title: Comparison of bone resorption markers during hypocalcemia in dairy cows.
abstract: This study investigated whether hydroxyproline, deoxypyridinoline, or the carboxyterminal telopeptide of type I collagen could be used as markers to provide evidence of bone resorption during hypocalcemia of dairy cows. Serum concentrations of the amino-terminal propeptide of type III procollagen were also analyzed to study the effect of parturition on type III collagen, which is a component of soft connective tissues. Urine and blood samples were collected on d 1 to 5, on d 9, and d 14 after parturition from 18 cows with symptoms of periparturient paresis (group 1) and 19 healthy control cows without symptoms (group 2). Urine concentrations of hydroxyproline and deoxypyridinoline were measured with a colorimetric assay and an enzyme immunoassay, respectively. Serum concentrations of the amino-terminal propeptide of type III procollagen were measured using a commercially available radioimmunoassay. A radioimmunoassay was developed to analyze serum concentrations of the carboxyterminal telopeptide of bovine type I collagen. The mean corrected urinary hydroxyproline concentrations in group 1 increased from parturition to d 14; concentrations in group 1 were significantly higher for group 2 after d 5. Mean corrected deoxypyridinoline concentrations in urine increased after parturition to reach a peak at d 9, and serum concentrations of the carboxyterminal telopeptide of type I collagen peaked at d 5. However, mean concentrations of deoxypyridinoline and the carboxyterminal telopeptide of type I collagen did not differ significantly between groups. The variation in the behavior of the three markers is likely a reflection of the different phases and aspects of the bone collagen degradation. In conclusion, assays for urinary deoxypyridinoline and serum carboxyterminal telopeptide of type I collagen determinations are useful tools to follow the course of degradation of bone collagen in dairy cows.
authors.affiliation: Institute of Animal Nutrition, University of Zurich, Switzerland.
authors.forename: A
authors.initials: A
authors.lastname: Liesegang
authors.forename: M L
authors.initials: ML
authors.lastname: Sassi
authors.forename: J
authors.initials: J
authors.lastname: Risteli
authors.forename: R
authors.initials: R
authors.lastname: Eicher
authors.forename: M
authors.initials: M
authors.lastname: Wanner
authors.forename: J L
authors.initials: JL
authors.lastname: Riond
mesh_terms: D000596:Amino Acids / Q000652:urine; D000818:Animals; D015415:Biomarkers / Q000032:analysis*; D001862:Bone Resorption / Q000378:metabolism / Q000662:veterinary*; D002417:Cattle; D002418:Cattle Diseases / Q000378:metabolism*; D003094:Collagen / Q000652:urine; D024042:Collagen Type I; D005260:Female; D006801:Humans; D006909:Hydroxyproline / Q000652:urine; D006996:Hypocalcemia / Q000097:blood / Q000652:urine / Q000662:veterinary*; D010446:Peptide Fragments / Q000097:blood; D010455:Peptides / Q000652:urine; D011347:Procollagen / Q000097:blood; D012016:Reference Values
chemical_list: D000596:Amino Acids; D015415:Biomarkers; D024042:Collagen Type I; D010446:Peptide Fragments; D010455:Peptides; D011347:Procollagen; C052929:collagen type I trimeric cross-linked peptide; C041876:procollagen Type III-N-terminal peptide; C036020:deoxypyridinoline; D003094:Collagen; D006909:Hydroxyproline