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Journal of Dental Research
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Biological

Association between Craniofacial Growth and Urinary Bone Metabolic Markers (Pyridinoline, Deoxypyridinoline) in Growing Rats

K. Tanimoto, M. Imada, S. Ohno, A. Sasaki, K. Honda and K. Tanne*

Department of Orthodontics and Craniofacial Developmental Biology, Hiroshima University Graduate School of Biomedical Sciences, 1–2–3 Kasumi, Minami-ku, Hiroshima 734-8553, Japan;

Correspondence: *corresponding author, tanne{at}hiroshima-u.ac.jp

Pyridinoline (Pyr) and deoxypyridinoline (Dpyr) are intermolecular cross-links of mature collagen and reflect the bone turnover. The purpose of this study was to elucidate the association between craniofacial growth and urinary Pyr and Dpyr levels. Lateral cephalograms and 24-hour urine were taken for 7 male rats from 5 to 20 wks old. The urinary Pyr and Dpyr were quantified by high-performance liquid chromatography. The neurocranium and upper viscerocranium exhibited significant increases in size, with the maximum rate at around 6 wks old. The mandible presented more substantial growth, with the maximum change at 8 wks old. The urinary Pyr and Dpyr levels gradually increased and reached the maximum at 8 wks old. No prominent association was found between neurocranial growth and urinary levels of pyridinium cross-links, whereas Pyr and Dpyr levels exhibited similar time-dependent metabolic changes to mandibular growth. In conclusion, it is shown that urinary pyridinium cross-links may be useful for the prediction of mandibular growth.

Key Words: urinary bone marker • pyridinoline • deoxypyridinoline • HPLC • craniofacial growth

Journal of Dental Research, Vol. 82, No. 1, 28-32 (2003)
DOI: 10.1177/154405910308200107
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