Project description:From 1997 to 1999 seven isolates of Campylobacter-like organisms from five patients that were exhibiting symptoms of gastroenteritis, including fever, stomach malaise, and diarrhea, were investigated. The organisms were isolated from stool samples and found to exhibit a diverse colony morphology; hence multiple isolates were submitted from one of the patients. All isolates were found to be identical. The organisms were catalase, urease, alkaline phosphatase, and nitrate negative but oxidase and indoxyl acetate positive. They grew at 37 degrees C but not at 42 degrees C, and three of the isolates from two different patients were sensitive to nalidixic acid and cephalothin. Full 16S rRNA sequence analysis not only grouped these organisms within the Helicobacter genus but also differentiated them from previously identified Helicobacter species. The closest relative by phylogenetic analysis was Helicobacter sp. flexispira taxon 1. Electron microscopy showed that these isolates had one or two bipolar flagella; however, the periplasmic fibers, a characteristic of the known Helicobacter sp. flexispira taxa, were not observed. The present isolates also lacked a flagellar sheath, a trait shared with four other Helicobacter spp., H. canadensis, H. mesocricetorum, H. pullorum, and H. rodentium. On the basis of the unique phenotypic properties of these isolates and 16S rRNA sequence analysis, we propose the classification of a new Helicobacter species, Helicobacter winghamensis sp. nov.
Project description:The files in this archive examine six species within the genus Helicobacter to assay their histidine-rich proteins. They correspond to the manuscript "Expansion of nickel binding- and histidine-rich proteins during gastric adaptation of Helicobacter species" by Frederic Fischer, Egor Vorontsov, Evelyne Turlin, Christian Malosse, Camille Garcia, David L. Tabb, Julia Chamot-Rooke, Riccardo Percudani, Daniel Vinella and Hilde De Reuse.
The sequence databases for the Helicobacter species are based on reference or complete UniProt proteomes in FASTA format, supplemented with reannotations of Hpn and Hpn2 protein products.
The full list of RAW files, including their attribution to individual species and the type of experiment they represent, can be found in RAWs-Readme. We have included QuaMeter IDFree metrics to include basic statistics such as length of LC gradient, the number of MS/MS scans, etc.
Project description:Helicobacter pylori (H. pylori) is a human pathogen that infects almost half of the world’s population. Infection with H. pylori is frequently associated with chronic gastritis and can even lead to gastric and duodenal ulcers and gastric cancer. Although the persistent colonization of H. pylori and the development of H. pylori-associated gastritis remain poorly understood, it is believed that, in gastric mucosa, the modulated gastric epithelial cells (GECs) by H. pylori are key contributors. We used microarrays to detail the global programme of gene expression in Helicobacter pylori infected-gastric epithelial cell line AGS cells and identified up-regulated genes induced by Helicobacter pylori infection.
Project description:We are now trying to elucidate the mechanism of Helicobacter-induced gastritis and gastric cancer. To identify genes involved in these Helicobacter-associated diseases, we infected Helicobacter felis to INS-GAS (insulin-gastrin transgenic) mice (C57BL/6 background) which shows accelerated development of gastritis and gastric cancer.
Project description:Interventions: Helicobacter pylori eradication (Lansoprazole60mg/day, AMPC1500mg/day,CAM800mg/day for 7 days)
Primary outcome(s): Aberrant crypt foci (ACF) assesment at pre and post Helicobacter pylori eradication
Study Design: Single arm Non-randomized
