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American Journal of Physiology. Gastrointestinal and Liver Physiology

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https://www.readbyqxmd.com/read/29146678/cross-organ-sensitisation-between-the-colon-and-bladder-to-pee-or-not-to-pee
#1
Luke Grundy, Stuart M Brierley
Chronic abdominal and pelvic pain are common, debilitating clinical conditions experienced by millions of patients around the globe. The origin of such pain commonly arises from the intestine and bladder, which share common primary roles; the collection, storage and expulsion of waste. These visceral organs are located in close proximity to one another, and also share common innervation from spinal afferent pathways. Chronic abdominal pain, constipation or diarrhoea are primary symptoms for patients with Irritable Bowel Syndrome (IBS) or Inflammatory Bowel Disease (IBD)...
November 16, 2017: American Journal of Physiology. Gastrointestinal and Liver Physiology
https://www.readbyqxmd.com/read/29146677/functional-role-and-therapeutic-targeting-of-micrornas-in-inflammatory-bowel-disease
#2
Artin Soroosh, Marina Koutsioumpa, Charalabos Pothoulakis, Dimitrios Iliopoulos
Inflammatory Bowel Diseases (IBD) are chronic inflammatory gastrointestinal diseases, primarily consisting of Ulcerative Colitis (UC) and Crohn's Disease (CD). The complex nature of the disease, as well as the limited therapeutic options characterized by low efficiency and major side effects, shows the importance of developing novel strategies of therapeutic intervention in IBD. Susceptibility loci related to IBD are present only in a small percentage of IBD patients, implying that epigenetic modifications could influence the pathogenesis of the disease...
November 16, 2017: American Journal of Physiology. Gastrointestinal and Liver Physiology
https://www.readbyqxmd.com/read/29146676/epithelial-immunity-priming-defensive-responses-in-the-intestinal-mucosa
#3
Cristina Pardo-Camacho, Ana Maria González-Castro, Bruno Kotska Rodiño-Janeiro, Marc Pigrau, Maria Vicario
As the largest interface between the outside and internal milieu, the intestinal epithelium constitutes the first structural component facing potential luminal threats to homeostasis. This single-cell layer is the epicenter of a tightly-regulated communication network between external and internal factors which converge to prime defensive responses aimed at limiting antigen penetration and the maintenance of intestinal barrier function. The defensive role developed by intestinal epithelial cells (IEC) relies largely on the variety of receptors they express at both extracellular (apical and basolateral) and intracellular compartments, and the capacity of IEC to communicate with immune and nervous systems...
November 16, 2017: American Journal of Physiology. Gastrointestinal and Liver Physiology
https://www.readbyqxmd.com/read/29122749/frontline-defenders-goblet-cell-mediators-dictate-host-microbe-interactions-in-the-intestinal-tract-during-health-and-disease
#4
Joannie M Allaire, Vijay Morampudi, Shauna Mary Crowley, Martin Stahl, Hongbing Yu, Kirandeep Bhullar, Leigh A Knodler, Brian Bressler, Kevan Jacobson, Bruce A Vallance
Goblet cells (GC)s are the predominant secretory epithelial cells lining the luminal surface of the mammalian gastrointestinal (GI) tract. Best known for their apical release of the mucin Muc2, which is critical in the formation of the intestinal mucus barrier, GCs have often been overlooked for their active contributions to intestinal protection and host defense. In part, this oversight reflects the limited tools available to study their function, but also because GCs have long been viewed as relatively passive players in promoting intestinal homeostasis and host defense...
November 9, 2017: American Journal of Physiology. Gastrointestinal and Liver Physiology
https://www.readbyqxmd.com/read/29097359/customization-of-bilio-pancreatic-limb-length-to-modulate-and-sustain-anti-diabetic-effect-of-gastric-bypass-surgery
#5
Atanu Pal, David B Rhoads, Ali Tavakkoli
BACKGROUND: Although Roux-en-Y Gastric Bypass (RYGB) remains the most effective treatment for obesity and Type 2 Diabetes (T2D), many patients fail to achieve remission, or relapse. Increasing intestinal limb lengths of RYGB may improve outcomes, but the mechanistic basis for this remains unclear. We hypothesize Bilio-Pancreatic (BP) limb length modulates the anti-diabetic effect of RYGB. METHODS: Rats underwent RYGB with a 20-cm (RYGB-20cm) or 40-cm (RYGB-40cm) BP limb, and were compared to control animals...
