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Gastritis II: Pathophysiology01:26

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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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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: Pathophysiology01:24

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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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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.
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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...
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Copper promotes TFF1-mediated Helicobacter pylori colonization.

Sandro Montefusco1, Roberta Esposito, Luca D'Andrea

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Trefoil Factor 1 (TFF1) binds copper, enhancing Helicobacter pylori adhesion to gastric cells. This copper-TFF1 complex promotes bacterial colonization and mucus layer thickening, impacting gastrointestinal health.

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Area of Science:

  • Gastroenterology
  • Molecular Biology
  • Microbiology

Background:

  • Trefoil peptides (TFF1-3) are crucial for gastrointestinal epithelial regeneration.
  • TFF1 acts as a gastric tumor suppressor, with its loss linked to gastric cancer.
  • Helicobacter pylori infection is a major cause of gastritis, ulcers, and gastric cancer.

Purpose of the Study:

  • To investigate the role of the copper-TFF1 complex in H. pylori adherence to epithelial cells.
  • To explore how copper influences the interaction between TFF1 and H. pylori.
  • To determine the effect of Cu-TFF1 on mucus production and bacterial colonization.

Main Methods:

  • Utilizing gastric adenocarcinoma cells (AGS AC1) engineered for TFF1 hyper-expression.
  • Employing a H. pylori mutant deficient in TFF1 binding.
  • Analyzing mucus layer thickness and bacterial colonization after copper treatment.
  • Surface Plasmon Resonance (SPR) to assess TFF1 C-terminus binding to H. pylori lipopolysaccharide (LPS).

Main Results:

  • The copper-TFF1 complex significantly enhanced H. pylori adherence to TFF1-expressing gastric cells.
  • Copper further potentiated this interaction, while a TFF1-binding deficient H. pylori mutant showed no enhanced adherence.
  • Copper treatment led to mucus layer thickening and increased H. pylori colonization in goblet cells.
  • SPR confirmed selective binding of the TFF1 C-terminus to rough form LPS (RF-LPS) of H. pylori.

Conclusions:

  • The Cu-TFF1 cuprocomplex promotes H. pylori adherence and colonization of gastric epithelial cells.
  • Copper binding to TFF1 enhances its interaction with H. pylori RF-LPS, contributing to bacterial adhesion.
  • These findings highlight a novel mechanism by which TFF1 and copper influence H. pylori-associated gastrointestinal pathologies.