Project description:Gene expression was studied in samples from the stomach of Rhesus monkeys that have been infected with Helicobacter pylori and treated with a known carcinogen (Ethyl-nitro-nitrosoguanidine (ENNG)) that is similar to known nitrosamine dietary carcinogens. The samples represent the following: Biopsy 4689 is from animal 81G taken 55 months after inoculation with H. pylori and the start of the carcinogen ENNG Biopsy 4691 is from animal 63G taken 55 months after inoculation with H. pylori and the start of the carcinogen ENNG Biopsy 4709 is from animal 92F taken after 55 months of observation and no treatment (control). Gastric biopsies were obtained at the indicated times and RNA was harvested from the sample. All hybridizations were conducted against a common reference that was prepared using commercially obtained RNA isolated from the stomach of uninfected monkeys.
Project description:Gene expression was studied in samples from the stomach of Rhesus monkeys that have been infected with Helicobacter pylori and treated with a known carcinogen (Ethyl-nitro-nitrosoguanidine (ENNG)) that is similar to known nitrosamine dietary carcinogens. The samples represent the following: Biopsy 4689 is from animal 81G taken 55 months after inoculation with H. pylori and the start of the carcinogen ENNG Biopsy 4691 is from animal 63G taken 55 months after inoculation with H. pylori and the start of the carcinogen ENNG Biopsy 4709 is from animal 92F taken after 55 months of observation and no treatment (control). Gastric biopsies were obtained at the indicated times and RNA was harvested from the sample. All hybridizations were conducted against a common reference that was prepared using commercially obtained RNA isolated from the stomach of uninfected monkeys. Infection: Inoculated with H. pylori and treated with carcinogen ENNG (Treated) or control
Project description:Helicobacter pylori are gram-negative bacteria that colonize the human stomach and are the major etiological factor in gastric carcinoma development. The aim of this work was to evaluate changes in gene expression in gastric cells induced by H. pylori.
Project description:We have employed whole microRNA microarray with the potential to distinguish H.pylori infection.Among the 470 human miRNAs represented on the array chip, 228 were undetectable or expressed below the background and so were eliminated, leaving 242 miRNAs for the supervised analysis. When comparing 10 H. pylori-negative and nine H. pylori-positive subjects, 55 miRNAs were deemed significantly different on the basis of microRNA arrays. During endoscopy, a biopsy specimen was obtained from the gastric antrum along the lesser curvature. Biopsies of 10 H. pylori-negative and nine H. pylori-positive patients' subjects were performed.Exclusion criteria were: age <18 or >80 y, pregnancy, body mass index (BMI) >30 kg/m2, diabetes mellitus, cachectic state (including cancer), systemic infection, liver disease, renal impairment, use of medications effective against H. pylori during the preceding 3 months, alcohol abuse, drug addiction, and chronic corticosteroid or nonsteroidal anti-inflammatory drug use. None of the subjects had undergone gastrointestinal surgery.
Project description:The study was undertaken to identify microRNAs differently expressed by intestinal type of gastric cancer using miRNA microarray. The miRNA expression in the intestinal type of gastric cancer depending on H. pylori infection suggest that different gastric cancer pathogenesis could be exist between H. pylori-positive and -negative gastric cancer.
Project description:Helicobacter pylori are gram-negative bacteria that colonize the human stomach and are the major etiological factor in gastric carcinoma development. The aim of this work was to evaluate changes in gene expression in gastric cells induced by H. pylori. The human gastric carcinoma-derived cell line AGS was infected with H. pylori strain 60190 (ATCC 49503) for 24 hours. RNA was extracted from three independent experiments.
Project description:Transcription profiling by array of human CD4 positive and CD8 positive T cells selected by positive or negative immunomagnetic cell selection
Project description:The study was undertaken to identify microRNAs differently expressed by intestinal type of gastric cancer using miRNA microarray. The miRNA expression in the intestinal type of gastric cancer depending on H. pylori infection suggest that different gastric cancer pathogenesis could be exist between H. pylori-positive and -negative gastric cancer. Total RNA was extracted from cancerous region and non-cancerous regions in formalin fixed paraffin embedded tissues of intestinal type gastric cancer patients who were H. pylori-positive (n=8) or -negative (n=8). Corresponding author: Nayoung Kim, M.D., Department of Internal Medicine, Seoul National University Bundang Hospital (Tel., +82-31-787-7008; e-mail, nayoungkim49@empas.com).