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Intragastric pH

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https://www.readbyqxmd.com/read/28407418/pharmacokinetics-and-acid-suppressant-efficacy-of-esomeprazole-after-intravenous-oral-and-subcutaneous-administration-to-healthy-beagle-dogs
#1
J-H Hwang, J-W Jeong, G-H Song, T-S Koo, K-W Seo
BACKGROUND: Esomeprazole is an S-enantiomer of omeprazole that has favorable pharmacokinetics and efficacious acid suppressant properties in humans. However, the pharmacokinetics and effects on intragastric pH of esomeprazole in dogs have not been reported. OBJECTIVE: To determine the pharmacokinetics of esomeprazole administered via various routes (PK study) and to investigate the effect of esomeprazole on intragastric pH with a Bravo pH monitoring system (PD study)...
April 13, 2017: Journal of Veterinary Internal Medicine
https://www.readbyqxmd.com/read/28395823/gastric-toxicity-involving-alterations-of-gastritis-related-protein-expression-in-mice-following-long-term-exposure-to-nano-tio2
#2
Fashui Hong, Nan Wu, Yingjun Zhou, Li Ji, Ting Chen, Ling Wang
Nano TiO2 has been widely used in food industry as a coloring agent, whether the application has adverse effects on stomach for humans and animals is rarely concerned. This study determined whether intragastric administration with nano TiO2 every day for nine months cause gastric damages and dysfunction, and is associated with changes of stomach damage-related protein expression in mice. Our results suggested that nano TiO2 exposure resulted in significant titanium accumulation in the stomach, reductions in daily food intake and water intake, stomach weight, and stomach indices...
May 2017: Food Research International
https://www.readbyqxmd.com/read/28387464/a-novel-ph-controlled-hydrogen-sulfide-donor-protects-gastric-mucosa-from-aspirin-induced-injury
#3
Chun-Tao Yang, Zhen-Zhen Lai, Ze-Hang Zheng, Jian-Ming Kang, Ming Xian, Rui-Yu Wang, Kun Shi, Fu-Hui Meng, Xiang Li, Li Chen, Hui Zhang
Hydrogen sulphide (H2 S) serves as a vital gastric mucosal defence under acid condition. Non-steroidal anti-inflammatory drugs (NSAIDs) are among widely prescribed medications with effects of antipyresis, analgesia and anti-inflammation. However, their inappropriate use causes gastric lesions and endogenous H2 S deficiency. In this work, we reported the roles of a novel pH-controlled H2 S donor (JK-1) in NSAID-related gastric lesions. We found that JK-1 could release H2 S under mild acidic pH and increase solution pH value...
April 7, 2017: Journal of Cellular and Molecular Medicine
https://www.readbyqxmd.com/read/28363598/p-p-methoxyl-diphenyl-diselenide-loaded-polymeric-nanocapsules-are-chemically-stable-and-do-not-induce-toxicity-in-mice
#4
Marcel Henrique Marcondes Sari, Luana Mota Ferreira, Vanessa Angonesi Zborowski, Paulo Cesar Oliveira Araujo, Verônica Ferrari Cervi, César Augusto Brüning, Letícia Cruz, Cristina Wayne Nogueira
Organoselenium compounds have been targeted to new therapeutic tools development due to their pharmacological actions. However, some toxicity issues and physicochemical limitations delay the clinical application of these compounds. The incorporation of organoselenium molecules into nanostructured systems arises as a promising alternative to overcome such restrictions. The current study proposed the characterization of the polymeric nanocapsules of p,p'-methoxyl-diphenyl diselenide [(OMePhSe)2] as well as the evaluation of the in vivo toxicity and biodistribution profile...
