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Related Concept Videos

Gastritis II: Pathophysiology01:26

Gastritis II: Pathophysiology

The pathophysiology of gastritis begins with the colonization of the stomach lining by Helicobacter pylori (H. pylori). This bacterium spreads mainly via the oral-oral route through saliva or shared utensils, and can also be transmitted in overcrowded or unhygienic environments through contaminated water, despite its brief survival outside the body.ColonizationOnce ingested, H. pylori enters the stomach and begins colonization by navigating through the mucus layer lining the stomach wall. It...
Peptic Ulcer01:27

Peptic Ulcer

Peptic ulcers are erosive lesions of the gastric or duodenal lining, most commonly caused by Helicobacter pylori infection. This Gram-negative, helical bacterium has adapted to survive the stomach’s acidic environment by producing urease, which converts urea into ammonia and carbon dioxide. The ammonia neutralizes gastric acid in the bacterium’s immediate environment, allowing colonization of the gastric mucosa. H. pylori attaches to mucus-secreting epithelial cells, penetrates the mucus...
Treating Helicobacter pylori in Peptic Ulcers: Antimicrobial Therapy01:16

Treating Helicobacter pylori in Peptic Ulcers: Antimicrobial Therapy

Helicobacter pylori, a resilient gram-negative bacterium, can thrive in the stomach's harsh, acidic environment. Infection with H. pylori leads to a cascade of events within the stomach lining. One of the critical disruptions caused by this bacterium is the interference with somatostatin production, a hormone responsible for regulating acid secretion. This interference tips the balance, escalating acid secretion and diminishing bicarbonate levels. This imbalance compromises the defensive...
Peptic Ulcer Disease I: Introduction01:30

Peptic Ulcer Disease I: Introduction

Peptic Ulcer Disease (PUD) is characterized by mucosal excavation in the esophagus, stomach, pylorus, or duodenum. It can manifest as acute or chronic based on the extent and duration of mucosal involvement.
An acute ulcer, marked by superficial erosion and minimal inflammation, swiftly resolves upon identifying and addressing the underlying cause. In contrast, a chronic ulcer persists, potentially eroding through the muscular wall and forming fibrous tissue.
Peptic ulcers can also be...
Peptic Ulcer Disease I: Introduction01:25

Peptic Ulcer Disease I: Introduction

Peptic ulcer disease (PUD) involves breaks in the gastrointestinal tract's mucosal lining, primarily in the stomach and duodenum, with less frequent occurrences in the lower esophagus or near the pylorus.Ulcers can be acute or chronic. Acute ulcers are short-lived with minimal inflammation and heal quickly after the irritant is removed. Chronic ulcers persist, may recur, and often cause scarring due to ongoing tissue damage. Superficial erosions affect only the mucosal layer and are called...
Peptic Ulcer Disease III: Clinical Manifestations and Complications01:25

Peptic Ulcer Disease III: Clinical Manifestations and Complications

Duodenal UlcersDuodenal ulcers are the most common form of peptic ulcer disease, presenting with chronic, intermittent epigastric pain. Pain typically appears 2–3 hours after meals, especially when the stomach is empty, often waking patients at night. It is characteristically relieved by food or antacids (“pain–food–relief”). Some patients remain asymptomatic until complications like bleeding or perforation emerge, particularly with NSAID or anticoagulant use.Gastric UlcersGastric ulcers share...

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Related Experiment Video

Updated: Jul 12, 2026

Mouse Models Of Helicobacter Infection And Gastric Pathologies
07:43

Mouse Models Of Helicobacter Infection And Gastric Pathologies

Published on: October 18, 2018

Helicobacter and gastric malignancies.

Steven F Moss1, Peter Malfertheiner

  • 1Rhode Island Hospital and Brown University, Providence, RI 02903, USA. Steven_Moss@brown.edu

Helicobacter
|October 11, 2007
PubMed
Summary

Helicobacter pylori is a major risk factor for gastric cancer and MALT lymphoma. While eradication helps, its impact on global cancer rates is moderate, and research continues into its carcinogenic mechanisms and host responses.

Area of Science:

  • Gastroenterology
  • Oncology
  • Microbiology

Background:

  • Helicobacter pylori is the primary risk factor for gastric adenocarcinoma and MALT lymphoma.
  • Eradication therapy is most effective before intestinal metaplasia develops.
  • H. pylori eradication alone has a moderate impact on global gastric cancer incidence.

Purpose of the Study:

  • To explore the mechanisms of H. pylori-associated gastric carcinogenesis.
  • To investigate host responses and genetic factors influencing H. pylori infection outcomes.
  • To understand H. pylori's role in lymphomagenesis.

Main Methods:

  • Review of clinical trial data on H. pylori eradication efficacy.
  • Analysis of evidence on bacterial invasion and host cell signaling pathways.

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Establishment and Evaluation of a Risk Prediction Model for Pathological Escalation of Gastric Low-Grade Intraepithelial Neoplasia
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Establishment and Evaluation of a Risk Prediction Model for Pathological Escalation of Gastric Low-Grade Intraepithelial Neoplasia

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Mouse Models Of Helicobacter Infection And Gastric Pathologies
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Published on: October 18, 2018

Profiling Luminal pH in Three-Dimensional Gastrointestinal Organoids Using Microelectrodes
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Profiling Luminal pH in Three-Dimensional Gastrointestinal Organoids Using Microelectrodes

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Establishment and Evaluation of a Risk Prediction Model for Pathological Escalation of Gastric Low-Grade Intraepithelial Neoplasia
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  • Examination of host genetic polymorphisms (NOD2, COX-2, TLR-4) and their role in infection.
  • Investigation of H. pylori's role in MALT lymphoma development.
  • Consideration of Helicobacter hepaticus links to other cancers.

    • Main Results:

    • H. pylori can invade gastric epithelium; its products affect cell signaling.
    • Host immune response genes (NOD2, COX-2, TLR-4) are key determinants.
    • H. pylori eradication is indicated for MALT lymphoma, sometimes even in H. pylori-negative cases.
    • Specific chromosomal translocations and host genetics may influence infection outcomes.
    • Helicobacter hepaticus is linked to intestinal and breast tumorigenesis in mice.

    Conclusions:

    • H. pylori's role in gastric cancer involves complex interactions with host cells and genetics.
    • Understanding these mechanisms is crucial for effective prevention and treatment strategies.
    • Further research is needed, including on Helicobacter hepaticus's oncogenic potential.