title: Increased serum concentrations of type I procollagen C-terminal propeptide and osteocalcin during a short course of calcitriol administration to adult male volunteers.
abstract: To investigate bone collagen metabolism during vitamin D treatment, 15 healthy males (aged 28-45 years, median 34) were treated orally with calcitriol, 2 micrograms daily for 7 days and followed for a total of 2 weeks. The serum concentration of calcitriol rose markedly (median difference and 95% confidence limits: 49% (5-82), p less than 0.005) during treatment, whereas serum levels of calcidiol, and calcium remained unchanged. The serum level of procollagen type I C-terminal propeptide rose 15% (7-33, p less than 0.003), whereas no alterations were observed concerning serum procollagen type III N-terminal propeptide, and serum hyaluronan. The serum concentration of osteocalcin rose concomitantly (26% (12-45), p less than 0.003). All values returned to baseline levels within seven days after the treatment week. The serum levels of osteocalcin and procollagen type I C-terminal propeptide were positively correlated (rs = 0.71, p less than 0.004) during the study. Serum procollagen type I C-terminal propeptide and serum osteocalcin did not correlate with serum procollagen type III N-terminal propeptide or serum hyaluronan either at baseline or after treatment. It is concluded that a short course of calcitriol administration to healthy males stimulates the biosynthesis of bone-related matrix proteins. By contrast, connective tissue components of predominantly extraosseous origin are not affected.
authors.affiliation: Department of Medical Endocrinology, Odense University Hospital, Denmark.
authors.forename: J
authors.initials: J
authors.lastname: Gram
authors.forename: J
authors.initials: J
authors.lastname: Bollerslev
authors.forename: H K
authors.initials: HK
authors.lastname: Nielsen
authors.forename: P
authors.initials: P
authors.lastname: Junker
mesh_terms: D000284:Administration, Oral; D000328:Adult; D015415:Biomarkers / Q000097:blood; D001842:Bone and Bones / Q000378:metabolism; D002117:Calcitriol / Q000008:administration & dosage / Q000494:pharmacology*; D003238:Connective Tissue / Q000378:metabolism; D004305:Dose-Response Relationship, Drug; D005109:Extracellular Matrix / Q000378:metabolism; D006801:Humans; D006820:Hyaluronic Acid / Q000097:blood; D008297:Male; D008875:Middle Aged; D010006:Osteoblasts / Q000378:metabolism; D015675:Osteocalcin / Q000097:blood*; D010446:Peptide Fragments / Q000097:blood*; D011347:Procollagen / Q000097:blood*; D013997:Time Factors
chemical_list: D015415:Biomarkers; D010446:Peptide Fragments; D011347:Procollagen; C041876:procollagen Type III-N-terminal peptide; C042813:procollagen type I carboxy terminal peptide; D015675:Osteocalcin; D006820:Hyaluronic Acid; D002117:Calcitriol