Neonatal nutritional carnitine deficiency: a piglet model

Area of Science:

• Biochemistry
• Nutritional Science
• Animal Models

Background:

• The clinical significance of nutritional carnitine deficiency is debated.
• A controlled animal model is needed to investigate carnitine deficiency.
• Neonatal piglets are susceptible to nutritional deficiencies.

Purpose of the Study:

• To develop and validate a newborn piglet model for studying nutritional carnitine deficiency.
• To assess the effects of carnitine deprivation on carnitine levels and physiological functions in piglets.

Main Methods:

• Forty-five newborn piglets received total parenteral nutrition for 2-3 weeks, with or without L-carnitine supplementation.
• Carnitine levels were measured in blood, urine, liver, heart, and skeletal muscle.
• Oxidation studies, electron microscopy, and carnitine balance studies were performed.

Main Results:

• Carnitine-deprived piglets exhibited negative carnitine balance and significantly lower carnitine levels across various tissues.
• Lipid deposition in liver and skeletal muscle, muscle weakness, and cardiac dysfunction were observed in deprived piglets.
• Impaired fatty acid oxidation rates in liver homogenates from carnitine-deprived piglets were restored by L-carnitine in vitro.

Conclusions:

• Neonatal carnitine deprivation in piglets results in biochemical and functional deficits consistent with carnitine deficiency.
• The parenteral nutrition-induced carnitine-deficient piglet model is suitable for studying neonatal nutritional carnitine deficiency.
• This model can elucidate the role of carnitine in neonatal metabolism and organ function.