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American Journal of Physiology. Gastrointestinal and Liver Physiology

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https://www.readbyqxmd.com/read/28619730/consumption-of-a-high-iron-diet-disrupts-homeostatic-regulation-of-intestinal-copper-absorption-in-adolescent-mice
#1
Jung-Heun Ha, Caglar Doguer, James F Collins
High-iron feeding of rodents has been commonly used to model human iron-overload disorders. We recently noted that high-iron consumption impaired growth and caused severe systemic copper deficiency in growing rats, but the mechanism by which this occurred could not be determined due to technical limitations. In the current investigation, we thus utilized mice; first to determine if the same phenomenon occurred in another mammalian species, and secondly since we could assess in vivo copper absorption in mice...
June 15, 2017: American Journal of Physiology. Gastrointestinal and Liver Physiology
https://www.readbyqxmd.com/read/28619729/characterization-and-mechanisms-of-the-supragastric-belch-in-the-cat
#2
Ivan M Lang, Bidyut K Medda, Reza Shaker
A response, i.e., the supragastric belch (SGB), in which a belch occurs without gastric involvement has been characterized in humans. The aims of this study were to determine whether animals have an SGB and if so to determine its mechanisms. Studies were conducted in decerebrate cats (N=30) with EMG electrodes on hyoid, pharyngeal, esophageal, and diaphragm muscles. The effects of distending different regions of the esophagus in different manners using a balloon were quantified to determine the most appropriate stimulus for activating the cat SGB...
June 15, 2017: American Journal of Physiology. Gastrointestinal and Liver Physiology
https://www.readbyqxmd.com/read/28619728/activated-notch-signaling-cascade-is-correlated-with-stem-cell-differentiation-toward-absorptive-progenitors-after-massive-small-bowel-resection-in-a-rat
#3
Igor Sukhotnik, Arnold G Coran, Yulia Pollak, Eviatar Kuhnreich, Drora Berkowitz, Amulya K Saxena
Notch signaling is thought to act to drive cell versification in the lining of the small intestine. The purpose of the present study was to evaluate the role of Notch signaling pathway in stem cell differentiationin the late stages of intestinal adaptation after massive small bowel resection in a rat. Male Sprague-Dawley rats were randomly assigned to one of two experimental groups of 8 rats each: Sham rats underwent bowel transection and re-anastomosis, SBS- rats underwent 75% small bowel resection. Rats were sacrificed on day 14...
June 15, 2017: American Journal of Physiology. Gastrointestinal and Liver Physiology
https://www.readbyqxmd.com/read/28619727/rna-seq-implicates-deregulation-of-the-immune-system-in-the-pathogenesis-of-diverticulitis
#4
Kathleen M Schieffer, Christine S Choi, Scott Emrich, Leonard Harris, Sue Deiling, Dipti M Karamchandani, Anna Salzberg, Yuka I Kawasawa, Gregory S Yochum, Walter A Koltun
Individuals with diverticula or outpouchings of the colonic mucosa and submucosa through the colonic wall have diverticulosis, which is usually asymptomatic. In 10-25% of individuals, the diverticula become inflamed, resulting in diverticulitis. Very little is known about the pathophysiology or gene regulatory pathways involved in the development of diverticulitis. To identify these pathways, we deep sequenced RNAs isolated from full-thickness sections of sigmoid colon from diverticulitis patients and control individuals...
June 15, 2017: American Journal of Physiology. Gastrointestinal and Liver Physiology
https://www.readbyqxmd.com/read/28596277/the-liver-in-regulation-of-iron-homeostasis
#5
Gautam Rishi, V Nathan Subramaniam
The liver is one of the largest and most functionally diverse organs in the human body. In addition to roles in detoxification of xenobiotics, digestion, synthesis of important plasma proteins, gluconeogenesis, lipid metabolism and storage, the liver also plays a significant role in iron homeostasis. Apart from being the storage site for excess body iron, it also plays a vital role in regulating the amount of iron released into the blood by enterocytes and macrophages. Since iron is essential for many important physiological and molecular processes, it increases the importance of liver in the proper functioning of the body's metabolism...
