Evaluation of bone turnover in type I osteoporosis using biochemical markers specific for both bone formation and bone resorption.
Osteoporos Int
; 3(5): 255-60, 1993 Sep.
Article
em En
| MEDLINE
| ID: mdl-8400607
ABSTRACT
The aims of the study were to evaluate the use of bone-specific biochemical markers of turnover in type I osteoporosis, to test for evidence of heterogeneity of bone turnover in this condition, and to attempt to devise an 'uncoupling index' by using the relationship between bone-specific biochemical markers of bone formation and bone resorption. In women with type I osteoporosis (mean age 64 years, SD 5; n = 63) the mean level of serum osteocalcin, a specific biochemical marker of bone formation, was 9.9 ng/ml (SD 2.0), which was higher than the level in normal postmenopausal women (mean age 65 years, SD 6; n = 8.9 ng/ml (SD 2.0; p < 0.01). The variance of serum osteocalcin levels in the two groups was similar. Compared with this 11% increase in the biochemical marker for bone formation, the markers of bone resorption, total urinary deoxypyridinoline (bone-specific), pyridinoline and hydroxyproline were increased by 40% (p < 0.0001), 61% (p < 0.0001) and 25% (p < 0.01), respectively. Furthermore, these biochemical markers of bone resorption had greater variance in women in type I osteoporosis than in the normal postmenopausal women (p < 0.01). The urinary excretion of the free crosslinks deoxypyridinoline, pyridinoline and glycosylated pyridinoline were increased by 26% (p < 0.001), 17% (p < 0.01) and 13% (NS) respectively. An 'uncoupling index' was calculated for the difference between urinary deoxypyridinoline and serum osteocalcin using the results from the normal women and expressed as z-scores. We conclude that the pyridinium crosslinks of collagen enable better discrimination between normal and osteoporotic women than does hydroxyproline.(ABSTRACT TRUNCATED AT 250 WORDS)
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Desenvolvimento Ósseo
/
Reabsorção Óssea
/
Osteoporose Pós-Menopausa
/
Pós-Menopausa
/
Aminoácidos
/
Hidroxiprolina
Limite:
Aged
/
Female
/
Humans
/
Middle aged
Idioma:
En
Revista:
Osteoporos Int
Assunto da revista:
METABOLISMO
/
ORTOPEDIA
Ano de publicação:
1993
Tipo de documento:
Article
País de afiliação:
Reino Unido