjuan Song, Jun Shen, Antao Xu, Yuqi Qiao, Zhihua Ran, Qing Zheng
Antibiotic exposure in early life can lead to a significant change of the gut microbiota and may contribute to later onset of inflammatory bowel disease (IBD). However, the relationship between early-life antibiotic treatment and IBD is ambiguous, according to contradicting results of epidemiologic studies. In the present study, we demonstrated that low-dose penicillin pre-treatment had a unique protective effect against mouse colitis induced by dextran sodium sulfate (DSS). Low-dose penicillin also suppressed the expression of pro-inflammatory cytokine IL-17 in various intestinal tissues, and decreased the amount of Th17 cells in small-intestine lamina propria...
March 8, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28271623/a-double-blind-placebo-controlled-study-to-assess-the-effect-of-a-probiotic-mixture-on-symptoms-and-inflammatory-markers-in-women-with-diarrhea-predominant-ibs
#9
K Hod, A D Sperber, Y Ron, M Boaz, R Dickman, S Berliner, Z Halpern, N Maharshak, R Dekel
BACKGROUND: Micro-inflammation is considered an element in the pathogenesis of irritable bowel syndrome (IBS). High-sensitivity C reactive protein (hs-CRP) was previously shown to be higher in IBS compared to healthy controls, albeit within the normal range. Since probiotics may suppress micro-inflammation in the gut, we tested if they reduce symptoms and inflammatory markers (hs-CRP and fecal calprotectin (FC) in diarrhea-predominant IBS (IBS-D). The aim of this study was to assess the clinical and laboratory effects of BIO-25, a multispecies probiotic, in women with IBS-D...
March 8, 2017: Neurogastroenterology and Motility: the Official Journal of the European Gastrointestinal Motility Society
https://www.readbyqxmd.com/read/28266623/commensal-gut-bacteria-modulate-phosphorylation-dependent-ppar%C3%AE-transcriptional-activity-in-human-intestinal-epithelial-cells
#10
Malgorzata Nepelska, Tomas de Wouters, Elsa Jacouton, Fabienne Béguet-Crespel, Nicolas Lapaque, Joël Doré, Velmurugesan Arulampalam, Hervé M Blottière
In healthy subjects, the intestinal microbiota interacts with the host's epithelium, regulating gene expression to the benefit of both, host and microbiota. The underlying mechanisms remain poorly understood, however. Although many gut bacteria are not yet cultured, constantly growing culture collections have been established. We selected 57 representative commensal bacterial strains to study bacteria-host interactions, focusing on PPARγ, a key nuclear receptor in colonocytes linking metabolism and inflammation to the microbiota...
March 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28263849/chemical-profiles-and-pharmacological-activities-of-chang-kang-fang-a-multi-herb-chinese-medicinal-formula-for-treating-irritable-bowel-syndrome
#11
Qian Mao, Lei Shi, Zhi-Gang Wang, Yu-Hui Luo, Yin-Yu Wang, Xue Li, Min Lu, Jian-Min Ju, Jin-Di Xu, Ming Kong, Shan-Shan Zhou, Min-Qin Shen, Song-Lin Li
ETHNOPHARMACOLOGICAL RELEVANCE: Chang-Kang-Fang formula (CKF), a multi-herb traditional Chinese medicinal formula, has been clinically used for treatment of irritable bowel syndrome (IBS). The mechanisms of CKF for treating IBS and the components that are responsible for the activities were still unknown. AIM OF THE STUDY: To investigate the chemical profiles and effects of CKF on IBS model. MATERIALS AND METHODS: The chemical profiles of CKF were investigated by ultra performance liquid chromatography coupled with quadrupole time-of-flight mass spectrometry (UHPLC-Q/TOF-MS/MS)...
March 2, 2017: Journal of Ethnopharmacology
https://www.readbyqxmd.com/read/28259479/-management-of-mesenteric-ischemia-in-the-era-of-intestinal-stroke-centers-the-gut-and-lifesaving-strategy
#12
A Nuzzo, O Corcos
Mesenteric ischemia is a gut and life-threatening, medical and surgical, digestive and vascular emergency. Mesenteric ischemia is the result of an arterial or venous occlusion, a vasospasm secondary to low-flow states in intensive care patients, aortic clamping during vascular surgery or intestinal transplantation. Progression towards mesenteric infarction and its complications is unpredictable and correlates with high rates of mortality or a high risk of short bowel syndrome in case of survival. Thus, mesenteric ischemia should be diagnosed and treated at an early stage, when gut injury is still reversible...
March 1, 2017: La Revue de Médecine Interne
https://www.readbyqxmd.com/read/28259402/identification-and-quantification-of-12-pharmaceuticals-in-water-collected-from-milking-parlors-food-safety-implications
#13
María Veiga-Gómez, Carolina Nebot, Carlos Manuel Franco, Jose Manuel Miranda, Beatriz Vázquez, Alberto Cepeda
The introduction of drug residues into the food chain and their presence in drinking water has been recently investigated. The aim of this work was to monitor the presence of 19 active drugs in water samples collected from milking parlors of dairy farms located in Galicia (northwest Spain), one of the main Spanish milking areas. Overall, 65% of the samples tested positive for at least one of the compounds analyzed. A total of 12 drugs were measured, with concentrations ranging between 17 and 3,941 ng/L. Considering that a mixture of compounds may contribute to the overall effect of each compound and might increase or reduce its toxicity, it should be noted that 29% of the samples tested contained more than one pharmaceutical...
