title: Utility of urinary pyridinoline and deoxypyridinoline ratio for diagnosis of osteoarthritis at temporomandibular joint.
abstract: BACKGROUND
  Pyridinoline (Pyr) and deoxypyridinoline (Dpyr) collagen cross-links are known markers of bone and cartilage turnover that are found in urine in various diseases. The present study was designed to quantify Pyr and Dpyr levels in urine of patients with osteoarthritis (OA) of the temporomandibular joint (TMJ), and to evaluate whether their concentrations are related to specific pathologic findings in the TMJ.
  
  
  METHODS
  Urine samples were obtained from 12 patients with OA of the TMJ and 16 asymptomatic controls, and following appropriate preparation, analyzed by high-performance liquid chromatography (HPLC) and fluorescence spectroscopy for Pyr and Dpyr.
  
  
  RESULTS
  The urinary concentration of Pyr and the Pyr to Dpyr (Pyr/Dpyr) ratio were significantly higher (P < 0.05) in OA patients than in the controls (182.2 +/- 86.5 pmol/ml vs. 115.6 +/- 27.9 pmol/ml and 4.00 +/- 1.53 pmol/ml vs. 2.86 +/- 0.97 pmol/ml, respectively). However, the Pyr/Dpyr ratio was not associated with any specific clinical or radiographic findings.
  
  
  CONCLUSIONS
  These findings suggest that the level of Pyr and the Pyr/Dpyr ratio in urine may be a useful diagnostic indicator for intra-articular pathologic changes during TMJ OA.
authors.affiliation: Department of Orthodontics & Craniofacial Developmental Biology, Hiroshima University Graduate School of Biomedical Sciences, 1-2-3 Kasumi, Minami-ku, 734-8553 Hiroshima, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Tanimoto
authors.forename: S
authors.initials: S
authors.lastname: Ohno
authors.forename: M
authors.initials: M
authors.lastname: Imada
authors.forename: K
authors.initials: K
authors.lastname: Honda
authors.forename: M
authors.initials: M
authors.lastname: Ohno-Nakahara
authors.forename: S
authors.initials: S
authors.lastname: Kapila
authors.forename: K
authors.initials: K
authors.lastname: Tanne
mesh_terms: D000328:Adult; D000596:Amino Acids / Q000652:urine*; D015415:Biomarkers / Q000652:urine; D002851:Chromatography, High Pressure Liquid; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010003:Osteoarthritis / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000652:urine; D010147:Pain Measurement; D011859:Radiography; D013050:Spectrometry, Fluorescence; D018709:Statistics, Nonparametric; D013705:Temporomandibular Joint Disorders / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000652:urine
chemical_list: D000596:Amino Acids; D015415:Biomarkers; C015484:pyridinoline; C036020:deoxypyridinoline