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Ketogenic response to fasting in human carnitine deficiencies
Clinica Chimica Acta; International Journal of Clinical Chemistry
|January 31, 1980
Summary
Carnitine deficiency impacts ketone production differently based on liver involvement. Adequate liver carnitine is essential for efficient ketone body synthesis during fasting.
Area of Science:
- Biochemistry
- Metabolic disorders
- Clinical nutrition
Background:
- Carnitine is vital for fatty acid metabolism.
- Carnitine deficiency can lead to myopathy.
- Ketone body production is crucial during fasting.
Purpose of the Study:
- To investigate the role of carnitine in ketogenic response during fasting.
- To compare ketogenic responses in patients with varying carnitine deficiency patterns.
- To assess the importance of liver carnitine for ketogenesis.
Main Methods:
- Quantification of carnitine and its esters in muscle and liver tissues.
- Monitoring of plasma carnitines and ketone bodies during a 38-hour fast.
- Comparative analysis of metabolic responses between two patients.
Main Results:
- One patient with skeletal muscle carnitine deficiency showed increased ketone production during fasting.
- A second patient with both skeletal muscle and liver carnitine deficiency exhibited poor ketone production.
- Plasma carnitine levels correlated with ketogenic response.
Conclusions:
- Liver carnitine levels are critical for activating hepatic ketogenesis.
- Skeletal muscle carnitine deficiency alone does not impair fasting ketogenesis.
- Carnitine's role in energy metabolism is tissue-specific and crucial for fasting adaptation.