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Oxaloacetate deficiency in MCT-induced ketogenesis
Archives Internationales De Physiologie Et De Biochimie
|December 1, 1978
Summary
Medium-chain triglycerides (MCT) accelerate ketogenesis partly due to hepatic oxaloacetate deficiency. Supplying oxaloacetate reduced ketone bodies, confirming this link in rats.
Area of Science:
- Biochemistry
- Metabolic pathways
Background:
- Ketogenesis is the production of ketone bodies.
- Medium-chain triglycerides (MCT) are fatty acids (C8-C12) known to accelerate ketogenesis.
- Hepatic oxaloacetate plays a crucial role in metabolic regulation.
Purpose of the Study:
- To investigate if a deficiency in hepatic oxaloacetate explains the accelerated ketogenesis observed after MCT ingestion.
- To determine the role of oxaloacetate levels in MCT-induced ketogenesis.
Main Methods:
- Rats were administered MCT.
- Oxaloacetate was supplied indirectly via intraperitoneal injection of oxaloacetate, aspartate, or L-tryptophan.
- Ketone body levels in the liver were measured.
Main Results:
- Indirectly supplied oxaloacetate led to a significant decrease in liver ketone body levels.
- The stimulation of ketogenesis by MCT was partially attributed to oxaloacetate deficiency.
- Oxaloacetate deficiency resulted from its leakage into gluconeogenesis and reduction to malate.
Conclusions:
- Hepatic oxaloacetate deficiency is a contributing factor to MCT-accelerated ketogenesis.
- MCT-derived acetyl-CoA, unable to enter the Krebs cycle, is diverted to ketone body production.
- Metabolic flux regulation involving oxaloacetate is critical in managing ketogenesis.