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JOURNAL ARTICLE
REVIEW
The role of carnitine in the perinatal period.
Developmental Period Medicine 2014 October
Carnitine (2-hydroxy-4-trimethylammonium butyrate, vitamin BT) is a small hydrophilic molecule derived from protein-bound lysine, not degraded in the body but excreted via urine, bile and breast milk. Carnitine stimulates the catabolism of long-chain fatty acids (FAs), by transporting them to mitochondria for oxidation, and the intracellular decomposition of branched-chain ketoacids. It also helps to excrete toxic exogenous and nontoxic endogenous organic acids via urine. It further participates in the production of pulmonary surfactant, inhibits free radicals production and demonstrates other antioxidant properties. After delivery, infants dramatically increase energy demands for movement, growth, differentiation and maintenance of the body temperature that strongly depend on FAs oxidation which is facilitated by carnitine. At early stages of life, carnitine biosynthesis is less efficient than in adults and immature infants have less carnitine tissue reserves than term infants. Carnitine supplementation is recommended in newborns with aciduria, childhood epilepsy associated with valproate-induced hepatotoxicity, in kidney-associated syndromes, and premature infants receiving total parenteral nutrition. Concentrations of carnitine and acylcarnitines in neonatal blood have been postulated a useful tool for the diagnosis of type 1 diabetes, as well as the detection and monitoring of many inherited and acquired metabolic disorders. Taking into account the complex metabolic role of cellular FAs transporters, further studies are needed on indications and contraindications for carnitine supplementation in different clinical settings during early developmental period.
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