November 2, 2017: American Journal of Physiology. Gastrointestinal and Liver Physiology
https://www.readbyqxmd.com/read/29097358/lncrna-miat-promoted-proliferation-and-invasion-of-hcc-cells-via-sponging-mir-214
#6
Xinli Huang, Yun Gao, Jianjie Qin, Sen Lu
BACKGROUND: The aberrant expression of lncRNAs has been involved in various human tumors including hepatocellular carcinoma (HCC). Our study aimed to investigate the potential molecular mechanism of lncRNA-MIAT in HCC. METHODS: The expression of MIAT and miR-214 in HCC tissues and cells was examined by qRT-PCR, and the levels of EZH2 and β-catenin were detected by western blot assay. The immunoprecipitation analysis was used to detect the level of H3/H4 histone acetylation...
November 2, 2017: American Journal of Physiology. Gastrointestinal and Liver Physiology
https://www.readbyqxmd.com/read/29074486/metabolic-markers-of-protein-maldigestion-after-a-15-n-test-meal-in-minipigs-with-pancreatic-exocrine-insufficiency
#7
Florence Mary, Anne Moesseler, Nadezda Khodorova, Angélique Foucault-Simonin, Robert Benamouzig, Daniel Tomé, Peter Colin Gregory, Claire Gaudichon
The effect of pancreatic exocrine insufficiency (PEI) on protein malabsorption is little documented, partly due to methodological barriers. We aimed to validate biomarkers of protein malabsorption using a (15)N test meal in a minipig model of PEI. Six pancreatic duct-ligated minipigs were used as a model of PEI and four non-operated animals as a control. All animals were equipped with an ileo-caecal re-entrant cannula. Minipigs were given a test meal containing (15)N casein. The PEI animals repeated the test 3 times, in the absence of any pancreatic enzymes, or after pancreatic substitution at 2 levels (A or B: 7500 or 75,000 (lipase) and 388 or 3881 (protease) FIP U)...
October 26, 2017: American Journal of Physiology. Gastrointestinal and Liver Physiology
https://www.readbyqxmd.com/read/29074485/animal-models-of-chemotherapy-induced-mucositis-translational-relevance-and-challenges
#8
Per T Sangild, René Liang Shen, Peter Erik Lotko Pontoppidan, Mathias Rathe
Chemotherapy for cancer patients induces damaging tissue reactions along the epithelium of the gastrointestinal tract (GIT). This chemotherapy-induced mucositis (CIM) is a serious side effect of cytotoxic drugs and several animal models of CIM have been developed to help understand the progression of CIM, and how to prevent it. Animal models allow highly controlled experimental conditions, detailed organ (e.g. GIT) insights, standardized, clinically-relevant treatment regimens and discovery of new biomarkers...
October 26, 2017: American Journal of Physiology. Gastrointestinal and Liver Physiology
https://www.readbyqxmd.com/read/29074484/diurnal-variations-in-intestinal-barrier-integrity-and-liver-pathology-in-mice-implications-for-alcohol-binge
#9
Robin M Voigt, Christopher B Forsyth, Maliha Shaikh, Lijuan Zhang, Shohreh Raeisi, Costica Aloman, Nailliw Zanini Preite, Terrence M Donohue, Louis F Fogg, Ali Keshavarzian
Recent studies suggest that circadian rhythms regulate intestinal barrier integrity but it is not clear whether there are daily variations in barrier integrity. This study investigated daily variations in intestinal barrier integrity, including if there are differences in alcohol-induced intestinal barrier dysfunction after an alcohol binge at different times of day and if this is associated with concurrent liver injury. C57BL6/J male mice were fed a standard chow diet, an alcohol-containing liquid diet, or an alcohol control diet for four weeks...
October 26, 2017: American Journal of Physiology. Gastrointestinal and Liver Physiology
https://www.readbyqxmd.com/read/29074483/transjugular-intrahepatic-portosystemic-shunt-impact-on-systemic-haemodynamics-and-renal-and-cardiac-function-in-patients-with-cirrhosis
#10
Troels Malte Busk, Flemming Bendtsen, Jørgen Hjelm Poulsen, Jens Otto Clemmesen, Fin Stolze Larsen, Jens Peter Goetze, Jens Schmidt Iversen, Magnus Thorsten Jensen, Rasmus Møgelvang, Erling Bjerregaard Pedersen, Jesper Noergaard Bech, Søren Møller
BACKGROUND AND AIMS: Transjugular intrahepatic portosystemic shunt (TIPS) alleviates portal hypertension and possibly increases central blood volume (CBV). Moreover, renal function often improves; however, its effects on cardiac function are unclear. The aims of our study were to examine the effects of TIPS on hemodynamics and renal and cardiac function in patients with cirrhosis. METHODS: In 25 cirrhotic patients, we analyzed systemic, cardiac, and splanchnic hemodynamics by catheterization of the liver veins and right heart chambers before and 1 week after TIPS...
