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Related Concept Videos

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.
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In the intricate landscape of the gastric lumen, excessive acid secretion disrupts the natural defense mechanisms, weakening the mucus-bicarbonate barrier. This vulnerability allows pepsin to infiltrate epithelial cells, digesting mucosal proteins and triggering erosion, leading to ulcer formation.
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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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Related Experiment Video

Updated: Feb 20, 2026

A Protein Microarray Assay for Serological Determination of Antigen-specific Antibody Responses Following Clostridium difficile Infection
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A Protein Microarray Assay for Serological Determination of Antigen-specific Antibody Responses Following Clostridium difficile Infection

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Mucosal vaccination clears Clostridioides difficile colonization.

Audrey K Thomas1,2, F Christopher Peritore-Galve1,2, Alyssa G Ehni1,2

  • 1Department of Pathology, Microbiology & Immunology, Vanderbilt University Medical Center, Nashville, TN, USA.

Nature
|February 18, 2026
PubMed
Summary
This summary is machine-generated.

Mucosal vaccination effectively clears Clostridioides difficile infection (CDI) and prevents recurrence by inducing specific immune responses in the gut. This approach offers superior protection compared to traditional parenteral vaccination methods for CDI.

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Area of Science:

  • Microbiology
  • Immunology
  • Vaccinology

Background:

  • Clostridioides difficile infection (CDI) is a major cause of hospital-acquired infections with high recurrence rates.
  • Previous parenteral vaccines failed to prevent pathogen transmission and recurrence by not inducing mucosal immunity.

Purpose of the Study:

  • To compare the efficacy of mucosal versus parenteral administration of a novel C. difficile vaccine.
  • To identify immune correlates of protection and pathogen clearance following vaccination.

Main Methods:

  • A multivalent, adjuvanted vaccine with inactivated toxins and surface antigens was administered rectally (mucosal) or intraperitoneally (parenteral).
  • Protection, colonization burden, and immune responses (fecal IgG, colonic T cells) were assessed.

Main Results:

  • Mucosal immunization, unlike parenteral, successfully cleared C. difficile from the host.
  • Key correlates included fecal IgG to surface antigens and T helper type 17 (TH17) responses to spore antigens.
  • Mucosal vaccination significantly protected against CDI morbidity, mortality, tissue damage, and recurrence.

Conclusions:

  • Mucosal vaccination elicits sterilizing immunity against CDI, demonstrating superior efficacy over parenteral routes.
  • This study highlights the importance of mucosal immunity for preventing C. difficile transmission and recurrence.