March 2, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28259395/short-communication-tryptic-%C3%AE-casein-hydrolysate-modulates-enteric-nervous-system-development-in-primary-culture
#14
F Cossais, I Clawin-Rädecker, P C Lorenzen, M Klempt
The intestinal tract of the newborn is particularly sensitive to gastrointestinal disorders, such as infantile diarrhea or necrotizing colitis. Perinatal development of the gut also encompasses the maturation of the enteric nervous system (ENS), a main regulator of intestinal motility and barrier functions. It was recently shown that ENS maturation can be enhanced by nutritional factors to improve intestinal maturation. Bioactivity of milk proteins is often latent, requiring the release of bioactive peptides from inactive native proteins...
March 2, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28257307/small-intestinal-bacterial-overgrowth-as-a-cause-for-irritable-bowel-syndrome-guilty-or-not-guilty
#15
Imran Aziz, Hans Törnblom, Magnus Simrén
PURPOSE OF REVIEW: Small intestinal bacterial overgrowth (SIBO) has been proposed as a cause of irritable bowel syndrome (IBS). However, this relationship has been subject to controversy. This review aims to provide a current perspective on the SIBO-IBS hypothesis. RECENT FINDINGS: Case-control studies evaluating the prevalence of SIBO in IBS and healthy individuals have shown conflicting results. Moreover, the tests available in routine clinical practice to diagnose SIBO are not valid and lack both sensitivity and specificity...
March 2, 2017: Current Opinion in Gastroenterology
https://www.readbyqxmd.com/read/28256032/localization-of-the-5-hydroxytryptamine-4-receptor-in-equine-enteric-neurons-and-extrinsic-sensory-fibers
#16
F Giancola, A M Rambaldi, F Bianco, S Iusco, N Romagnoli, C Tagliavia, C Bombardi, P Clavenzani, R De Giorgio, R Chiocchetti
BACKGROUND: Serotonin plays a pivotal role in regulating gut motility, visceral sensitivity, and fluid secretion via specific receptors. Among these receptors, 5-HT4 exerts a prominent control on gut motor function. Although the prokinetic effect exerted by 5-HT4 agonists is well known, the cellular sites of 5-HT4 expression remain poorly understood in large mammals, e.g., horses. In this study, we evaluated the distribution of 5-HT4 in the horse intestine and in foals with enteric aganglionosis, reminiscent of human Hirschsprung's disease...
March 3, 2017: Neurogastroenterology and Motility: the Official Journal of the European Gastrointestinal Motility Society
https://www.readbyqxmd.com/read/28249816/anti-inflammatory-and-antioxidant-effects-of-polyphenols-extracted-from-antirhea-borbonica-medicinal-plant-on-adipocytes-exposed-to-porphyromonas-gingivalis-and-escherichia-coli-lipopolysaccharides
#17
Fanny Le Sage, Olivier Meilhac, Marie-Paule Gonthier
In obesity, gut microbiota LPS may translocate into the blood stream and then contribute to adipose tissue inflammation and oxidative stress, leading to insulin resistance. A causal link between periodontal infection, obesity and type 2 diabetes has also been suggested. We evaluated the ability of polyphenols from Antirhea borbonica medicinal plant to improve the inflammatory and redox status of 3T3-L1 adipocytes exposed to LPS of Porphyromonas gingivalis periodontopathogen or Escherichia coli enterobacteria...
February 27, 2017: Pharmacological Research: the Official Journal of the Italian Pharmacological Society
https://www.readbyqxmd.com/read/28244660/bioactive-food-chemicals-and-gastrointestinal-symptoms-a-focus-of-salicylates
#18
REVIEW
Sreepurna Malakar
Bioactive food chemicals are substances present in food that are capable of interacting with living cells causing changes in physiological functions. Salicylic acid (SA), a plant hormone involved in plant immune response, is one such bioactive food chemical. Aspirin, a commercially available SA, might play beneficial roles in cardiovascular health and colon cancer. It may also cause urticaria, angioedema, asthma, and gastrointestinal symptoms in SA-sensitive individuals. Dietary SA might exert similar beneficial effects and/or may induce similar symptoms in hypersensitive individuals...
March 2017: Journal of Gastroenterology and Hepatology
https://www.readbyqxmd.com/read/28241728/ampk-%C3%AE-ketoglutarate-axis-regulates-intestinal-water-and-ion-homeostasis-in-young-pigs
#19
Liuqin He, Niu Huang, Huan Li, Junquan Tian, Xihong Zhou, Tiejun Li, Kang Yao, Guoyao Wu, Yulong Yin
Water and ion absorption via sensitive aquaporins (AQPs) and ion channels is of critical importance in intestinal health. However, whether α-ketoglutarate (AKG) could improve intestinal water and ion homeostasis in lipopolysaccharide (LPS)-challenged piglets and whether the AMP-activated protein kinase (AMPK) pathway is involved remains largely unknown. This study was conducted to investigate the effect of dietary AKG supplementation on the small intestinal water and ion homeostasis through modulating the AMPK pathway in a piglet diarrhea model...
March 22, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28241125/the-effect-of-intra-dialytic-exercise-on-inflammation-and-blood-endotoxin-levels
#20
Jonathan Wong, Philip Davis, Ashish Patidar, Yonglong Zhang, Enric Vilar, Malcolm Finkelman, Ken Farrington
BACKGROUND: In healthy individuals, an acute inflammatory response occurs after intense exercise due to gut ischaemia and intestinal bacterial endotoxin translocation into the bloodstream. This process maybe exacerbated in patients who exercise during dialysis due to large volume shifts experienced by many during haemodialysis (HD). The acute effect of intra-dialytic exercise on blood endotoxins and inflammation is not known. METHOD: The effect of intra-dialytic exercise on blood endotoxin and inflammation was investigated in 10 patients and compared with resting haemodialysis...
February 28, 2017: Blood Purification
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