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The syndrome of systemic carnitine deficiency. Clinical, morphologic, biochemical, and pathophysiologic features
Insights
This study highlights a child with carnitine deficiency, impacting liver and muscle function, leading to weakness. Carnitine replacement therapy improved symptoms, underscoring its importance in fatty acid metabolism.
Area of Science:
- Biochemistry
- Pediatrics
- Metabolic Disorders
Background:
- Carnitine deficiency can lead to significant health issues, affecting energy metabolism.
- Muscle and liver dysfunction are key indicators of impaired fatty acid oxidation.
- Understanding carnitine's role is crucial for diagnosing and treating metabolic myopathies.
Purpose of the Study:
- To investigate the underlying cause of recurrent hepatic and cerebral dysfunction in a pediatric patient.
- To analyze the effects of carnitine deficiency on fatty acid metabolism and muscle function.
- To evaluate the efficacy of oral carnitine replacement therapy.
Main Methods:
- Clinical assessment of an 11-year-old boy with progressive weakness.
- Biochemical analysis of muscle, plasma, and liver for carnitine levels and lipid content.
- In vivo studies using perfused forearm muscles to assess fatty acid and glucose metabolism.
- Histopathological examination of liver and muscle tissues.
Main Results:
- The patient presented with lipid excess in muscle, hepatic abnormalities, and marked carnitine deficiency across tissues.
- Impaired ketogenesis and enhanced omega-oxidation were observed, alongside reduced long-chain fatty acid oxidation in muscles.
- Oral carnitine therapy normalized plasma levels and led to clinical improvement, though tissue levels remained suboptimal.
Conclusions:
- Carnitine deficiency is a significant cause of metabolic dysfunction in children, affecting multiple organ systems.
- Fatty acid oxidation pathways are critically dependent on adequate carnitine levels.
- While oral carnitine therapy offers clinical benefits, achieving optimal tissue carnitine concentrations may require further investigation.
Abstract:
An 11-year old boy had had recurrent episodes of hepatic and cerebral dysfunction and underdeveloped musculature. Overt weakness developed at age 10. Lipid excess, especially in type I fibers, was found in muscle. Hypertrophied smooth endoplasmic reticulum and excessive microbodies were present in liver. Marked carnitine deficiency was shown in skeletal muscle, plasma, and liver. Ketogenesis was impaired on a high fat diet, but omega oxidation of fatty acids was enhanced. There was excessive glucose uptake and essentially no oxidation of labeled long-chain fatty acids by perfused forearm muscles in vivo. Oral replacement therapy restored plasma carnitine levels to normal, but not liver or muscle carnitine levels, and was accompanied by clinical improvement.