Muñoz-Torres M, Mezquita-Raya P, Lopez-Rodriguez F, Torres-Vela E, de Dios Luna J, Escobar-Jimenez F. The contribution of IGF-I to skeletal integrity in postmenopausal women.
Clin Endocrinol (Oxf) 2001;
55:759-66. [PMID:
11895218 DOI:
10.1046/j.1365-2265.2001.01390.x]
[Citation(s) in RCA: 31] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
OBJECTIVES
The pathogenic role of the decline in serum concentrations of IGF-I in postmenopausal osteoporosis is not fully elucidated. We investigated the associations among IGF-I, bone mineral density (BMD), ultrasound parameters and prevalence of vertebral fractures in postmenopausal women.
DESIGN
A cross-sectional study.
PATIENTS
One hundred and fifty-four ambulatory postmenopausal women (61 +/- 7 years) referred for osteoporosis screening.
MEASUREMENTS
IGF-I was measured by radioimmunoassay and BMD using dual-energy X-ray absorptiometry. Broadband ultrasound attenuation (BUA) and speed of sound (SOS) at calcaneus were measured by a quantitative ultrasound system.
RESULTS
IGF-I was significantly lower in osteoporotic subjects and correlated positively with BMD, BUA and SOS. After adjusting for age, years since menopause and body mass index, IGF-I accounted for 8.5% of the variance at lumbar spine BMD, 4.6% at femoral neck and 7.1% at calcaneal BUA. BUA was associated with IGF-I independently of BMD. IGF-I was lower in women with vertebral fractures (91 +/- 39 microg/l vs. 114 +/- 44 microg/l; P = 0.003). The osteoporosis densitometric criteria (t-score < or = -2.5 SD) was the most strongly independent associated variable with prevalent vertebral fractures [odds ratio (OR): 3.3 (1.4-7.6)], followed by IGF-I levels below 75th percentile [OR: 3 (1-8.8)].
CONCLUSIONS
Our study shows that IGF-I is strongly associated with bone mineral density and reflects aspects of bone quality. The contribution of IGF-I to skeletal integrity in postmenopausal women is clinically relevant.
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