June 8, 2017: American Journal of Physiology. Gastrointestinal and Liver Physiology
https://www.readbyqxmd.com/read/28572086/functional-morphology-of-the-lower-esophageal-sphincter-and-crural-diaphragm-determined-by-3-d-high-resolution-pressure-profile-ct-imaging
#6
Ravinder K Mittal, Ali Zifan, Dushyant Kumar, Melissa Ledgerwood-Lee, Erika Ruppert, Gary Ghahremani
The lower esophageal sphincter (LES) and crural diaphragm (CD) provide the closure mechanism at esophago-gastric junction (EGJ). We used CT imaging in combination with 3D EGJ pressure recordings to determine the functional morphology of the LES and CD and its relationship to the EGJ anatomy. A 3D-HRM catheter recorded the EGJ pressure in 10 healthy subjects. A 0.5 mm diameter metal ball (BB) was taped to the catheter, adjacent to transducer #1. The EGJ pressure was recorded under following conditions; 1) end-expiration (LES pressure) a) before swallow, b) after swallow, and 2) peak inspiration (CD contraction) c) tidal inspiration and d) forced inspiration...
June 1, 2017: American Journal of Physiology. Gastrointestinal and Liver Physiology
https://www.readbyqxmd.com/read/28572085/cdx2-upregulates-slc26a3-gene-expression-in-intestinal-epithelial-cells
#7
Ishita Chatterjee, Anoop Kumar, Rosa Maria Castilla Madrigal, Oscar Pellon-Cardenas, Ravinder K Gill, Waddah A Alrefai, Alip Borthakur, Michael Verzi, Pradeep K Dudeja
SLC26A3 (Down Regulated in Adenoma, DRA) plays a key role in mammalian intestinal NaCl absorption via mediating apical membrane Cl(-)/HCO3(-) exchange. DRA function and expression are significantly decreased in diarrhea associated with inflammatory bowel diseases (IBD). DRA is also considered to be a marker of cellular differentiation, and is predominantly expressed in differentiated epithelial cells. Caudal type homeobox protein-2 (CDX2) is known to regulate genes involved in intestinal epithelial differentiation and proliferation...
June 1, 2017: American Journal of Physiology. Gastrointestinal and Liver Physiology
https://www.readbyqxmd.com/read/28572084/ductular-and-proliferative-response-of-esophageal-submucosal-glands-in-a-porcine-model-of-esophageal-injury-and-repair
#8
Leandi Krüger, Liara M Gonzalez, Tiffany A Pridgen, Shannon J McCall, Richard von Furstenberg, Ivan Harnden, Gwendolyn E Carnighan, Abigail M Cox, Anthony T Blikslager, Katherine Schuver Garman
Esophageal injury is a risk factor for diseases such as Barrett's Esophagus (BE) and Esophageal Adenocarcinoma. In order to improve understanding of signaling pathways associated with both normal and abnormal repair, animal models are needed. Traditional rodent models of esophageal repair are limited by the absence of esophageal submucosal glands (ESMGs), which are present in human esophagus. Previously, we identified acinar ductal metaplasia in human ESMGs in association with both esophageal injury and cancer...
June 1, 2017: American Journal of Physiology. Gastrointestinal and Liver Physiology
https://www.readbyqxmd.com/read/28572083/oatmeal-particle-size-alters-glycemic-index-but-not-as-a-function-of-gastric-emptying-rate
#9
Alan R Mackie, Balazs Bajka, Neil M Rigby, Peter J Wilde, Fatima Alves-Pereira, Ellen F Mosleth, Anne Rieder, Bente Kirkhus, Louise J Salt
SCOPE: The aim of this study was to determine the extent to which oat particle size in a porridge could alter glucose absorption, gastric emptying, gastrointestinal hormone response and subjective feelings of appetite and satiety. METHOD AND RESULTS: Porridge was prepared from either oat flakes or oat flour with the same protein, fat, carbohydrate and mass. These were fed to eight volunteers on separate days in a crossover study and subjective appetite ratings, gastric contents and plasma glucose, insulin, and gastrointestinal hormones were determined over a period of three hours...
June 1, 2017: American Journal of Physiology. Gastrointestinal and Liver Physiology
https://www.readbyqxmd.com/read/28546285/anti-inflammatory-effects-and-mechanisms-of-vagal-nerve-stimulation-combined-with-electroacupuncture-in-a-rodent-model-of-tnbs-induced-colitis
#10
Haifeng Jin, Jie Guo, Jiemin Liu, Bin Lyu, Robert D Foreman, Jieyun Yin, Zhaohong Shi, Jiande Dz Chen
The purpose of this study was to determine effects and mechanisms of vagal nerve stimulation (VNS) and additive effects of electroacupuncture (EA) on colonic inflammation in a rodent model of IBD. Chronic inflammation in rats was induced by intrarectal TNBS (2,4,6-Trinitrobenzenesulfonic acid). The rats were then treated with sham-ES (electrical stimulation), VNS or VNS+EA for 3 weeks. Inflammatory responses were assessed by disease activity index (DAI), macroscopic scores and histological scores of colonic tissues, and plasma levels of TNF-α, IL-1β and IL-6, myeloperoxidase (MPO) activity of colonic tissues...
