Back to Search
Start Over
Su1993 Somatic Mutations in the Mismatch Repair System Are Responsible for a Majority of Unexplained Lynch Syndrome Cases: Time to Revise Lynch Syndrome Screening?
- Source :
- Gastroenterology. 148:S-570
- Publication Year :
- 2015
- Publisher :
- Elsevier BV, 2015.
-
Abstract
- G A A b st ra ct s gastric tissue samples harvested from an independent population ofH. pylori-infected persons in New Orleans to assess expression and methylation status of HIF-1α in vivo. Gastric tissue specimens from African-American subjects harboring an increased risk for gastric cancer exhibited marked decreases in methylation of HIF-1α with increasing disease severity. The highest levels of HIF-1α methylation were found in patients with non-atrophic gastritis and this decreased as disease progressed to atrophic gastritis (0.5-fold) and intestinal metaplasia (0.2-fold), versus gastritis alone. Consistent with decreasing HIF-1α methylation status, gastric tissue from African-American patients harbored increased levels of HIF-1α expression with increasing disease progression and this was not observed in Caucasian patients. Collectively, these data indicate that H. pylori induces HIF-1α in gastric epithelial cells and this is augmented under conditions of iron deficiency. HIF-1α expression in vivo increases in conjunction with decreased HIF-1α methylation and the development of premalignant lesions, which may provide a mechanism underpinning the link between high altitude, iron depletion, and increased gastric cancer rates within the context of H. pylori infection.
- Subjects :
- Genetics
medicine.medical_specialty
education.field_of_study
Hepatology
Atrophic gastritis
business.industry
Population
Gastroenterology
Cancer
Intestinal metaplasia
Context (language use)
Methylation
medicine.disease
Lynch syndrome
Internal medicine
medicine
Gastritis
medicine.symptom
education
business
Subjects
Details
- ISSN :
- 00165085
- Volume :
- 148
- Database :
- OpenAIRE
- Journal :
- Gastroenterology
- Accession number :
- edsair.doi...........4ec4b591920fcb2d05aee80fd176c721