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Procollagen type I N‐terminal peptide in preterm infants is associated with growth during the first six months post‐term
Author(s) -
Lagemaat Monique,
Veer Eveline,
Weissenbruch Mirjam M.,
Lafeber Harrie N.,
Rotteveel Joost
Publication year - 2014
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/cen.12454
Subject(s) - small for gestational age , medicine , gestational age , birth weight , gastroenterology , endocrinology , procollagen peptidase , creatinine , weight gain , alkaline phosphatase , low birth weight , pediatrics , pregnancy , biochemistry , body weight , chemistry , biology , genetics , enzyme
Summary Objective To identify growth‐related collagen and bone parameters in small‐for‐gestational‐age ( SGA ) and appropriate‐for‐gestational‐age ( AGA ) preterm infants during the first six months post‐term. In SGA preterm infants, increased growth and decreased bone acquisition, which we demonstrated previously, may be reflected by these markers. Design Observational study within a randomized controlled trial. Patients Thirty‐three SGA (weight, length or both at birth <‐2 SDS ) and 98 AGA preterm infants (gestational age [median ( IQR )]: 31·1 (1·6) vs 30·3 (2·0) weeks; 72·7% vs 42·9% boys). Measurements Weight (g), length (cm), procollagen type I N‐terminal peptide ( PINP ; μg/l), urinary helical peptide ( UHP ; μg/mmol creatinine) and alkaline phosphatase ( ALP ; U/l) expressed as standard deviation scores ( SDS ) at term age, three and six months post‐term. Results Weight and length gain during the first six months post‐term and PINP SDS at term age, three months and six months post‐term were higher in SGA compared with AGA infants. UHP SDS and ALP SDS were similar in SGA and AGA infants. PINP SDS and UHP SDS at term age and PINP SDS at three months were associated with subsequent weight and length gain until six months post‐term. Conclusions Increased growth in SGA compared with AGA preterm infants is reflected by increased collagen type I synthesis during the first six months post‐term, suggesting that PINP and UHP correspond with growth in preterm infants. An explanation for decreased bone acquisition of SGA preterm infants may be that increased collagen type I synthesis is not directly followed by increased bone mineralization.