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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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Pathophysiology of Peptic Ulcer Disease: Mucosal Defense Factors01:24

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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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Acid Suppressive Drugs for Peptic Ulcer Disease: Proton Pump Inhibitors01:13

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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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Acid Suppressive Drugs for Peptic Ulcer Disease: Histamine H2-Receptor Antagonists01:28

Acid Suppressive Drugs for Peptic Ulcer Disease: Histamine H2-Receptor Antagonists

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Histamine H2 receptors, which are intricately located on the basolateral membrane of parietal cells, play a crucial role in modulating gastric acid secretion. When released from enterochromaffin-like cells, histamine engages H2 receptors, initiating the cyclic AMP (cAMP) pathway. In this pathway, adenylyl cyclase converts ATP into cAMP, elevating intracellular cAMP levels. The activation of protein kinase A follows, stimulating the proton pump. This stimulation prompts the secretion of hydrogen...
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Acid Suppressive Drugs for Peptic Ulcer Disease: Antacids01:31

Acid Suppressive Drugs for Peptic Ulcer Disease: Antacids

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In the complex environment of the gastric lumen, excessive acid secretion can lead to the formation or worsening of ulcers within the delicate mucosal layer. Antacids, such as sodium bicarbonate and calcium carbonate, provide relief by neutralizing this acid, transforming it into harmless salt and water. This neutralization process raises the gastric pH from a highly acidic level of 1 to a more basic 3-4, reducing the acidity within the stomach.
However, this neutralization reaction between...
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Drugs for Peptic Ulcer Disease: Prostaglandin Analogs as Mucosal Protective Agents01:20

Drugs for Peptic Ulcer Disease: Prostaglandin Analogs as Mucosal Protective Agents

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The gastric mucosa produces prostaglandins E2 (PGE2) and prostacyclin (PGI2), crucial in maintaining gastric health. They exert cytoprotective effects, including increasing bicarbonate secretion, releasing protective mucin, reducing gastric acid output, and preventing harmful vasoconstriction. These effects are mediated through various receptors, such as EP1, EP2, EP3, and EP4.
Non-steroidal anti-inflammatory drugs (NSAIDs) can induce peptic ulcers by inhibiting cyclooxygenase, decreasing...
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Ex Vivo Intestinal Sacs to Assess Mucosal Permeability in Models of Gastrointestinal Disease
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Decrease in alkaline secretion during duodenal ulceration induced by mepirizole in rats.

K Tabata, E D Jacobson, M H Chen

    Gastroenterology
    |August 1, 1984
    PubMed
    Summary
    This summary is machine-generated.

    Mepirizole, an anti-inflammatory drug, causes duodenal ulcers by reducing duodenal alkaline secretion. This effect is dose-dependent and can be reversed by prostaglandins, suggesting a new therapeutic approach for mepirizole-induced ulcers.

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    Area of Science:

    • Gastroenterology
    • Pharmacology

    Background:

    • Mepirizole is a potent anti-inflammatory agent.
    • Its mechanism of causing duodenal ulceration is not fully understood.

    Purpose of the Study:

    • To investigate the mechanisms by which mepirizole causes duodenal ulceration in rats.
    • To determine the effect of mepirizole on duodenal alkaline secretion and related gastrointestinal hormones.

    Main Methods:

    • Rats were administered mepirizole subcutaneously and orally.
    • Basal gastric acid secretion and duodenal alkaline output were measured.
    • Plasma and duodenal mucosal levels of gastrointestinal hormones were analyzed.
    • The effects of secretin and prostaglandin E2 were evaluated.

    Main Results:

    • Mepirizole significantly reduced duodenal alkaline output in a dose-dependent manner.
    • This reduction was maximal at 3 hours and persisted for 6 hours.
    • Plasma hormone levels remained unchanged, but duodenal secretin levels decreased while vasoactive intestinal peptide increased.
    • Exogenous prostaglandin E2 reversed the effect of mepirizole on duodenal alkaline secretion.

    Conclusions:

    • Mepirizole-induced duodenal ulceration is primarily mediated by a reduction in duodenal alkaline secretion.
    • This effect is linked to altered levels of secretin and vasoactive intestinal peptide in the duodenal mucosa.
    • Prostaglandin administration can counteract the ulcerogenic effects of mepirizole.