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Hepatic ketogenesis and muscle carnitine deficiency
Neurology
|June 1, 1979
Summary
Fasting individuals show inverse levels of free carnitine and ketone bodies. Muscle carnitine deficiency in a lipid myopathy patient led to exaggerated ketogenesis, suggesting a link between carnitine and energy metabolism.
Area of Science:
- Biochemistry
- Metabolic Disorders
- Muscle Physiology
Background:
- Plasma free carnitine and ketone bodies inversely correlate in fasting individuals without muscle disease.
- Short-chain acyl-carnitines levels parallel beta-hydroxybutyrate during fasting.
Purpose of the Study:
- To investigate the relationship between carnitine levels and ketogenesis in a patient with lipid storage myopathy.
- To explore the potential role of muscle carnitine deficiency in altered energy metabolism.
Main Methods:
- Analysis of plasma free carnitine and ketone body levels.
- Measurement of total and free carnitine content in liver tissue.
- Clinical assessment of a patient with lipid storage myopathy and his daughters.
Main Results:
- The patient and his daughters exhibited exaggerated ketogenesis during fasting.
- Liver total carnitine was normal, but free carnitine was reduced by 50% in the patient.
- Total esterified carnitines were fourfold higher in the patient compared to controls.
Conclusions:
- Decreased muscle carnitine may lead to chronic hepatic ketogenesis, depleting muscle carnitine.
- Alternatively, reduced muscle carnitine could be the primary cause of enhanced hepatic ketogenesis.
- This study highlights the critical role of carnitine in managing energy metabolism and preventing ketogenesis.