March 28, 2017: European Journal of Pharmaceutics and Biopharmaceutics
https://www.readbyqxmd.com/read/28279347/helicobacter-pylori-adapts-to-chronic-infection-and-gastric-disease-via-ph-responsive-baba-mediated-adherence
#5
Jeanna A Bugaytsova, Oscar Björnham, Yevgen A Chernov, Pär Gideonsson, Sara Henriksson, Melissa Mendez, Rolf Sjöström, Jafar Mahdavi, Anna Shevtsova, Dag Ilver, Kristof Moonens, Macarena P Quintana-Hayashi, Roman Moskalenko, Christopher Aisenbrey, Göran Bylund, Alexej Schmidt, Anna Åberg, Kristoffer Brännström, Verena Königer, Susanne Vikström, Lena Rakhimova, Anders Hofer, Johan Ögren, Hui Liu, Matthew D Goldman, Jeannette M Whitmire, Jörgen Ådén, Justine Younson, Charles G Kelly, Robert H Gilman, Abhijit Chowdhury, Asish K Mukhopadhyay, G Balakrish Nair, Konstantinos S Papadakos, Beatriz Martinez-Gonzalez, Dionyssios N Sgouras, Lars Engstrand, Magnus Unemo, Dan Danielsson, Sebastian Suerbaum, Stefan Oscarson, Ludmilla A Morozova-Roche, Anders Olofsson, Gerhard Gröbner, Jan Holgersson, Anders Esberg, Nicklas Strömberg, Maréne Landström, Angela M Eldridge, Brett A Chromy, Lori M Hansen, Jay V Solnick, Sara K Lindén, Rainer Haas, Andre Dubois, D Scott Merrell, Staffan Schedin, Han Remaut, Anna Arnqvist, Douglas E Berg, Thomas Borén
The BabA adhesin mediates high-affinity binding of Helicobacter pylori to the ABO blood group antigen-glycosylated gastric mucosa. Here we show that BabA is acid responsive-binding is reduced at low pH and restored by acid neutralization. Acid responsiveness differs among strains; often correlates with different intragastric regions and evolves during chronic infection and disease progression; and depends on pH sensor sequences in BabA and on pH reversible formation of high-affinity binding BabA multimers. We propose that BabA's extraordinary reversible acid responsiveness enables tight mucosal bacterial adherence while also allowing an effective escape from epithelial cells and mucus that are shed into the acidic bactericidal lumen and that bio-selection and changes in BabA binding properties through mutation and recombination with babA-related genes are selected by differences among individuals and by changes in gastric acidity over time...
March 8, 2017: Cell Host & Microbe
https://www.readbyqxmd.com/read/28267445/abdominal-compression-by-waist-belt-aggravates-gastroesophageal-reflux-primarily-by-impairing-esophageal-clearance
#6
David R Mitchell, Mohammad H Derakhshan, Angela A Wirz, Stuart A Ballantyne, Kenneth E L McColl
BACKGROUND & AIMS: Central obesity promotes gastroesophageal reflux and this may be related to increased intra-abdominal pressure. We investigated the effect of increasing abdominal pressure by waist belt on reflux in patients with reflux disease. METHODS: We performed a prospective study of patients with esophagitis (n=8) or Barrett's esophagus (n=6); their median age was 56 years and their median body mass index, 26.8. Proton pump inhibitors were stopped at least 7 days before the study and H2 receptor antagonists were stopped for at least 24 hours before...
March 3, 2017: Gastroenterology
https://www.readbyqxmd.com/read/28258834/the-effect-of-omeprazole-treatment-on-the-gut-microflora-and-neutrophil-function
#7
Maja Kostrzewska, Agnieszka Świdnicka-Siergiejko, Dorota Olszańska, Grażyna Jurkowska, Marzena Garley, Wioletta Ratajczak-Wrona, Ewa Jabłońska, Jacek Jamiołkowski, Andrzej Dabrowski
BACKGROUND AND AIM: Proton pump inhibitors (PPIs) may increase the risk of Clostridium difficile infections. There are interactions between gut microbiota and innate immune cells including neutrophils. We evaluated the effect of treatment with omeprazole on the gut microflora and neutrophil function. METHODS: In 50 patients, we evaluated the effect of 4-week omeprazole treatment (n=25 with 20mg per day and n=25 with 20mg twice daily) on intragastric pH, results of stool culture and lactulose hydrogen breath test (LHBT) and neutrophil function...
March 1, 2017: Clinics and Research in Hepatology and Gastroenterology
https://www.readbyqxmd.com/read/28214603/the-impact-of-reduced-gastric-acid-secretion-on-dissolution-of-salts-of-weak-bases-in-the-fasted-upper-gastrointestinal-lumen-data-in-biorelevant-media-and-in-human-aspirates
#8
Chara Litou, Maria Vertzoni, Wei Xu, Filippos Kesisoglou, Christos Reppas
PURPOSE: To propose media for simulating the intragastric environment under reduced gastric acid secretion in the fasted state at three levels of simulation of the gastric environment and evaluate their usefulness in evaluating the intragastric dissolution of salts of weak bases. To evaluate the importance of bicarbonate buffer in biorelevant in vitro dissolution testing when using Level II biorelevant media simulating the environment in the fasted upper small intestine, regardless of gastric acid secretions...
