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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
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.
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]
[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.
APUD cells (DNES cells) constitute a group of apparently unrelated endocrine cells, which were named by the scientist A.G.E. Pearse, who developed the APUD concept in the 1960s based on calcitonin-secreting parafollicular C cells of dog thyroid. [1] These cells share the common function of secreting a low molecular weight polypeptide hormone ...
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.
When insulin binds to the insulin receptor, it leads to a cascade of cellular processes that promote the usage or, in some cases, the storage of glucose in the cell. The effects of insulin vary depending on the tissue involved, e.g., insulin is most important in the uptake of glucose by muscle and adipose tissue. [2]
Insulin resistance in Type 2 diabetes produces a greater demand for insulin production which results in the secretion of proinsulin. [29] ProIAPP is secreted simultaneously, however, the enzymes that convert these precursor molecules into insulin and IAPP, respectively, are not able to keep up with the high levels of secretion, ultimately ...