October 26, 2017: American Journal of Physiology. Gastrointestinal and Liver Physiology
https://www.readbyqxmd.com/read/29051189/klf-5-extends-its-fingers-to-desmosomes-the-next-frontier-for-enteric-epithelial-research
#11
Narek Israelyan, Kara Gross Margolis
n/a.
October 19, 2017: American Journal of Physiology. Gastrointestinal and Liver Physiology
https://www.readbyqxmd.com/read/29051188/rapid-change-of-liver-stiffness-after-variceal-ligation-and-tips-implantation
#12
Felix Piecha, Daniel Paech, Janina Sollors, Helmut-Karl Seitz, Martin Rössle, Vanessa Rausch, Sebastian Mueller
Liver stiffness (LS) as measured by transient elastography is widely used to screen for liver fibrosis. However, LS also increases in response to pressure changes like congestion but no data on portal pressure are available. We here study the effect of rapid portal pressure changes on LS. Therefore, LS was assessed directly prior and after ligation of esophageal varices (n=11) as well as TIPS implantation in patients with established cirrhosis (n=14). Additionally, we retrospectively analyzed changes in LS and variceal size in patients with sequential gastroscopic monitoring and LS measurements (n=14)...
October 19, 2017: American Journal of Physiology. Gastrointestinal and Liver Physiology
https://www.readbyqxmd.com/read/29051187/in-vivo-magnetofection-a-novel-approach-for-targeted-topical-delivery-of-nucleic-acids-for-rectoanal-motility-disorders
#13
Jagmohan Singh, Ipsita Mohanty, Satish Rattan
In these studies, we developed a novel approach of in vivo magnetofection for localized delivery of nucleic acids such as micro-RNA-139-p (miR-139-5p, known to target Rho kinase2) to the circular smooth muscle layer of the internal anal sphincter (IAS). The IAS tone is known to play a major role in the rectoanal continence via activation of RhoA-associated kinase (RhoA/ROCK2). These studies established an optimized protocol for efficient gene delivery using an assembly of equal volumes of in vivo PolyMag and miR139-5p or anti-miR-139-5p (100 nM each) injected in the circular smooth muscle layer in the pin-pointed areas of the rat perianal region, and then incubated for 20 minutes under magnetic field...
October 19, 2017: American Journal of Physiology. Gastrointestinal and Liver Physiology
https://www.readbyqxmd.com/read/29051186/distinct-roles-of-intracellular-heat-shock-protein-70-hsp70-in-maintaining-gastrointestinal-homeostasis
#14
Yunwei Wang, Fanfei Lin, Xiaorong Zhu, Vanessa A Leone, Sushila R Dalal, Yun Tao, Jeannette S Messer, Eugene B Chang
The inducible heat shock protein 70 (Hsp70) is both cytoprotective and immunomodulatory, potentially accounting for its critical role in maintaining gastrointestinal homeostasis. When levels are reduced in conditions like inflammatory bowel diseases (IBD), loss of function contributes to the severity and chronicity of these diseases, although through which cell types and mechanisms remains unclear. Here, the role of Hsp70-mediated intestinal epithelial protection and immune regulation in experimental colitis was examined by using a villin-promoter driven Hsp70 transgene in the TNBS and DSS models and in IL10/Hsp70 double knockout (IL10(-/-)/Hsp70(-/-)) mice...
October 19, 2017: American Journal of Physiology. Gastrointestinal and Liver Physiology
https://www.readbyqxmd.com/read/29025734/dietary-copper-fructose-interactions-alter-gut-microbial-activity-in-male-rats
#15
Ming Song, Xiaohong Li, Xiang Zhang, Hongxue Shi, Miriam B Vos, Xiaoli Wei, Yuhua Wang, Hong Gao, Eric C Rouchka, Xinmin Yin, Zhanxiang Zhou, Russell A Prough, Matthew C Cave, Craig J McClain
Dietary copper-fructose interactions contribute to the development of nonalcoholic fatty liver disease (NAFLD). Gut microbiota play critical roles in the pathogenesis of NAFLD. The aim of this study was to determine the effect of different dietary doses of copper and their interactions with high fructose on gut microbiome. Male weanling Sprague-Dawley rats were fed diets with adequate copper (6 ppm, CuA), marginal copper (1.5 ppm, CuM) (low-copper) or supplemented copper (20 ppm, CuS) (high-copper) for 4 weeks...
