Genome-wide DNA methylation analysis of gastric mucosa with autoimmune gastritis
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PROVIDER: PRJNA741508 | ENA |
REPOSITORIES: ENA
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Project description:DNA methylation in gastric mucosa with autoimmune gastritis and H. pylori-associated gastritis and normal gastric mucosa
2022-01-26 | GSE178925 | GEO
Project description:In this study, we aimed to reveal whether gastric mucosa with AIG has a specific gene expression profile, involving in its histology and chronic inflammation. To approach this, we performed comprehensive analysis of gene expression using gastric mucosa with atuoimmune gastritis, that with H. pylori-associated gastritis and healthy mucosa without any inflammation. Potential mechanisms of the gene expression changes in gastric mucosa with AIG were also explored.
2024-01-01 | GSE233973 | GEO
Project description:Comprehensive gene expression analysis using gastric mucosa with autoimmune gastritis
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Project description:Background & Aims: The association between chronic inflammation and gastric carcinogenesis is well established, but it is not clear how immune cells and cytokines regulate this process. We investigated the role of interleukin 27 (IL27) in the development of gastric atrophy, hyperplasia, and metaplasia (preneoplastic lesions associated with inflammation-induced gastric cancer) in mice with autoimmune gastritis. Methods: We performed studies with TxA23 mice (control mice), which express a T-cell receptor against the H+/K+ adenosine triphosphatase α chain and develop autoimmune gastritis, and TxA23xEbi3-/- mice, which develop gastritis but do not express IL27. In some experiments, mice were given high-dose tamoxifen to induce parietal cell atrophy and spasmolytic polypeptide-expressing metaplasia (SPEM). Recombinant IL27 was administered to mice with mini osmotic pumps. Stomachs were collected and analyzed by histopathology and immunofluorescence; we used flow cytometry to measure IL27 and identify immune cells that secrete IL27 in the gastric mucosa. Single-cell RNA sequencing was performed on immune cells that infiltrated stomach tissues. Results: We identified IL27-secreting macrophages and dendritic cell in the corpus of mice with chronic gastritis (TxA23 mice). Mice deficient in IL27 developed more severe gastritis, atrophy, and SPEM than control mice. Administration of recombinant IL27 significantly reduced the severity of inflammation, atrophy, and SPEM in mice with gastritis. Single-cell RNA sequencing showed that IL27 acted almost exclusively on stomach-infiltrating CD4+ T cells to suppress expression of inflammatory genes. Conclusions: In studies of mice with autoimmune gastritis, we found that IL27 is an inhibitor of gastritis and SPEM, suppressing CD4+ T-cell–mediated inflammation in the gastric mucosa.
2024-10-01 | GSE278552 | GEO
Project description:We used 10X 5' single cell RNA sequencing (scRNAseq) technology to examine the transcriptional profiles of distinct gastric metaplastic cell types within the gastric corpus of mice chronically infected with Helicobacter pylori or chronically inflamed with autoimmune gastritis and humans with autoimmune gastritis.
2024-09-25 | GSE271866 | GEO
Project description:Gastritis Gastric Juice Shotgun Digest
2010-09-02 | PRD000212 | Pride
Project description:Aberrant DNA methylation is implicated in the epigenetic field defect seen in gastric cancer (GC). Our aim in this study was to identify predictive biomarkers by screening for DNA methylation in noncancerous background gastric mucosa from GC patients. A total of 46 endoscopically obtained human gastric mucosa, 10 gastric cancer and 5 cell lines were analyzed using MCA microarray. Aberrant DNA methylation was compared with clinicopathological features. Healthy individuals were divided into two groups based on the types of chronic gastritis; A: antrum-predominant gastritis P or C: pangastritis or corpus-predominant gastritis
2012-09-01 | E-GEOD-39175 | biostudies-arrayexpress
Project description:Helicobacter pylori infection can induce gastric pathologies ranging from chronic gastritis to peptic ulcers and gastric cancer. Individuals´ response to H. pylori infection is complex and it depends on a combination of environmental factors, genetic background, host response and strain virulence. The pathway towards gastric cancer is a sequence of events known as the Correa's model of gastric carcinogenesis, a stepwise inflammatory process from normal mucosa to chronic active gastritis, atrophy, metaplasia and finally gastric adenocarcinoma. This study explores gastric clinical specimens representing different steps of the Correa pathway with the aim of identifying the expression profile of coding- and non-coding RNAs (microRNAs and small RNAs) which may have a role in the Correa's model of gastric carcinogenesis and potentially develop novel clinical biomarkers. We screened for differentially expressed genes in gastric biopsies (antrum/corpus) by employing RNAseq (for microRNAs and non-coding RNAs) and microarrays (for coding RNAs).
2020-09-01 | E-MTAB-8889 | biostudies-arrayexpress
Project description:Helicobacter pylori infection can induce gastric pathologies ranging from chronic gastritis to peptic ulcers and gastric cancer. Individuals´ response to H. pylori infection is complex and it depends on a combination of environmental factors, genetic background, host response and strain virulence. The pathway towards gastric cancer is a sequence of events known as the Correa's model of gastric carcinogenesis, a stepwise inflammatory process from normal mucosa to chronic active gastritis, atrophy, metaplasia and finally gastric adenocarcinoma. This study explores gastric clinical specimens representing different steps of the Correa pathway with the aim of identifying the expression profile of coding- and non-coding RNAs (microRNAs and small RNAs) which may have a role in the Correa's model of gastric carcinogenesis and potentially develop novel clinical biomarkers. We screened for differentially expressed genes in gastric biopsies (antrum/corpus) by employing RNAseq (for microRNAs and non-coding RNAs) and microarrays (for coding RNAs).
2020-09-01 | E-MTAB-8890 | biostudies-arrayexpress
Project description:Gastric cancer is an important health problem because it is difficult to diagnose and treat in advanced stage. This makes that the prognosis of gastric cancer patients remains scarce. Currently it is known that the cause of gastric cancer is attributed to chronic infection with Helicobacter pylori. Its persistent infection leads to development of chronic atrophic gastritis that is considered as a predecessor stage of intestinal-type gastric cancer. The understanding of the alteration of molecular mechanisms during the early stages of the development of gastric cancer, and the identification of their potential biomarkers can allow a rapid diagnosis that leads to an improvement diagnosis and increase the patient’s prognosis. We analyzed gene expression profiles of patients with chronic atrophic gastritis and gastric cancer through microarray analysis, functional enrichment analysis and validation of gene expression by quantitative PCR. Gene expression profiles in patients with chronic atrophic gastritis showed molecular changes of the gastric mucosa, which leads to intestinal metaplasia and subsequently, gastric cancer. In gastric cancer the gene expression profile showed the stage of tumor progression, the product of these genes are potential biomarkers of early stages of cancer that can be potential therapeutic targets. Accordingly, the transcriptome analysis revealed several gene groups are related to development of chronic atrophic gastritis, some of which were inhibited in gastric cancer patients. The increased expression of CLDN1, CLDN7, OLFM4, c-Myc and MMP-9 genes in chronic atrophic gastritis and gastric cancer point outs to their use as promising biomarkers for the early diagnosis of gastric cancer.
2019-12-18 | GSE116312 | GEO