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Immunohistochemistry for pancreatic polypeptide in a mouse pancreas, 200×. Pancreatic polypeptide (PP) is a polypeptide secreted by PP cells in the endocrine pancreas.It is a hormone and it regulates pancreatic secretion activities, and also impacts liver glycogen storage and gastrointestinal secretion.
This is noted in human PP cells, but different animals have been shown to have different sized granules compared to humans, like rodents. In cats and dogs, PP cells have large granules. [6] In rats, PP cells have few granules, similar to humans. In dogs, some PP cells are located in the walls of the antrum of the stomach. [3] Pancreatic Islets
They give rise to both the endocrine and exocrine cells. Exocrine cells constitute the acinar cells and the ductal cells. The endocrine cells constitute the beta cells which make insulin, alpha cells which secrete glucagon, delta cells which secrete somatostatin and the PP-cells which secrete pancreatic polypeptide. [3]
Illustration of a dog's pancreas. Cell-islet in the illustration refers to a pancreatic cell in the Islets of Langerhans, which contain insulin-producing beta cells and other endocrine related cells. Permanent damage to these beta cells results in Type 1, or insulin-dependent diabetes, for which exogenous insulin replacement therapy is the only ...
Enteroendocrine cells are specialized cells of the gastrointestinal tract and pancreas with endocrine function. They produce gastrointestinal hormones or peptides in response to various stimuli and release them into the bloodstream for systemic effect, diffuse them as local messengers, or transmit them to the enteric nervous system to activate nervous responses.
[2] [9] The beta cells can still secrete insulin but the body has developed a resistance and its response to insulin has declined. [4] It is believed to be due to the decline of specific receptors on the surface of the liver , adipose , and muscle cells which lose their ability to respond to insulin that circulates in the blood.
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