Experimental esophagitis in a rabbit model. Clinical relevance

Area of Science:

• Gastroenterology
• Esophageal Physiology
• Reflux Disease Research

Background:

• Gastroesophageal reflux, involving excess acid and/or alkaline substances, is linked to esophagitis.
• Understanding the specific agents causing esophageal injury is crucial for effective treatment.

Purpose of the Study:

• To investigate the role of endogenous injurious agents in causing esophageal mucosal damage.
• To develop and utilize a rabbit esophageal model for studying reflux esophagitis.

Main Methods:

• A continuously perfused in vivo rabbit esophageal model was employed.
• The effects of hydrochloric acid (HCl), bile salts, pepsin, and trypsin on esophageal mucosa were assessed.

Main Results:

• Physiologic HCl did not breach the mucosal barrier or cause esophagitis.
• Bile salts disrupted the mucosal barrier but did not induce clinically consistent esophagitis.
• Pepsin (acidic) and trypsin (alkaline) induced severe hemorrhagic erosive esophagitis, mirroring clinical findings.
• Sucralfate demonstrated mucosal protective effects against acid-pepsin injury.

Conclusions:

• Proteolytic enzymes are the primary agents responsible for severe reflux esophagitis.
• Therapeutic strategies should target proteolytic enzymes, not solely acid or bile salts.
• Sucralfate shows promise as a protective agent against specific reflux-induced esophageal injuries.