gluconeogenesis
Pronunciation: gloo-ko-nee-oh-JEN-eh-sis
The metabolic process by which the liver and other organs synthesize glucose from non-carbohydrate precursors, contributing to fasting hyperglycemia in diabetes.
Full Definition
Gluconeogenesis is the biochemical pathway through which glucose is synthesized from non-carbohydrate substrates including amino acids, lactate, glycerol, and other organic compounds. This process primarily occurs in the liver during fasting states and is essential for maintaining blood glucose levels when dietary carbohydrate is unavailable. In diabetes, particularly type 2, hepatic gluconeogenesis becomes dysregulated and contributes significantly to fasting hyperglycemia and overall glycemic control. The process is normally suppressed by insulin and enhanced by glucagon, cortisol, and growth hormone. Understanding gluconeogenesis is crucial for diabetes management, as several antidiabetic medications, including metformin, work partly by inhibiting hepatic glucose production through this pathway.
Usage
Usage note: Distinguish from glycogenolysis (glucose from stored glycogen) and glucogenesis (general glucose formation).
In Context
- "Excessive hepatic gluconeogenesis contributes to elevated fasting glucose levels in patients with type 2 diabetes." — Metabolism research paper
- "Metformin improves glycemic control primarily by reducing gluconeogenesis in the liver." — Pharmacology textbook