Arginine-guanidinoacetate-creatine pathway in preterm newborns: creatine biosynthesis in newborns

Area of Science:

• Biochemistry
• Neonatology
• Developmental Neuroscience

Background:

• The phosphocreatine/creatine system is crucial for embryonic brain development.
• Premature birth may disrupt creatine biosynthesis, affecting brain creatine supply.
• Understanding creatine metabolism in preterm infants is vital for neurological outcomes.

Purpose of the Study:

• To investigate creatine biosynthesis pathway alterations in preterm and very preterm infants.
• To compare urinary creatine and guanidinoacetate levels between preterm and full-term newborns.
• To assess the potential impact of altered creatine metabolism on neurological development.

Main Methods:

• Urinary guanidinoacetate, creatine, and creatinine levels were measured in 53 preterm and 55 full-term infants.
• Samples were collected at specific time points post-birth (48 h, 9 days, discharge).
• Amino acid profiles were also analyzed in preterm and full-term groups.

Main Results:

• Preterm and very preterm newborns exhibited significantly higher urinary guanidinoacetate levels at discharge compared to full-term infants.
• Very preterm infants showed significantly lower urinary creatine levels than full-term infants.
• These findings indicate a potential impairment in the creatine biosynthesis pathway.

Conclusions:

• Preterm and very preterm birth may lead to an impaired creatine biosynthesis pathway.
• This impairment could result in creatine depletion, potentially affecting neurological development.
• Further research is needed to confirm the long-term neurological implications.