May 25, 2017: American Journal of Physiology. Gastrointestinal and Liver Physiology
https://www.readbyqxmd.com/read/28546284/a-new-role-for-microbiota-dulling-the-thrust-of-serotonin-and-5ht3-signaling-cascade
#11
Eugene B Chang, Mrinalini C Rao
N/A.
May 25, 2017: American Journal of Physiology. Gastrointestinal and Liver Physiology
https://www.readbyqxmd.com/read/28546283/high-resolution-mapping-of-gastric-slow-wave-recovery-profiles-biophysical-model-methodology-and-demonstration-of-applications
#12
Niranchan Paskaranandavadivel, Leo K Cheng, Peng Du, Jack M Rogers, Gregory O'Grady
Slow waves play a central role in coordinating gastric motor activity. High-resolution mapping of extracellular potentials from the stomach provides spatiotemporal detail on normal and dysrhythmic slow-wave patterns. All mapping studies to date have focused exclusively on tissue activation; however, the recovery phase contains vital information on repolarization heterogeneity, the excitable gap, and refractory tail interactions, but has not been investigated. Here, we report a method to identify the recovery phase in slow-wave mapping data...
May 25, 2017: American Journal of Physiology. Gastrointestinal and Liver Physiology
https://www.readbyqxmd.com/read/28546282/disease-activity-in-eosinophilic-esophagitis-is-associated-with-impaired-esophageal-barrier-integrity
#13
Marijn J Warners, Bram D van Rhijn, Joanne Verheij, Andreas J P M Smout, Albert J Bredenoord
BACKGROUND: In eosinophilic esophagitis (EoE) the esophageal barrier integrity is impaired. Integrity can be assessed with different techniques. AIMS: To assess the correlations between esophageal eosinophilia and various measures of mucosal integrity, and to evaluate whether endoscopic impedance measurements can predict disease activity. METHODS: Endoscopies and mucosal integrity measurements were performed in adult EoE patients with active disease (≥15 eosinophils/HPF) at baseline (n=32), after fluticasone (n=15) and elemental dietary treatment (n=14) and in controls (n=19)...
May 25, 2017: American Journal of Physiology. Gastrointestinal and Liver Physiology
https://www.readbyqxmd.com/read/28526690/emerging-concepts-in-biliary-repair-and-fibrosis
#14
Luca Fabris, Carlo Spirli, Massimiliano Cadamuro, Romina Fiorotto, Mario Strazzabosco
Chronic diseases of the biliary tree (cholangiopathies) represent one of the major unmet needs in clinical hepatology and a significant knowledge gap in liver pathophysiology. The common theme in cholangiopathies is that the target of the disease is the biliary tree. After damage to the biliary epithelium, inflammatory changes stimulate a reparative response with proliferation of cholangiocytes and restoration of the biliary architecture, owing to the re-activation of a variety of morphogenetic signals. Chronic damage and inflammation, will ultimately result in pathologic repair, with generation of biliary fibrosis and clinical progression of the disease...
May 19, 2017: American Journal of Physiology. Gastrointestinal and Liver Physiology
https://www.readbyqxmd.com/read/28526689/long-non-coding-rna-neat1-promotes-hepatocellular-carcinoma-cell-proliferation-through-the-regulation-of-mir-129-5p-vcp-i%C3%AE%C2%BAb
#15
Luo Fang, Jiao Sun, Zongfu Pan, Yu Song, Like Zhong, Yiwen Zhang, Yujia Liu, Xiaowei Zheng, Ping Huang
BACKGROUND: Long non-coding RNA (lncRNA) nuclear-enriched abundant transcript 1 (NEAT1) plays an important role in the pathogenesis and development of several types of cancer. However, the functional mechanism of NEAT1 in hepatocellular carcinoma (HCC) remains unclear. METHODS: The NEAT1 and miR-129-5p expression in HCC tissues and cell lines were quantified by means of qPCR. The effects of NEAT1 expression inhibition or up-regulation in HCC cell lines were analyzed in terms of cell viability and apoptosis...
May 19, 2017: American Journal of Physiology. Gastrointestinal and Liver Physiology
https://www.readbyqxmd.com/read/28526688/loss-of-the-anion-exchanger-dra-slc26a3-or-pat1-slc26a6-alters-sulfate-transport-by-the-distal-ileum-and-overall-sulfate-homeostasis
#16
Jonathan M Whittamore, Marguerite Hatch
The ileum is considered the primary site of inorganic sulfate (SO4(2-)) absorption. In the present study, we explored the contributions of the apical chloride/bicarbonate (Cl(-)/HCO3(-)) exchangers DRA (Slc26a3), and PAT1 (Slc26a6), to the underlying transport mechanism. Transepithelial (35)SO4(2-) and (36)Cl(-) fluxes were determined across isolated, short-circuited segments of the distal ileum from wild-type (WT), DRA-knockout (KO) and PAT1-KO mice, together with measurements of urine and plasma sulfate. The WT distal ileum supported net sulfate absorption (197...