February 15, 2017: European Journal of Pharmaceutics and Biopharmaceutics
https://www.readbyqxmd.com/read/28207313/continuous-radiotelemetric-monitoring-of-intragastric-ph-in-a-dog-with-peptic-ulceration
#9
Michael B Lane, Jeanne C Larson, Jennifer E Stokes, M Katherine Tolbert
CASE DESCRIPTION A 6-year-old castrated male Boxer was evaluated for a 5-week history of frequent vomiting, melena, and signs of abdominal pain following accidental ingestion of 5 to ten 15-mg meloxicam tablets (approx ingested dose, 3.1 to 6.2 mg/kg [1.4 to 2.8 mg/lb]). CLINICAL FINDINGS Clinical signs persisted despite 3 weeks of treatment with sucralfate (41.8 mg/kg [19 mg/lb], PO, q 8 h) and omeprazole (0.8 mg/kg [0.36 mg/lb], PO, q 24 h). Results of a CBC and serum biochemical analysis were unremarkable...
March 1, 2017: Journal of the American Veterinary Medical Association
https://www.readbyqxmd.com/read/28163290/gastric-neuroendocrine-tumor-with-hypergastrinemia-following-type-b-chronic-atrophic-gastritis-a-case-report
#10
Eriko Yamaguchi, Tsutomu Iwasa, Eikichi Ihara, Yosuke Tomita, Akira Aso, Eiji Oki, Kayoko Nakano, Minako Hirahashi, Kazuhiko Nakamura
A man in his 60s was referred to our institution for the evaluation of a gastric neuroendocrine tumor (G-NET) located in the fornix and that measured 13mm in size. Blood test results revealed hypergastrinemia (up to 3376pg/ml). Additional tests, including esophagogastroduodenoscopy, computed tomography, and intragastric pH monitoring, indicated that hypergastrinemia was not associated with type A autoimmune gastritis or gastrinoma. The patient was positive for the immunoglobulin G antibody against Helicobacter pylori, suggesting type B chronic atrophic gastritis as the cause for the condition...
2017: Nihon Shokakibyo Gakkai Zasshi, the Japanese Journal of Gastro-enterology
https://www.readbyqxmd.com/read/28161707/pathogenesis-of-double-dose-proton-pump-inhibitor-resistant-non-erosive-reflux-disease-and-mechanism-of-reflux-symptoms-and-gastric-acid-secretion-suppressive-effect-in-the-presence-or-absence-of-helicobacter-pylori-infection
#11
Noriyuki Kawami, Nana Takenouchi, Mariko Umezawa, Shintaro Hoshino, Yuriko Hanada, Yoshimasa Hoshikawa, Hirohito Sano, Yoshio Hoshihara, Tsutomu Nomura, Eiji Uchida, Katsuhiko Iwakiri
BACKGROUND: Various mechanisms have been suggested to be responsible for contributing to the occurrence of proton pump inhibitor (PPI)-resistant non-erosive reflux disease (NERD). The aims of this study were to clarify the pathogenesis of PPI-resistant NERD. METHODS: Fifty-three patients with NERD, who had persistent reflux symptoms despite taking double-dose PPI, were included in this study. After excluding eosinophilic esophagitis (EoE) and primary esophageal motility disorder, esophageal impedance-pH monitoring was carried out...
2017: Digestion
https://www.readbyqxmd.com/read/28138748/safety-tolerability-pharmacokinetics-and-pharmacodynamics-of-dexlansoprazole-injection-in-healthy-chinese-subjects
#12
Yue-Qi Li, Zheng-Yu Yan, Hong-Wen Zhang, Lu-Ning Sun, Hui-Wen Jiao, Mei-Feng Wang, Li-Yuan Yu, Lei Yu, Zi-Qing-Yun Yuan, Ling Meng, Yong-Qing Wang
PURPOSE: This study was conducted to evaluate the safety, tolerability, pharmacokinetics and pharmacodynamics of dexlansoprazole injection in healthy subjects. METHODS: Dexlansoprazole (20-90 mg) or lansoprazole (30 mg) was administrated intravenously to healthy male and female volunteers. All the subjects were sampled for pharmacokinetic (PK) analysis and 64 of them were monitored for 24-h intragastric pH prior to and after administration in the pharmacodynamic (PD) study...
