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Urinary pyridinoline and deoxypyridinoline excretion in children
Author(s) -
Shaw N. J.,
Dutton J.,
Fraser W. D.,
Smith C. S.
Publication year - 1995
Publication title -
clinical endocrinology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.055
H-Index - 147
eISSN - 1365-2265
pISSN - 0300-0664
DOI - 10.1111/j.1365-2265.1995.tb02687.x
Subject(s) - deoxypyridinoline , pyridinoline , endocrinology , medicine , excretion , urinary system , urine , chemistry , enzyme , biochemistry , alkaline phosphatase , osteocalcin
Summary OBJECTIVE There are few data on urinary markers of collagen breakdown In children. We have determined a normal range for urinary pyridinoline and deoxypyridinoline In children, assessed the variability in excretion in individual children and examined the effect of GH treatment on the excretion of these collagen cross‐links. DESIGN A cross‐sectional study of a group of healthy children and sequential samples from children receiving GH treatment. PATIENTS One hundred and nine healthy children aged 2–15 years, 8 healthy children aged 4–11 years and 4 children receiving GH treatment. MEASUREMENTS Total pyridinoline and deoxypyridinoline excretion were measured by high performance liquid chromatography after initial acid hydrolysis and cellulose extraction steps. Serum parathyroid hormone was measured using a two‐site immunoradiometric assay and urinary hydroxyproline by Ehrlich's reaction using a colorlmetric assay. Pyridinoline and deoxypyridinoline excretion were expressed as a ratio against urine creatinine. RESULTS High excretion of pyridinoline (Pyr) and deoxypyridinoline (DPyr) was seen at all ages with no apparent relation to age (mean Pyr/Cr 115 nmol/mmol and DPyr/Cr 31 nmol/mmol). No correlation was found with serum parathyroid hormone or urinary hydroxyproline excretion. Marked day to day variation was seen in individual children. A progressive rise in excretion was seen In children receiving GH treatment with no significant correlation to height velocity. CONCLUSIONS There is a high excretion of the pyrldi‐nium cross‐linking amino acids in children of all ages compared to adults. However, a high variability exists In single morning urine samples which will limit the usefulness of these markers in growing children.