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Related Concept Videos

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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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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Peptic Ulcer Disease I: Introduction01:30

Peptic Ulcer Disease I: Introduction

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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...
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Peptic Ulcer Disease III: Clinical Manifestations and Diagnostic Studies01:28

Peptic Ulcer Disease III: Clinical Manifestations and Diagnostic Studies

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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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Peptic Ulcer Disease II: Pathophysiology01:28

Peptic Ulcer Disease II: Pathophysiology

168
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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Intestinal Phase of Digestion01:29

Intestinal Phase of Digestion

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The intestinal phase of digestion is the third and final stage of the digestive process, occurring after the cephalic and gastric phases. It begins when chyme, a partially digested mixture of food and digestive enzymes, enters the small intestine from the stomach. This phase is crucial for nutrient absorption and involves complex hormonal and enzymatic interactions.
The arrival of the chyme in the small intestine distends the duodenum, which triggers the enterogastric reflex. This distension...
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The Duodenal Microenvironment in Functional Dyspepsia.

Pauline Huyghe1, Matthias Ceulemans1, Åsa V Keita2

  • 1Translational Research Centre for Gastrointestinal Disorders (TARGID), Department of Chronic Diseases and Metabolism (CHROMETA), Katholieke Universiteit Leuven, Leuven, Belgium.

Journal of Neurogastroenterology and Motility
|April 10, 2025
PubMed
Summary

Functional dyspepsia (FD) involves upper abdominal symptoms due to an impaired duodenal barrier and immune activation. These findings challenge the "functional" label and suggest new treatment targets for this common gastrointestinal disorder.

Keywords:
DuodenumDyspepsiaEosinophilsIntestinal mucosaMast cells

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Area of Science:

  • Gastroenterology
  • Immunology
  • Microbiology

Background:

  • Functional dyspepsia (FD) is a prevalent chronic gastrointestinal disorder with elusive pathophysiology.
  • Recent research indicates duodenal microenvironment alterations in FD patients.
  • Understanding these changes is crucial for developing effective treatments.

Purpose of the Study:

  • To review the duodenal microenvironment in homeostasis and FD.
  • To highlight consistent findings and discrepancies across studies.
  • To explore potential triggers for duodenal alterations in FD.

Main Methods:

  • Literature review focusing on duodenal microenvironment in FD.
  • Analysis of molecular and cellular changes in the duodenal mucosa.
  • Synthesis of evidence regarding barrier function and immune activation.

Main Results:

  • Consistent findings include an impaired duodenal barrier and duodenal immune activation in FD.
  • Specific immune cells like eosinophils and mast cells show mucosal activation.
  • Potential triggers identified include psychological factors, luminal changes, and food.

Conclusions:

  • Evidence suggests molecular and cellular changes in the duodenal microenvironment of FD patients.
  • An impaired duodenal barrier and immune activation challenge the purely functional classification of FD.
  • These findings offer novel therapeutic targets for FD treatment.