Insulin Secretion Pathway (Pancreatic Beta Cell)

The pancreatic beta cell’s insulin secretion pathway integrates metabolic sensing with electrical activity and exocytic machinery—primarily through a cascade initiated by increased intracellular ATP following glycolysis—which ultimately results in tightly controlled pulsatile release of insulin into circulation for systemic glycemic regulation. It involves glucose uptake via GLUT transporters, glycolysis leading to increased ATP/ADP ratio, KATP channel closure causing membrane depolarization, calcium influx through VDCCs, and exocytosis of insulin granules. This pathway is crucial for maintaining blood glucose homeostasis and is dysregulated in diabetes.

Other names

Beta cell insulin release pathwayInsulin secretion cascadeGlucose-stimulated insulin secretion (GSIS)

Varies depending on the specific target within the pathway. Sulfonylureas close KATP channels. GLP-1 receptor agonists increase cAMP and activate PKA and Epac2 pathways.