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Related Concept Videos

Treating Helicobacter pylori in Peptic Ulcers: Antimicrobial Therapy01:16

Treating Helicobacter pylori in Peptic Ulcers: Antimicrobial Therapy

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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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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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Pathophysiology of Peptic Ulcer Disease: Mucosal Defense Factors01:24

Pathophysiology of Peptic Ulcer Disease: Mucosal Defense Factors

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Peptic ulcer disease, commonly called PUD, represents a multifaceted condition characterized by disruptions in the lining of the gastrointestinal (GI)  tract. Central to the protection of the gastrointestinal lining is the mucosal-bicarbonate barrier. This physiological defense mechanism is a formidable shield against the corrosive effects of gastric acid and pepsin secretion in the stomach. Its role is pivotal in maintaining the structural integrity of the stomach's inner lining.
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Mucosal Barrier of the Stomach01:25

Mucosal Barrier of the Stomach

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The gastric glands contain parietal cells that secrete hydrochloric acid (HCl) for digestion. The cells secrete HCl because it is highly corrosive and essential for breaking down food. To achieve this, they secrete hydrogen and chloride ions into the lumen of the gastric glands, which combine to form HCl.
Within parietal cells, carbonic acid is first formed through the reaction of water and carbon dioxide. The dissociation of carbonic acid releases bicarbonate and hydrogen ions. The bicarbonate...
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Peptic Ulcer Disease III: Clinical Manifestations and Diagnostic Studies01:28

Peptic Ulcer Disease III: Clinical Manifestations and Diagnostic Studies

275
Peptic ulcer disease (PUD) presents with diverse symptoms depending on the location and severity of the ulcer. Clinical manifestations of peptic ulcer include dull pain and a burning sensation in the mid-epigastric region.
Few clinical manifestations differentiate gastric ulcers from duodenal ulcers. Distinctions in the location, timing, and pain relief are crucial for healthcare providers in differentiating between gastric and duodenal ulcers during clinical assessments.
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Acid Suppressive Drugs for Peptic Ulcer Disease: Proton Pump Inhibitors01:13

Acid Suppressive Drugs for Peptic Ulcer Disease: Proton Pump Inhibitors

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Peptic ulcers, often induced by H. pylori infections or NSAID usage, arise from disruptions in the delicate balance of gastric acid production. Peptic ulcers stem from heightened gastric acid levels due to H. pylori infections or NSAID use. The protective mucus layer diminishes in the presence of these factors, allowing gastric acid to erode the stomach lining and form ulcers.
Gastric acid, a potent cocktail of hydrogen and chloride ions, is produced in specialized parietal cells within the...
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Gastric Mucosa Quantitative Polymerase Chain Reaction Analysis for Detecting Helicobacter pylori and Antibiotic Resistance
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Gastric Mucosa Quantitative Polymerase Chain Reaction Analysis for Detecting Helicobacter pylori and Antibiotic Resistance

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Helicobacter pylori: a stealth assassin.

Lydia E Wroblewski1, Richard M Peek1

  • 1Division of Gastroenterology, Department of Medicine, Vanderbilt University Medical Center, Nashville, TN, USA.

Trends in Cancer
|June 13, 2021
PubMed
Summary

Helicobacter pylori infection causes gastric cancer by inducing BRCAness in epithelial cells, enabling them to evade apoptosis. Understanding this mechanism is key to identifying individuals at risk for cancer development.

Keywords:
BRCAnessCagAHelicobacter pyloriP53PAR1bgastric cancer

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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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Area of Science:

  • Oncology
  • Microbiology
  • Molecular Biology

Background:

  • Helicobacter pylori infection is the primary risk factor for gastric cancer.
  • Understanding H. pylori pathogenesis is vital for identifying individuals susceptible to gastric neoplasia.

Purpose of the Study:

  • To investigate the mechanism by which H. pylori contributes to gastric cancer development.
  • To elucidate how H. pylori infection leads to cellular changes associated with cancer.

Main Methods:

  • The study by Imai et al. focused on the molecular interactions between H. pylori and gastric epithelial cells.
  • Analysis of cellular responses, including apoptosis evasion and DNA repair pathway alterations.

Main Results:

  • H. pylori infection was shown to induce a state of 'BRCAness' in gastric epithelial cells.
  • This BRCAness phenomenon confers resistance to apoptosis, a hallmark of cancer cells.

Conclusions:

  • H. pylori infection promotes gastric carcinogenesis by inducing BRCAness and apoptosis evasion.
  • These findings offer insights into the molecular pathways linking H. pylori to gastric cancer.