Novel roles of gastrin

Area of Science:

• Gastroenterology
• Endocrinology
• Molecular Biology

Background:

• Gastrin's role in gastric acid secretion via the CCK2 receptor is well-established.
• This review explores additional functions of gastrin and its gene products.

Purpose of the Study:

• To review the multifaceted roles of gastrin beyond acid secretion.
• To discuss the biological activities of gastrin gene products, including progastrin and intermediates.
• To examine gastrin's potential role in the incretin effect and colonic epithelial proliferation.

Main Methods:

• Literature review of recent studies on gastrin and its gene products.
• Analysis of signaling pathways involved in gastrin's actions.
• Discussion of current debates regarding gastrin receptor interactions.

Main Results:

• Gastrin regulates genes involved in extracellular matrix remodeling, crucial for gastric epithelial integrity.
• Gastrin may contribute to the post-prandial incretin effect.
• Progastrin and glycine-extended intermediates exhibit proliferative effects on colonic and esophageal cells, with potential implications for cancer.

Conclusions:

• Gastrin possesses diverse physiological roles, including extracellular matrix regulation and potential incretin activity.
• Other gastrin gene products, like progastrin, have significant proliferative effects on the gut epithelium.
• Further research is needed to elucidate the precise mechanisms and receptors involved in these diverse gastrin functions.