16/05/2026
Glucose Homeostasis Overview👇
This diagram illustrates the cellular mechanisms that maintain glucose homeostasis, a tightly regulated balance between blood glucose levels and metabolic processes. The pancreas plays a central role by releasing insulin or glucagon in response to changes in blood glucose.
✅Insulin and Hyperglycemia
When blood glucose levels are high (hyperglycemia), insulin is released. Insulin promotes glycolysis (glucose breakdown), glycogenesis (glycogen storage), and lipogenesis (fat synthesis). At the same time, it inhibits lipolysis and protein breakdown, helping store energy and reduce blood glucose levels.
✅Glucagon and Hypoglycemia
In contrast, during low blood glucose levels (hypoglycemia), glucagon is released. This hormone stimulates glycogenolysis (breakdown of glycogen) and gluconeogenesis (glucose production), primarily in the liver, to increase blood glucose levels.
✅Metabolic Pathway Interplay
The balance between opposing pathways—glycolysis vs gluconeogenesis, glycogenesis vs glycogenolysis, and lipogenesis vs lipolysis—is essential. These processes occur mainly in the liver, muscle, and adipose tissue, ensuring a continuous energy supply.
✅Regulation by Stimulation and Inhibition
The symbols (+) and (−) in the diagram indicate stimulation and inhibition. Insulin generally activates storage and anabolic pathways, while glucagon activates mobilization and catabolic pathways, creating a dynamic regulatory system.
✅Physiological Importance
Maintaining glucose homeostasis is critical for normal cellular function, especially for energy-demanding organs like the brain. Disruption of this balance can lead to metabolic disorders such as diabetes.
💡Mahgoub, M.O.; Ali, I.I.; Adeghate, J.O.; Tekes, K.; Kalász, H.; Adeghate, E.A. An Update on the Molecular and Cellular Basis of Pharmacotherapy in Type 2 Diabetes Mellitus. Int. J. Mol. Sci. 2023, 24, 9328. https://doi.org/10.3390/ijms24119328
