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Journal Article
Review
Anatomical basis of gastrin- and CCK-secreting cells and their functions. A review.
Biomedical Research 2023
Gastrin and CCK (cholecystokinin), gut hormones first secreted after postprandial stages, share the C-terminal amino acids and some types of receptors to be stimulated. Both types of hormone-secreting cells are typical open-type cells which detect foods and their digested elements in the lumen and regulate the secretion of gastric acid and digestive enzymes, gut motility, and satiety. Gastrin cell granules are characterized by their heterogenous ultrastructure within the cell, while CCK cell granules show a uniform ultrastructural figure. Gastrin cells are equipped with peptone receptor GPR92, amino acid receptor GPRC6A, and a Ca-sensing receptor. In addition to nutrient receptors, the release of CCK is regulated by a unique negative feedback mechanism. Development of an antibody for CCK-specific receptor (CCK-1R) has revealed its exact localization throughout the body, but specific antibodies against CCK-2R remain unavailable. Gastrin affects differentiation and proliferation-including cancer cells, while CCK possesses trophic effects to target tissues. CCK is a peripheral satiety signal and acts either via the vagus or directly on the dorsal medulla via CCK-1R. In this review, endocrine cells secreting these unique and so-called old gut hormones are described on a morphological basis.
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