January 31, 2017: European Journal of Clinical Pharmacology
https://www.readbyqxmd.com/read/28125347/gastric-mixing-during-food-digestion-mechanisms-and-applications
#13
Gail M Bornhorst
Gastric mixing is a complex process that is governed by meal properties, such as food buffering capacity, physical properties, and the rate of breakdown as well as physiological factors, such as the rate of gastric secretions, gastric emptying, and gastric motility. Gastric mixing processes have been studied through the use of experimental and computational methods. Gastric mixing impacts the intragastric pH distribution and residence time in the stomach for ingested materials. Development of a fundamental understanding of the advective and diffusion processes and their roles in gastric mixing will be important in furthering our understanding of food breakdown, microbial survival, and drug dissolution during gastric digestion...
February 28, 2017: Annual Review of Food Science and Technology
https://www.readbyqxmd.com/read/28111929/acid-inhibitory-effect-of-a-combination-of-omeprazole-and-sodium-bicarbonate-cdfr0209-compared-with-delayed-release-omeprazole-40%C3%A2-mg-alone-in-healthy-adult-male-subjects
#14
Kyu-Nam Kim, Sung-Won Yang, Hyunil Kim, Seong Shin Kwak, Young-Sang Kim, Doo-Yeoun Cho
CDFR0209, a combination of an immediate-release formulation of omeprazole 40 mg and sodium bicarbonate 1100 mg, has been developed to treat acid-related disorders. We compared the acid inhibitory effects of CDFR0209 and delayed-release omeprazole (omeprazole-DR, Losec 40 mg) after repeated dosing in Helicobacter pylori-negative healthy adult male subjects. In this 2-period crossover study, 30 subjects were randomized to CDFR0209 or omeprazole-DR daily for 7 days. An ambulatory continuous 24-hour intragastric pH recording was performed at baseline and on days 1 and 7 of each administration period...
January 23, 2017: Clinical Pharmacology in Drug Development
https://www.readbyqxmd.com/read/28101705/tyrosine-kinase-inhibitors-and-proton-pump-inhibitors-an-evaluation-of-treatment-options
#15
Roelof W F van Leeuwen, Frank G A Jansman, Nicole G Hunfeld, Robert Peric, Anna K L Reyners, Alex L T Imholz, Jacobus R B J Brouwers, Joachim G Aerts, Teun van Gelder, Ron H J Mathijssen
Tyrosine kinase inhibitors (TKIs) have rapidly become an established factor in oncology, and have been shown to be effective in a wide variety of solid and hematologic malignancies. Use of the oral administration route of TKIs offers flexibility and is convenient for the patient; however, despite these advantages, the oral route of administration also causes a highly relevant new problem. Acid-inhibitory drugs, such as proton pump inhibitors (PPIs), increase the intragastric pH, which may subsequently decrease TKI solubility, bioavailability, and treatment efficacy...
January 18, 2017: Clinical Pharmacokinetics
https://www.readbyqxmd.com/read/27928793/-subtype-classification-and-clinicopathological-characteristics-of-gastric-neuroendocrine-neoplasms-an-analysis-of-241-cases
#16
Pan Zhang, Yu Zhang, Chi Zhang, Yanfen Shi, Jixi Liu, Qing Liu, Lili Yu, Miao Wang, Guoming Zou, Jie Lou, Jie Chen, Huangying Tan
OBJECTIVE: To study subtype classification of gastric neuroendocrine neoplasm (NEN) and their clinicopathological characteristics in order to provide reference for clinical practice. METHODS: Clinicopathological data of 241 gastric NEN patients (174 cases from China-Japan Friendship Hospital and 67 cases from The First Affiliated Hospital of Sun Yat-Sen University) between January 2011 and June 2016 were retrospectively summarized. According to serum gastrin, 24-hour intragastric pH monitoring and pathological grade, patients with gastric NEN were divided into 4 types: type I( (hypergastrinemia and achlorhydria, related to autoimmune chronic atrophic gastritis), type II( [hypergastrinemia and Zollinger-Ellison syndrome, related to gastrinoma or multiple endocrine neoplasia type I( (MEN-I()], type III( (sporadic disease with normal serum gastrin level), and type IIII( [poorly differentiated gastric neuroendocrine carcinoma (NEC) and mixed adenoneuroendocrine carcinoma (MANEC)]...
