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Related Concept Videos

Pathophysiology of Peptic Ulcer Disease: Injurious Factors01:22

Pathophysiology of Peptic Ulcer Disease: Injurious Factors

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Peptic ulcers are sores on the stomach's inner lining and the upper small intestine, which are the result of disruptions in the mucosal layer that houses parietal cells which produce gastric acid, and chief cells which secrete pepsinogen.
In the antrum region, G cells secrete the gastrin hormone that binds to gastrin-cholecystokinin-B (CCK2) receptors on parietal and enterochromaffin-like (ECL) cells in the fundic glands. Simultaneously, the vagus nerve releases acetylcholine, which binds...
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Treating Helicobacter pylori in Peptic Ulcers: Antimicrobial Therapy01:16

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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...
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Peptic Ulcer Disease II: Pathophysiology01:28

Peptic Ulcer Disease II: Pathophysiology

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Peptic Ulcer Disease (PUD) is characterized by the development of ulcers in the stomach or duodenal mucosa. Its pathophysiology is complex, involving a balance between damaging and protective elements.
Damaging agents such as Helicobacter pylori, gastric acid, pepsin, and nonsteroidal anti-inflammatory drugs (NSAIDs) can weaken the mucosal defense, allowing hydrogen ions to infiltrate back and harm epithelial cells.
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Peptidoglycan Synthesis01:28

Peptidoglycan Synthesis

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Structure of PeptidoglycanPeptidoglycan is a vital structural component of the bacterial cell wall, providing mechanical strength and shape to the cell. It consists of repeating units of two sugars—N-acetylglucosamine (NAG) and N-acetylmuramic acid (NAM)—linked by β-1,4 glycosidic bonds. These sugar chains are cross-linked by short peptide chains, forming a mesh-like polymer that surrounds the bacterial plasma membrane.Cytoplasmic Phase – Precursor SynthesisPeptidoglycan...
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Gastritis II: Pathophysiology01:26

Gastritis II: Pathophysiology

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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...
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Peptic Ulcer Disease II: Pathophysiology01:24

Peptic Ulcer Disease II: Pathophysiology

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Peptic ulcer disease develops when protective mechanisms of the gastrointestinal mucosa are overwhelmed by harmful factors, leading to localized erosions in the stomach or proximal duodenum. The main causes are Helicobacter pylori infection and chronic use of nonsteroidal anti-inflammatory drugs (NSAIDs).Helicobacter pylori–Induced InjuryBacterial Adaptation and Colonization:H. pylori is a spiral, Gram-negative bacterium adapted to the acidic stomach. and transmitted through oral-oral or...
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Related Experiment Video

Updated: May 6, 2026

High Resolution Electron Microscopy of the Helicobacter pylori Cag Type IV Secretion System Pili Produced in Varying Conditions of Iron Availability
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Paf-acether synthesis by Helicobacter pylori.

Y Denizot1, I Sobhani, J C Rambaud

  • 1INSERM U200, Clamart, France.

Gut
|November 1, 1990
PubMed
Summary

Helicobacter pylori produces platelet-activating factor (paf), a substance linked to gastroduodenal ulcers. This finding suggests H. pylori may contribute to ulcer development in the stomach lining.

Area of Science:

  • Microbiology
  • Gastroenterology
  • Biochemistry

Background:

  • Clinical studies implicate Helicobacter pylori in gastroduodenal ulcer pathogenesis.
  • Platelet-activating factor (paf) is known to cause gastrointestinal disorders, including ulceration.

Purpose of the Study:

  • To investigate the potential synthesis of paf by H. pylori.
  • To determine if H. pylori contributes to local paf production in the gastric mucosa.

Main Methods:

  • H. pylori isolates from patients with gastritis and duodenal ulcers were cultured.
  • Paf production was assessed using platelet aggregation assays after ethanolic extraction and HPLC purification.
  • Bacteria were cultured on blood agar and brucella broth medium, with and without paf precursors.

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Gastric Mucosa Quantitative Polymerase Chain Reaction Analysis for Detecting Helicobacter pylori and Antibiotic Resistance
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High Resolution Electron Microscopy of the Helicobacter pylori Cag Type IV Secretion System Pili Produced in Varying Conditions of Iron Availability
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One-step Negative Chromatographic Purification of Helicobacter pylori Neutrophil-activating Protein Overexpressed in Escherichia coli in Batch Mode
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Gastric Mucosa Quantitative Polymerase Chain Reaction Analysis for Detecting Helicobacter pylori and Antibiotic Resistance
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Main Results:

  • Paf was detected in H. pylori cultured on blood agar, but not on brucella broth medium.
  • Supplementation with paf precursors (lyso paf and acetyl-CoA) induced paf production in some isolates.
  • Extracted platelet aggregating material showed characteristics identical to eukaryotic paf.

Conclusions:

  • H. pylori can synthesize paf under specific conditions.
  • H. pylori may contribute to the local production of paf in inflamed gastric mucosa, potentially playing a role in ulcer pathogenesis.