Molecular forms of gastrin in canine duodenum after antrectomy

Area of Science:

• Gastroenterology
• Endocrinology
• Surgical Research

Background:

• Antrectomy, the surgical removal of the gastric antrum, alters gastrointestinal hormone profiles.
• Previous studies indicated an increase in duodenal gastrin following antrectomy.

Purpose of the Study:

• To investigate the specific gastrin components present in duodenal extracts after antrectomy in dogs.
• To compare gastrin profiles between dogs with different gastrointestinal reconstructions and unoperated controls.

Main Methods:

• Gel chromatography and radioimmunoassay using specific gastrin antisera were employed.
• Duodenal extracts from antrectomized dogs (gastroduodenostomy or gastrojejunostomy) and control dogs were analyzed.

Main Results:

• Gastrin-17 was the predominant gastrin form in antrectomized dogs, with gastrin-34 being significantly less abundant.
• A distinct peak, similar to the cholecystokinin octapeptide, was significantly lower in antrectomized dogs compared to controls.
• Cholecystokinin-33 was identified in duodenal extracts of all dogs.

Conclusions:

• The observed increase in duodenal gastrin post-antrectomy is primarily attributed to elevated levels of gastrin-17.
• Surgical reconstruction method (gastroduodenostomy vs. gastrojejunostomy) did not significantly alter the gastrin component pattern.