Helicobacter pylori
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA122881 | ENA |
REPOSITORIES: ENA
Similar Datasets
Project description:This SuperSeries is composed of the following subset Series: GSE16390: Response of gastric epithelial progenitors to H. pylori isolates from Swedish patients with chronic atrophic gastritis 1 GSE16439: Response of gastric epithelial progenitors to H. pylori isolates from Swedish patients with chronic atrophic gastritis 2 Refer to individual Series
2009-10-26 | E-GEOD-16440 | biostudies-arrayexpress
Project description:Helicobacter pylori clinical isolates can establish themselves in gastric epithelial stem cells and this interaction may have implications for gastric tumorigenesis. Mouse gastric epithelial progenitor cells (mGEPs) and non-progenitor gastric epithelial cells (npGECs) were infected for 24hrs with Helicobacter pylori clinical isolates Kx1 and Kx2. Kx1 was isolated from a patient with chronic atrophic gastritis (ChAG) and Kx2 from the same patient 4 years later, when he progressed to gastric adenocarcinoma. Keywords: RNA Expression Array
2008-02-22 | GSE10262 | GEO
Project description:Helicobacter pylori clinical isolates can establish themselves in gastric epithelial stem cells and this interaction may have implications for gastric tumorigenesis. Mouse gastric epithelial progenitor cells (mGEPs) were infected for 24hrs with Helicobacter pylori clinical isolates Kx1 and Kx2. Kx1 and Kx2 were also grown in cell media in the absence of cells. Kx1 was isolated from a patient with chronic atrophic gastritis (ChAG) and Kx2 from the same patient 4 years later, when he progressed to gastric adenocarcinoma. Keywords: RNA Expression Array
2008-02-22 | GSE10261 | GEO
Project description:Helicobacter pylori colonization of the human stomach is a strong risk factor for gastric cancer. To investigate H. pylori-induced gastric molecular alterations, we used a Mongolian gerbil model of gastric carcinogenesis. Histologic evaluation revealed varying levels of atrophic gastritis (a premalignant condition characterized by parietal and chief cell loss) in H. pylori-infected animals, and transcriptional profiling revealed a loss of markers for these cell types. We then assessed the spatial distribution and relative abundance of proteins in the gastric tissues using imaging mass spectrometry and liquid chromatography with tandem mass spectrometry (LC-MS/MS). We detected striking differences in protein content of corpus and antrum tissues. 492 proteins were preferentially localized to the corpus in uninfected animals. The abundance of 91 of these proteins was reduced in H. pylori-infected corpus tissues exhibiting atrophic gastritis compared to infected corpus tissues with non-atrophic gastritis or uninfected corpus tissues; these included numerous proteins with metabolic functions. Fifty proteins localized to the corpus in uninfected animals were diffusely delocalized throughout the stomach in infected tissues with atrophic gastritis; these included numerous proteins with roles in protein processing. Corresponding alterations were not detected in animals infected with a H. pylori ∆cagT mutant (lacking Cag type IV secretion system activity). These results indicate that H. pylori can cause loss of proteins normally localized to the gastric corpus as well as diffuse delocalization of corpus-specific proteins, resulting in marked changes in the normal gastric molecular partitioning into distinct corpus and antrum regions.
2023-12-04 | PXD046333 | Pride
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.
2024-04-18 | GSE264263 | GEO
Project description:Helicobacter pylori clinical isolates can establish themselves in gastric epithelial stem cells and this interaction may have implications for gastric tumorigenesis. Mouse gastric epithelial progenitor cells (mGEPs) were infected for 24hrs with Helicobacter pylori clinical isolates Kx1 and Kx2. Kx1 and Kx2 were also grown in cell media in the absence of cells. Kx1 was isolated from a patient with chronic atrophic gastritis (ChAG) and Kx2 from the same patient 4 years later, when he progressed to gastric adenocarcinoma. Keywords: RNA Expression Array H. pylori strains Kx1 or Kx2 that had been grown to log phase were used to infect mGEP cells.. After 24h, media and non-attached bacteria were washed off and the cells harvested by trypsinization. RNA was prepared from bacteria infecting mGEP cells or bacterial cultures of Kx1 and Kx2 grown in cell media for 24h in the absence of mGEP cells.
