Knowra Gluconeogenesis Gluconeogenesis Gluconeogenesis is the metabolic pathway that synthesizes glucose from noncarbohydrate precursors, including lactate, glycerol, and glucogenic amino acids. It helps maintain blood glucose when dietary carbohydrate is unavailable.
Pyruvate carboxylase : A mitochondrial enzyme that converts pyruvate and bicarbonate into oxaloacetate using ATP. It catalyzes the first bypass step from pyruvate toward glucose.
Lactate : A metabolite formed from pyruvate by lactate dehydrogenase, especially when glycolytic NADH production exceeds oxidation. Lactate supplies carbon that the liver can convert back into glucose.
Fasting : A period without food intake during which the body shifts fuel use and mobilizes stored nutrients. As liver glycogen declines, gluconeogenesis helps sustain blood glucose.
Hypoglycemia : A condition in which blood glucose falls below the level needed for normal physiological function. Impaired glucose production can contribute to dangerously low blood glucose during fasting.
Glycogenolysis : The breakdown of glycogen into glucose-1-phosphate and, in some tissues, free glucose. It raises blood glucose from stored carbohydrate rather than building glucose from noncarbohydrate precursors.
Phosphoenolpyruvate carboxykinase : An enzyme that converts oxaloacetate to phosphoenolpyruvate using GTP and releasing carbon dioxide. It carries carbon from oxaloacetate into the pathway toward glucose.
Glycerol : A three-carbon alcohol released during the breakdown of triglycerides. The liver converts glycerol into a glycolytic intermediate that can enter glucose synthesis.
Liver : A large organ that carries out metabolism, detoxification, bile production, and synthesis of circulating proteins. It is the principal site of gluconeogenesis and exports the glucose it produces.
Type 2 diabetes : A chronic metabolic disease characterized by elevated blood glucose and impaired insulin action and secretion. Excess hepatic glucose production, including gluconeogenesis, contributes to hyperglycemia.
Glycogenesis : The synthesis of glycogen from glucose, primarily for energy storage in liver and muscle. It stores glucose, the reverse physiological priority of glucose production during fasting.
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