November 25, 2016: Zhonghua Wei Chang Wai Ke za Zhi, Chinese Journal of Gastrointestinal Surgery
https://www.readbyqxmd.com/read/27916213/gastric-ph-and-therapeutic-responses-to-exsomeprazole-in-patients-with-functional-dyspepsia-potential-clinical-implications
#17
Marek Majewski, Irene Sarosiek, Chad J Cooper, Grzegorz Wallner, Richard W McCallum, Stanley A Edlavitch, Jerzy Sarosiek
BACKGROUND: Therapy for functional dyspepsia remains a challenge. This study aimed to evaluate esomeprazole (E) versus placebo (P) regarding (1) the effectiveness in providing relief of abdominal pain or discomfort during 16 weeks of therapy in patients with functional dyspepsia having moderate or severe symptoms; (2) the effects on gastric acid suppression and (3) the relationship between symptom relief and gastric pH. METHODS: Enrolled patients were randomized to E (n = 38) or P (n = 35) in a double-blind, placebo-controlled trial...
December 2016: American Journal of the Medical Sciences
https://www.readbyqxmd.com/read/27906465/repeated-famotidine-administration-results-in-a-diminished-effect-on-intragastric-ph-in-dogs
#18
M K Tolbert, A Graham, A Odunayo, J Price, J M Steiner, K Newkirk, S Hecht
BACKGROUND: Famotidine is an acid suppressant commonly administered to dogs. Prolonged famotidine use in people results in decreased efficacy, but the effect in dogs is unknown. HYPOTHESIS/OBJECTIVES: To compare the effect of repeated oral administration of famotidine or placebo on intragastric pH and serum gastrin in dogs. We hypothesized that famotidine would have a diminished effect on intragastric pH on day 13 compared to day 1. ANIMALS: Six healthy adult colony Beagles...
January 2017: Journal of Veterinary Internal Medicine
https://www.readbyqxmd.com/read/27875488/esomeprazole-fda-approval-in-children-with-gerd-exposure-matching-and-exposure-response
#19
Justin C Earp, Nitin Mehrotra, Kristina E Peters, Robert P Fiorentino, Donna Griebel, Sue Chih Lee, Andrew Mulberg, Kerstin Röhss, Marie Sandström, Amy Taylor, Christoffer W Tornøe, Erica L Wynn, Jan-Stefan Van der Walt, Christine Garnett
OBJECTIVES: FDA approval of proton-pump inhibitors for infantile GERD has been limited by intra-patient variability in the clinical assessment of GERD. For children 1-17 years old, extrapolating efficacy from adults for IV esomeprazole was accepted. The oral formulation was previously approved in children. Exposure-response and exposure matching analyses were sought to identify approvable pediatric doses. METHODS: Intragastric pH biomarker comparisons between children and adults were conducted...
November 19, 2016: Journal of Pediatric Gastroenterology and Nutrition
https://www.readbyqxmd.com/read/27803732/bioavailability-safety-and-pharmacodynamics-of-delayed-release-dexlansoprazole-administered-as-two-30-mg-orally-disintegrating-tablets-or-one-60-mg-capsule
#20
Michael Kukulka, Sai Nudurupati, Maria Claudia Perez
BACKGROUND: Dual delayed-release dexlansoprazole is approved for use in adults as a 30 mg orally disintegrating tablet (ODT) or as 30 mg and 60 mg capsules. The pharmacokinetics, pharmacodynamics, and safety profile of two dexlansoprazole 30 mg ODTs were compared with one dexlansoprazole 60 mg capsule in this randomized, phase I, open-label, single-center, multiple-dose, two-period crossover study. METHODS: Participants were randomized in one of two treatment sequences, each comprised two 5-day treatment periods during which two dexlansoprazole 30 mg ODTs or one 60 mg capsule was administered once daily...
November 2016: Therapeutic Advances in Gastroenterology
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