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Related Experiment Videos

Improved methods for isolating cortisol metabolites from neonatal urine.

H J Derks, N M Drayer

    Clinical Chemistry
    |July 1, 1978
    PubMed
    Summary

    Newborns excrete unique cortisol metabolites, including an unidentified conjugate absent in adults. This conjugate can only be hydrolyzed through solvolysis, highlighting significant metabolic differences.

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    Area of Science:

    • Endocrinology
    • Metabolomics
    • Pediatric Research

    Background:

    • Cortisol metabolism and excretion pathways are crucial for understanding adrenal function.
    • Neonatal steroid metabolism differs significantly from adults, impacting drug efficacy and toxicity.
    • Identifying unique metabolites in newborns is essential for pediatric health and development.

    Purpose of the Study:

    • To investigate and characterize cortisol metabolites in newborns compared to children and adults.
    • To identify and analyze unique steroid conjugates present in neonatal urine.
    • To determine the hydrolytic properties of unknown neonatal cortisol conjugates.

    Main Methods:

    • Urine samples collected from newborns, children, and adults after administering a [3H] cortisol tracer dose.
    • Ion-exchange chromatography employed for separating free and conjugated cortisol metabolites.
    • Modified Amberlite XAD-2 procedure utilized for quantitative extraction of polar metabolites from neonatal urine.

    Main Results:

    • Significant differences observed in ion-exchange chromatographic patterns between neonates and adults.
    • A quantitatively important, unidentified cortisol conjugate was found in neonatal urine, absent in adults.
    • The unknown neonatal conjugate was found to be hydrolyzable exclusively by solvolysis.

    Conclusions:

    • Neonatal cortisol metabolism features unique conjugates not found in adults.
    • The unidentified neonatal conjugate represents a significant metabolic pathway specific to newborns.
    • Solvolysis is the sole effective method for hydrolyzing this unique neonatal steroid conjugate.

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