BACKGROUND: Cartilage normally has a slow turnover but in arthritis increased metabolism results in degradation of the tissue. OBJECTIVE: To assess cartilage turnover in a sample of the general population by an assay measuring cartilage derived urinary collagen type II (CTX-II) C-telopeptide degradation products. METHODS: CTX-II concentrations were measured in urine samples from 615 healthy men and women aged 20-87 years, and the influence of age, sex, menopause, hormone replacement therapy (HRT), and body mass index (BMI) was assessed. RESULTS: CTX-II concentrations showed age dependent variations, with notable differences between men and women. Mean (SD) CTX-II concentration in postmenopausal women (220 (118) ng/mmol, n=25) was significantly higher than in an age matched group of premenopausal women (112 (79) ng/mmol, n=26, p<0.001). CTX-II concentration in women using HRT (118 (57) ng/mmol, n=50) was significantly lower than in an age and BMI matched group of women not receiving HRT (215 (99) ng/mmol, n=50, p<0.001). In subjects with a BMI >or=25 kg/m(2), CTX-II concentrations were significantly higher than in those with a BMI <25 kg/m(2) (185 (114) v 148 (91) ng/mmol, p<0.001). CONCLUSIONS: Cartilage turnover, as assessed by measuring urinary degradation products of CTX-II varies considerably with age, and significant differences between CTX-II levels in men and women as well as in pre- and postmenopausal women are found. Further studies are required to validate the marker for assessing cartilage degradation in arthritis.
BACKGROUND:Cartilage normally has a slow turnover but in arthritis increased metabolism results in degradation of the tissue. OBJECTIVE: To assess cartilage turnover in a sample of the general population by an assay measuring cartilage derived urinary collagen type II (CTX-II) C-telopeptide degradation products. METHODS:CTX-II concentrations were measured in urine samples from 615 healthy men and women aged 20-87 years, and the influence of age, sex, menopause, hormone replacement therapy (HRT), and body mass index (BMI) was assessed. RESULTS:CTX-II concentrations showed age dependent variations, with notable differences between men and women. Mean (SD) CTX-II concentration in postmenopausal women (220 (118) ng/mmol, n=25) was significantly higher than in an age matched group of premenopausal women (112 (79) ng/mmol, n=26, p<0.001). CTX-II concentration in women using HRT (118 (57) ng/mmol, n=50) was significantly lower than in an age and BMI matched group of women not receiving HRT (215 (99) ng/mmol, n=50, p<0.001). In subjects with a BMI >or=25 kg/m(2), CTX-II concentrations were significantly higher than in those with a BMI <25 kg/m(2) (185 (114) v 148 (91) ng/mmol, p<0.001). CONCLUSIONS:Cartilage turnover, as assessed by measuring urinary degradation products of CTX-II varies considerably with age, and significant differences between CTX-II levels in men and women as well as in pre- and postmenopausal women are found. Further studies are required to validate the marker for assessing cartilage degradation in arthritis.
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Authors: I Meulenbelt; M Kloppenburg; H M Kroon; J J Houwing-Duistermaat; P Garnero; M-P Hellio Le Graverand; J Degroot; P E Slagboom Journal: Ann Rheum Dis Date: 2005-08-03 Impact factor: 19.103
Authors: Anne-Christine Bay-Jensen; Nadine C B Tabassi; Lene V Sondergaard; Thomas L Andersen; Frederik Dagnaes-Hansen; Patrick Garnero; Moustapha Kassem; Jean-Marie Delaissé Journal: Arthritis Res Ther Date: 2009 Impact factor: 5.156