Gland
Pancreatic beta cell
The endocrine cell that releases insulin with C-peptide
High-yield
Cleavage of proinsulin yields insulin and C-peptide in equal molar amounts. Their measured blood concentrations differ because clearance and metabolism are different.
Overview
Beta cells normally provide the body's circulating insulin and form a large share of the human islet population. Glucose metabolism raises ATP, alters potassium-channel activity and promotes calcium entry, triggering granule release. Other nutrients, hormones and neural signals modify this response.
Reference facts
- Location
- Intermixed with other endocrine cells in human islets; relative abundance and local core-like groupings vary among islets.
- Hormones
- Insulin and C-peptide are released after proinsulin processing; amylin is also secreted from beta-cell granules.
- Blood supply
- Closely associated with islet capillaries in an integrated network, rather than always receiving blood before every other cell type.
- Innervation
- Vagal and incretin signals can enhance release; sympathetic alpha-2 signaling inhibits it, with effects depending on receptor and physiological context.
- Function
- Promotes glucose use and nutrient storage and restrains hepatic glucose production, fat breakdown and ketone formation.
Clinical correlation
During hypoglycemia, insulin and C-peptide patterns help distinguish endogenous secretion from injected insulin, interpreted with drug exposure, assay behavior and renal function. Sulfonylureas can stimulate endogenous insulin and C-peptide release.
Frequently asked questions
Where is the pancreatic beta cell located?
Intermixed with other endocrine cells in human islets; relative abundance and local core-like groupings vary among islets.
What does the pancreatic beta cell secrete?
Insulin and C-peptide are released after proinsulin processing; amylin is also secreted from beta-cell granules.
What does the pancreatic beta cell do?
Promotes glucose use and nutrient storage and restrains hepatic glucose production, fat breakdown and ketone formation.
What is the blood supply of the pancreatic beta cell?
Closely associated with islet capillaries in an integrated network, rather than always receiving blood before every other cell type.