gastrinas

Gastrin is a peptide hormone produced by G cells in the stomach. It plays a crucial role in stimulating gastric acid secretion. When food enters the stomach, it triggers the release of gastrin, which then binds to receptors on parietal cells in the stomach lining. This binding promotes the production and release of hydrochloric acid, a key component of gastric juice. Hydrochloric acid aids in the digestion of food and helps to kill ingested microorganisms. Gastrin also has trophic effects on the gastric mucosa, meaning it can promote the growth and maintenance of the stomach lining. Its secretion is regulated by various factors, including the presence of amino acids and peptides in the stomach, as well as the pH of the stomach contents. High acidity generally inhibits gastrin release, while low acidity stimulates it. Disruptions in gastrin production or signaling can lead to various gastrointestinal disorders, including peptic ulcers and Zollinger-Ellison syndrome, a condition characterized by excessive gastrin production and severe acid hypersecretion.