October 12, 2017: American Journal of Physiology. Gastrointestinal and Liver Physiology
https://www.readbyqxmd.com/read/29025733/hydrogen-sulfide-an-agent-of-stability-at-the-microbiome-mucosa-interface
#16
John L Wallace, Jean-Paul Motta, Andre G Buret
A diverse range of effects of the intestinal microbiota on mucosal defence and injury has become increasingly clear over the past decade. Hydrogen sulfide (H2S) has emerged as an important mediator of many physiological functions, including gastrointestinal mucosal defence and repair. Hydrogen sulfide is produced gastrointestinal tract tissues and by bacteria residing within the gut, and can influence the function of a wide range of cells. The microbiota also appears to be an important target of hydrogen sulfide...
October 12, 2017: American Journal of Physiology. Gastrointestinal and Liver Physiology
https://www.readbyqxmd.com/read/29025732/rack1-maintains-intestinal-homeostasis-by-protecting-the-integrity-of-the-epithelial-barrier
#17
Zhuan-Fen Cheng, Christine A Cartwright
Previously we generated mouse models of Rack1 deficiency to identify key functions for Rack1 in regulating growth of intestinal epithelia: suppressing crypt cell proliferation and regeneration, promoting differentiation and apoptosis, and repressing development of neoplasia. However, other than low body weight, we did not detect an overt phenotype in mice constitutively deleted of Rack1 in intestinal epithelia (vil-Cre:Rack1(fl/fl) mice), presumably because Rack1 was deleted in < 10% of the total surface area of the epithelia...
October 12, 2017: American Journal of Physiology. Gastrointestinal and Liver Physiology
https://www.readbyqxmd.com/read/29025731/macrophage-depletion-using-clodronate-liposomes-decreases-tumorigenesis-and-alters-gut-microbiota-in-the-aom-dss-mouse-model-of-colon-cancer
#18
Jackie E Bader, Reilly T Enos, Kandy T Velazquez, Meredith S Carson, Mitzi Nagarkatti, Prakash S Nagarkatti, Ioulia Chatzistamou, J Mark Davis, James A Carson, Cory Robinson, E Angela Murphy
We examined the role of macrophages in inflammation associated colorectal cancer (CRC). Given the emerging evidence on immune-microbiota interactions in CRC, we also sought to examine the interaction between macrophages and gut microbiota. To induce CRC, male C57BL/6 mice (n=32) received a single injection of azoxymethane (AOM) followed by three cycles of dextran sodium sulfate (DSS) supplemented water at weeks 1, 4, and 7, respectively. Prior to the final DSS cycle (week 7) and twice weekly until sacrifice, mice (n=16/group) received either 200μl i...
October 12, 2017: American Journal of Physiology. Gastrointestinal and Liver Physiology
https://www.readbyqxmd.com/read/29025730/apelin-13-inhibits-gastric-motility-through-vagal-cholinergic-pathway-in-rats
#19
Mehmet Bülbül, Osman Sinen, Melahat Gök, R Alberto Travagli
The expression of apelin and its receptors (APJ) in central autonomic networks suggests that apelin may regulate gastrointestinal motor functions. In rodents, central administration of apelin-13 has been shown to inhibit gastric emptying, however, the mechanisms involved remain to be determined. Using male adult Sprague-Dawley rats, the aims of the present study were i) to determine the expression of APJ receptor in DVC, ii) to assess the effects central application of apelin-13 into the dorsal vagal complex (DVC) on gastric tone and motility and iii) to investigate the neuronal pathways responsible for apelin-induced alterations...
October 12, 2017: American Journal of Physiology. Gastrointestinal and Liver Physiology
https://www.readbyqxmd.com/read/29025729/live-cell-imaging-of-cytosolic-nadh-nad-ratio-in-hepatocytes-and-liver-slices
#20
Ricard Masia, William J McCarty, Carolina Lahmann, Jay Luther, Raymond T Chung, Martin L Yarmush, Gary Yellen
Fatty liver disease (FLD), the most common chronic liver disease in the US, may be caused by alcohol or the metabolic syndrome. Alcohol is oxidized in the cytosol of hepatocytes by alcohol dehydrogenase (ADH), which generates NADH and increases cytosolic NADH/NAD(+) ratio. The increased ratio may be important for development of FLD, but our ability to examine this question is hindered by methodological limitations. To address this, we used the genetically-encoded fluorescent sensor Peredox to obtain dynamic, real-time measurements of cytosolic NADH/NAD(+) ratio in living hepatocytes...
October 12, 2017: American Journal of Physiology. Gastrointestinal and Liver Physiology
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