title: Study of the distribution by age group of serum cross-linked C-terminal telopeptide of type I collagen and procollagen type I N-propeptide in healthy Japanese women to establish reference values.
abstract: Osteoporosis prevention is an important public health goal. Bone turnover markers are clinically measured to assess bone strength. C-terminal telopeptide of type I collagen (CTX) is released when collagens degrade and serves as an indicator of bone resorption. Simple CTX immunoassays are now available. However, serum CTX (sCTX) reference ranges for Japanese women are lacking. Procollagen type I N-propeptide (intact P1NP) reflects osteoblast activity, serving as a marker of bone formation. Because sCTX and intact P1NP are clinically applied as bone turnover markers, we determined reference ranges for both sCTX and intact P1NP in healthy Japanese women. We collected 228 blood samples from healthy Japanese women aged 19-83 years, grouped by age and menopausal status. We measured sCTX and intact P1NP and examined their correlation. sCTX values differed significantly between the two consecutive decade groups encompassing 19-39 years of age, intact P1NP values between 20 and 30 s, between post-menopausal 50 and 60 s, and between pre-and post-menopausal women in their 50 s. The mean sCTX of 91 healthy pre-menopausal women was 0.255 (0.100-0.653) ng/mL, the intact P1NP in 90 women 33.2 (17.1-64.7) μg/L. Corresponding values for post-menopausal women were 0.345 (0.115-1.030) ng/mL and 41.6 (21.9-79.1) μg/L. sCTX correlated with intact P1NP. Bone resorption markers are measured to assess anti-resorption agents, bone formation markers to assess the effects of bone-forming agents. The sCTX and intact P1NP reference values determined herein, in healthy Japanese women, are expected to be useful for osteoporosis treatment, assessment of fracture risk, and other clinical applications.
authors.affiliation: Department of Obstetrics and Gynecology, Yokohama City University Hospital, 3-9 Fukuura, Kanazawa-ku, Yokohama, Kanagawa, 236-0004, Japan, yunomura@kg8.so-net.ne.jp.
authors.forename: Yoshiyuki
authors.initials: Y
authors.lastname: Nomura
authors.forename: Atsuo
authors.initials: A
authors.lastname: Yoshizaki
authors.forename: Hiromi
authors.initials: H
authors.lastname: Yoshikata
authors.forename: Ritsuko
authors.initials: R
authors.lastname: Kikuchi
authors.forename: Hideya
authors.initials: H
authors.lastname: Sakakibara
authors.forename: Osamu
authors.initials: O
authors.lastname: Chaki
authors.forename: Masao
authors.initials: M
authors.lastname: Fukunaga
authors.forename: Fumiki
authors.initials: F
authors.lastname: Hirahara
mesh_terms: D000328:Adult; D017677:Age Distribution; D000368:Aged; D000369:Aged, 80 and over; D044466:Asian People; D024042:Collagen Type I / Q000097:blood*; D005260:Female; D006801:Humans; D008875:Middle Aged; D010446:Peptide Fragments / Q000097:blood*; D010455:Peptides / Q000097:blood*; D017698:Postmenopause / Q000097:blood; D017697:Premenopause / Q000097:blood; D011347:Procollagen / Q000097:blood*; D012016:Reference Values; D016387:Women's Health; D055815:Young Adult
chemical_list: D024042:Collagen Type I; D010446:Peptide Fragments; D010455:Peptides; D011347:Procollagen; C052929:collagen type I trimeric cross-linked peptide; C047202:procollagen Type I N-terminal peptide