Gastrins in human antrum, duodenum and peripheral circulation.

Area of Science:

• Gastroenterology
• Endocrinology
• Peptide Hormone Research

Background:

• Conflicting evidence exists regarding gastrin release from the human pyloric antrum and duodenum.
• Arginine-stimulated gastrin release is reportedly absent after pyloric antrectomy in humans.

Purpose of the Study:

• To reconcile conflicting findings on gastrin release from the human stomach and duodenum.
• To investigate the different forms of gastrin present in the pyloric antrum and duodenum.
• To analyze gastrin forms in fasting versus stimulated serum samples.

Main Methods:

• Analysis of gastrin forms in human pyloric antrum and duodenal tissue.
• Measurement of gastrin forms in fasting and arginine-stimulated serum samples.

Main Results:

• The pyloric antrum predominantly contains heptadecapeptide gastrin.
• The duodenum primarily contains "big" gastrin, with minimal heptadecapeptide gastrin.
• Fasting serum shows higher levels of "big" gastrins, while stimulated serum has increased heptadecapeptide and minigastrin.

Conclusions:

• Gastrin composition varies significantly between the pyloric antrum and duodenum.
• Local factors at G-cell sites likely influence the type of gastrin released.
• "Big" gastrins are prevalent in most gastrin-containing tissues, suggesting a common precursor or regulatory mechanism.