May 19, 2017: American Journal of Physiology. Gastrointestinal and Liver Physiology
https://www.readbyqxmd.com/read/28526687/ffa2-activation-combined-with-ulcerogenic-cox-inhibition-induces-duodenal-mucosal-injury-via-the-5-ht-pathway-in-rats
#17
Yasutada Akiba, Koji Maruta, Kazuyuki Narimatsu, Hyder Said, Izumi Kaji, Ayaka Kuri, Ken-Ichi Iwamoto, Atsukazu Kuwahara, Jonathan D Kaunitz
Serotonin (5-HT), predominantly synthesized and released by enterochromaffin cells, is implicated in gastrointestinal symptoms such as emesis, abdominal pain and diarrhea. Since luminal short-chain fatty acids (SCFAs) release 5-HT from enterochromaffin cells, which express the SCFA receptor FFA2 in rat duodenum, we examined the effects of the selective FFA2 agonist phenylacetamide-1 (PA1) on duodenal 5-HT release with consequent bicarbonate secretion (DBS) and on indomethacin (IND)-induced enteropathy. Intestinal injury was induced by IND (10 mg/kg, sc) with or without PA1...
May 19, 2017: American Journal of Physiology. Gastrointestinal and Liver Physiology
https://www.readbyqxmd.com/read/28495802/a-common-nhe3-single-nucleotide-polymorphism-has-normal-function-and-sensitivity-to-regulatory-ligands
#18
Jianyi Yin, Chung-Ming Tse, Boyoung Cha, Rafiqual Sarker, Xinjun C Zhu, Anna Walentinsson, Peter J Greasley, Mark Donowitz
Na(+)/H(+) exchanger NHE3 mediates the majority of intestinal and renal electroneutral sodium absorption. Dysfunction of NHE3 is associated with a variety of diarrheal diseases. We previously reported that the NHE3 gene (SLC9A3) has more than 400 single nucleotide polymorphisms (SNPs) but few non-synonymous polymorphisms. Among the latter, one polymorphism (rs2247114-G>A), which causes a substitution from arginine to cysteine at amino acid position 799 (p.R799C), is common in Asian populations. To improve our understanding of the population distribution and potential clinical significance of the NHE3-799C variant, we investigated the frequency of this polymorphism in different ethnic groups using bioinformatics analyses, and in a cohort of Japanese patients with cardiovascular or renal disease...
May 11, 2017: American Journal of Physiology. Gastrointestinal and Liver Physiology
https://www.readbyqxmd.com/read/28473332/cd151-supports-vcam-1-mediated-lymphocyte-adhesion-to-liver-endothelium-and-is-upregulated-in-chronic-liver-disease-and-hepatocellular-carcinoma
#19
James C R Wadkin, Daniel A Patten, Sivesh Kamarajah, Emma L Shepherd, Vera Novitskaya, Fedor Berditchevski, David H Adams, Chris J Weston, Shishir Shetty
CD151, a member of the tetraspanin family of receptors, is a lateral organizer and modulator of activity of several families of transmembrane proteins. It has been implicated in the development and progression of several cancers but its role in chronic inflammatory disease is less well understood. Here we show that CD151 is up-regulated by distinct microenvironmental signals in a range of chronic inflammatory liver diseases and in primary liver cancer where it supports lymphocyte recruitment. CD151 was highly expressed in endothelial cells of the hepatic sinusoids and neovessels developing in fibrotic septa and tumour margins...
May 4, 2017: American Journal of Physiology. Gastrointestinal and Liver Physiology
https://www.readbyqxmd.com/read/28473331/the-emerging-role-of-mast-cells-in-liver-disease
#20
Veronica Jarido, Lindsey Kennedy, Laura Hargrove, Jennifer Demieville, Joanne Thomson, Kristen Stephenson, Heather Francis
The depth of our knowledge regarding mast cells has widened exponentially in the last 20 years. Once thought to be only important for allergy-mediated events, mast cells are now recognized to be important regulators of a number of pathological diseases. The revelation that mast cells can influence organs, tissues, and cells has increased interest in mast cell research during liver disease. The purpose of this review is to refresh the reader on the development, type, and location of mast cells and to review recent work that demonstrates the role of hepatic mast cells during diseased states...
May 4, 2017: American Journal of Physiology. Gastrointestinal and Liver Physiology
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