Gluconeogenic enzyme network

The gluconeogenic enzyme network is a coordinated system of enzymes that catalyze the de novo synthesis of glucose from non-carbohydrate substrates such as lactate, glycerol, and glucogenic amino acids (StatPearls, 2023). This metabolic pathway primarily occurs in the liver and to a lesser extent in the kidney cortex, playing a vital role in maintaining euglycemia during periods of fasting or intense exercise (NIH, 2022). The network's flux is controlled by four key regulatory enzymes: pyruvate carboxylase, phosphoenolpyruvate carboxykinase (PEPCK), fructose-1,6-bisphosphatase (FBPase), and glucose-6-phosphatase (G6Pase) (Lehninger Principles of Biochemistry, 2017). In type 2 diabetes, dysregulation of this network leads to inappropriately high rates of hepatic glucose production, which is a major contributor to fasting hyperglycemia (PubMed, 19049575). Therapeutic strategies targeting this network include direct inhibition of FBPase or PEPCK, as well as indirect suppression via hormonal signaling or activation of the energy-sensing kinase AMPK (Nature Reviews Endocrinology, 2014). However, therapeutic development is complicated by the risk of hypoglycemia and potential side effects like lactic acidosis or hepatic steatosis resulting from the accumulation of upstream metabolites (PubMed, 21142006).

Other names

Gluconeogenesis pathwayEndogenous glucose production pathwayHepatic gluconeogenic enzymes

Suppression of hepatic glucose production by inhibiting rate-limiting enzymes or their transcriptional expression.