- The significantly increased amount of calcium ions in the cells' cytoplasm causes the release into the blood of previously synthesized insulin, which has been stored in intracellular secretory vesicles. This is the primary mechanism for release of insulin. Other substances known to stimulate insulin release include the amino acids arginine and leucine, parasympathetic release of acetylcholine (acting via the phospholipase C pathway), sulfonylurea, cholecystokinin (CCK, also via phospholipase C), and the gastrointestinally derived incretins, such as glucagon-like peptide-1 (GLP-1) and glucose-dependent insulinotropic peptide (GIP).
Hepatic glucose release during fasting states through glycogenolysis and gluconeogenesis is stimulated by counter-regulatory, or anti-insulin hormones. Glucagon plays a major role, with synergistic effects from catecholamines, cortisol, and growth hormone (68). By contrast, in the fed state-- in response to digestion and absorption of nutrients-- circulating insulin concentration increases in the portal vein secondary to insulin secretion from pancreatic b cells.
Schematic illustration of nutrient-regulated insulin secretion. The -cells respond to many nutrients in the blood circulation, including glucose, other monosaccharides, amino acids, and fatty acids. Glucose is evolutionarily the primary stimuli for insulin release in some animal species, because it is a principal food component and can accumulate immediately after food ingestion.
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Beta cells manufacture insulin, store it in small internal packets called vesicles, and release it rapidly when needed. The Beta cell functions as a glucose sensor, initiating glucose-stimulated insulin secretion (GSIS).
Insulin is considered the most important anabolic hormone in glucose and energy homeostasis, and a rise in blood glucose itself promotes the secretion of insulin by the pancreatic cell.
Insulin secretion is defined as the release of insulin hormone into circulation, primarily stimulated by changes in blood glucose, amino acid, and free fatty acid levels, as well as gastrointestinal hormones and parasympathetic stimulation of beta cells.
