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A Strategy for Sensitive, Large Scale Quantitative Metabolomics
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3-Hydroxyproline content of normal urine.

E Adams, S Ramaswamy, M Lamon

    The Journal of Clinical Investigation
    |June 1, 1978
    PubMed
    Summary
    This summary is machine-generated.

    This study quantifies urinary 3-hydroxyproline and 4-hydroxyproline in healthy adults. 3-Hydroxyproline, a newly measured amino acid, shows distinct excretion patterns suggesting independent metabolic pathways.

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    Area of Science:

    • Biochemistry
    • Human Physiology
    • Metabolomics

    Background:

    • Hydroxyproline isomers are key components of collagen.
    • Understanding their urinary excretion provides insights into collagen metabolism and turnover.
    • 3-Hydroxyproline has not been previously quantified in human urine.

    Purpose of the Study:

    • To quantify urinary 3-hydroxyproline and 4-hydroxyproline in healthy humans.
    • To investigate the relationship between the excretion of these two hydroxyproline forms.
    • To explore potential differences in their catabolic pathways and excretion mechanisms.

    Main Methods:

    • Collected 24-hour urine specimens from 18 healthy human subjects across six decades.
    • Utilized an isotope-dilution method with extensive purification for 3-hydroxyproline measurement.
    • Employed an amino acid analyzer for precise quantification of both hydroxyproline isomers.

    Main Results:

    • 3-Hydroxyproline averaged 3% of 4-hydroxyproline levels in individual urine samples.
    • Excretion of both 3-hydroxyproline and 4-hydroxyproline increased in the second decade of life.
    • A hydroxyprolinemic subject showed elevated 4-hydroxyproline but not excessive 3-hydroxyproline, indicating independent catabolism.
    • 3-Hydroxyproline appears selectively excreted relative to 4-hydroxyproline.

    Conclusions:

    • 3-Hydroxyproline and 4-hydroxyproline are excreted via independent catabolic pathways.
    • Differential excretion suggests variations in collagen turnover or peptide cleavage resistance.
    • This study establishes baseline urinary levels for 3-hydroxyproline, aiding future research in collagen-related disorders.