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PP cells play an important role when it comes to the regulation of plasma glucose as they help to synthesize and release pancreatic polypeptide (PP). As PP cells secrete more pancreatic polypeptide, it has been shown to have a negative effect on insulin secretion giving it anorexic effects on intestinal functionality.
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.
[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.
Proinsulin is the prohormone precursor to insulin made in the beta cells of the Pancreatic Islets, specialized regions of the pancreas. In humans, proinsulin is encoded by the INS gene . [ 1 ] [ 2 ] The pancreatic islets only secrete between 1% and 3% of proinsulin intact. [ 3 ]
Paul Langerhans (25 July 1847 – 20 July 1888) was a German pathologist, physiologist and biologist, credited with the discovery of the cells that secrete insulin, named after him as the islets of Langerhans.
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]
Beta cells are sensitive to blood sugar levels so that they secrete insulin into the blood in response to high level of glucose, and inhibit secretion of insulin when glucose levels are low. [10] Insulin production is also regulated by glucose: high glucose promotes insulin production while low glucose levels lead to lower production. [ 11 ]
The alpha and beta cells are the endocrine cells in the pancreatic islets that release insulin and glucagon and smaller amounts of other hormones into the blood. Insulin and glucagon influence blood sugar levels. Glucagon is released when the blood glucose level is low and stimulates the liver to release glucose into the blood. Insulin ...