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Amino acid metabolism in pediatric patients
1Department of Pediatric Surgery, Osaka Medical Center and Research Institute for Maternal and Child Health, Japan.
Insights
Infant amino acid requirements are higher than adults due to developmental differences. Specialized formulas aim to normalize plasma amino acids, but their nutritional benefits for growth require further study.
Area of Science:
- Pediatric Nutrition
- Biochemistry
- Metabolic Disorders
Background:
- Infants have significantly higher protein and amino acid requirements compared to adults.
- Pediatric amino acid metabolism differs from adults, with unique needs and potential deficiencies.
- Enzymatic immaturities in neonates can lead to conditions like hyperphenylalaninemia and hypermethioninemia.
Purpose of the Study:
- To outline the distinct amino acid metabolism in pediatric patients.
- To discuss the role of essential and semiessential amino acids in infant nutrition.
- To evaluate current amino acid formulas and their potential applications.
Main Methods:
- Review of existing literature on pediatric amino acid metabolism.
- Analysis of the biochemical pathways involved in amino acid synthesis and degradation in infants.
- Comparison of amino acid requirements between neonates, infants, and adults.
Main Results:
- Neonates have a greater requirement for essential amino acids than adults.
- Low activity of phenylalanine hydroxylase and cystathionase can cause hyperphenylalaninemia and hypermethioninemia.
- Tyrosine and cysteine are often deficient in neonates, alongside histidine, lysine, arginine, and taurine being considered semiessential.
Conclusions:
- Current amino acid formulas are designed to normalize plasma aminograms in pediatric patients.
- The proven nutritional benefits of these formulas for growth and development are still under investigation.
- Modified formulas may hold promise for pharmacological applications in specific pediatric diseases.
Abstract:
As with energy requirements, protein requirements are relatively much greater in infants and decline progressively with age. Amino acid metabolism in pediatric patients is characterized by the following differences. The requirement for essential amino acids in neonates is larger than that in adults. Because of low activity of phenylalanine hydroxylase and cystathionase, hyperphenylalaninemia and hypermethioninemia tend to occur, whereas tyrosine and cysteine tend to be deficient. In addition to cysteine and tyrosine, histidine, lysine, arginine and taurine are considered as semiessential amino acids. Nowadays there are different kinds of amino acid formulas to satisfy these specific requirements, and most of these formulas are intended to normalize the plasma aminogram. However, the nutritional benefit of these formulas for growth and development is still not completely proven, and the pharmacological use for specific diseases is expected with some modification of these formulas.