Morphological alterations in experimental esophagitis. Light microscopic and scanning and transmission electron...

Area of Science:

• Gastroenterology
• Cell Biology
• Pathology

Background:

• Esophagitis is a common condition with various causes.
• Understanding the specific mechanisms of esophageal mucosal damage is crucial for effective treatment.

Purpose of the Study:

• To investigate the morphological changes in esophagitis induced by different agents.
• To differentiate the damage patterns caused by acid, pepsin, and bile salts.

Main Methods:

• Rabbit esophagus was isolated and perfused with hydrochloric acid (HCl), pepsin, taurocholate, and deoxycholate.
• Light and electron microscopy were used to assess tissue morphology.
• Plasma membrane permeability was evaluated using trypan blue and antinuclear antibodies.

Main Results:

• HCl alone caused minimal esophageal epithelial changes.
• Pepsin or taurocholate combined with HCl induced severe ulcerative esophagitis.
• Deoxycholate caused significant damage under nonacidic conditions.
• Pepsin-induced esophagitis primarily affected intercellular substances, leading to cell shedding.
• Bile salt-induced esophagitis (taurocholate and deoxycholate) primarily damaged cell membranes and organelles.
• The presence or absence of acid did not alter the morphological similarity of bile salt-induced lesions.

Conclusions:

• Pepsin and bile salts cause distinct morphological patterns of esophagitis.
• Bile salts induce severe esophageal damage independent of acid conditions.
• Understanding these specific mechanisms can inform therapeutic strategies for esophagitis.