2010-05-26 | E-GEOD-10261 | biostudies-arrayexpress
Project description:Helicobacter pylori clinical isolates can establish themselves in gastric epithelial stem cells and this interaction may have implications for gastric tumorigenesis. Mouse gastric epithelial progenitor cells (mGEPs) and non-progenitor gastric epithelial cells (npGECs) were infected for 24hrs with Helicobacter pylori clinical isolates Kx1 and Kx2. Kx1 was isolated from a patient with chronic atrophic gastritis (ChAG) and Kx2 from the same patient 4 years later, when he progressed to gastric adenocarcinoma. Experiment Overall Design: mGEPs and npGECs were seeded and grown to 70% confluency in RPMI1640 medium supplemented with 10% FBS before being infected with H. pylori strains Kx1 or Kx2 that had been grown to log phase. After 24h, media and non-attached bacteria were washed off and the cells harvested by trypsinization. RNA was prepared from triplicate cultures of mGEP cells infected with Kx1 or Kx2, npGECs infected with Kx1 or Kx2 and uninfected mGEPs and npGECs that served as controls.
2008-04-07 | E-GEOD-10262 | biostudies-arrayexpress
Project description:Helicobacter pylori infection reprograms host gene expression and influences various cellular processes, which have been investigated by cDNA microarray in vitro culture cells and in vivo patients of the chronic abdominal complaint. In this study，the effects of H. pylori infection on host gene expression in the gastric antral mucosa of patients with chronic gastritis were examined. The gastric antral mucosa was obtained from a total of 6 untreated patients undergoing gastroscopic and pathologic confirmation of chronic superficial gastritis. Three patients infected by H. pylori and 3 patients uninfected were used to cDNA microarray experiment.
2012-04-29 | E-GEOD-30042 | biostudies-arrayexpress
Project description:The majority of gastric cancer cases are believed to be caused by chronic infection with the bacterium Helicobacter pylori, and atrophic corpus gastritis is a predisposing condition to gastric cancer development. We aimed to increase understanding of the molecular details of atrophy by performing a global transcriptome analysis of stomach tissue. Biopsies from patients with different stages of H. pylori infection were taken from both the antrum and corpus mucosa and analyzed on microarrays. The stages included patients without current H. pylori infection, H. pylori-infected without corpus atrophy and patients with current or past H. pylori-infection with corpus-predominant atrophic gastritis.Using clustering and integrated analysis, we found firm evidence for antralization of the corpus mucosa of atrophy patients. This antralization harbored gain of gastrin expression, as well as loss of expression of corpus-related genes, such as genes associated with acid production, energy metabolism and blood clotting. The analyses provided detailed molecular evidence for simultaneous intestinal metaplasia (IM) and spasmolytic polypeptide expressing metaplasia (SPEM) in atrophic corpus tissue. Finally, acidic mammalian chitinase, a chitin-degrading enzyme produced by chief cells, was shown to be strongly down-regulated in corpus atrophy.Transcriptome analysis revealed several gene groups which are related to development of corpus atrophy, some of which were increased also in H. pylori-infected non-atrophic patients. Furthermore, loss of acidic chitinase expression is a promising marker for corpus atrophy. Biopsies from well classified patients with different stages of H. pylori infection were taken from both the antrum and corpus mucosa. These stages included H. pylori un-infected, H. pylori-infected without corpus atrophy and H. pylori-infected with corpus-predominant atrophic gastritis.
2014-02-04 | E-GEOD-27411 | biostudies-arrayexpress
Project description:Helicobacter pylori infection reprograms host gene expression and influences various cellular processes, which have been investigated by cDNA microarray in vitro culture cells and in vivo patients of the chronic abdominal complaint. In this study，the effects of H. pylori infection on host gene expression in the gastric antral mucosa of patients with chronic gastritis were examined.
2012-04-30 | GSE30042 | GEO