Interaction between pepsin and acid secretion during fundic perfusion in cat and rabbit

Area of Science:

• Gastroenterology
• Physiology

Background:

• The Heidenhain pouch is a surgically isolated segment of the stomach used to study gastric secretion.
• Understanding the regulation of gastric acid and pepsin secretion is crucial for diagnosing and treating digestive disorders.

Purpose of the Study:

• To investigate the effect of perfusing a Heidenhain pouch at a low pH (5.5) on gastric acid and pepsin secretion in cats and rabbits.
• To determine if this perfusion alters basal or meal-stimulated gastric secretion.

Main Methods:

• Heidenhain pouches were surgically created in cats and rabbits.
• Pouch secretions (acid and pepsin) were collected and measured under basal conditions and after a meal.
• The effect of perfusing the pouch with a solution at pH 5.5 was compared to control conditions.

Main Results:

• Perfusion at pH 5.5 significantly increased pepsin secretion in both species under basal conditions.
• Acid secretion remained unchanged by the pH 5.5 perfusion in basal conditions.
• Neither acid nor pepsin secretion was significantly altered by the perfusion after a meal in either species.
• Gastric acid and pepsin secretion were found to be independent during meal-induced phases in rabbits, unlike in cats.

Conclusions:

• Perfusion of a Heidenhain pouch at pH 5.5 selectively stimulates pepsin secretion under basal conditions.
• The study highlights species-specific differences in the regulation of gastric acid and pepsin secretion, particularly concerning their independence during meal stimulation.