Abstract
Insulin-like growth factor-I (IGF-I) stimulates osteoblast function, inhibits collagen matrix degradation, and is positively associated with bone mineral density in most but not all studies. We previously reported that IGF-I was positively associated with BMD at the spine and hip in women but not men. Insulin-like growth factor binding protein-1 (IGFBP-1), a potent modulator of IGF-I, is expressed in normal osteoblasts and inhibits collagen gene expression in bone, but little is known about the relationship between IGFBP-1 and bone mineral density (BMD). We report a cross-sectional study of serum IGFBP-1 levels and BMD in 1,139 community-dwelling men and postmenopausal women (not using estrogen), aged 44–98. In both sexes, IGFBP-1 levels increased linearly with age (p<0.001) and decreased with body mass index (BMI) quartile (p<0.001). After adjusting for age and BMI, there was no significant association between IGFBP-1 and BMD at the hip or spine. IGF-I and IGFBP-1 were weakly and inversely associated with each other. These findings suggest that if there is an important role for IGFBP-1 in bone metabolism, it is mediated or confounded by weight. Studies are needed to further investigate the relationship between inhibitory components of IGF-1 and bone loss.
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This work was supported by research grant AG07181 from the National Institute on Aging and grant DK31801 from the National Institute of Diabetes and Digestive and Kidney Diseases
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Jassal, S.K., von Muhlen, D., Barrett-Connor, E. et al. Serum insulin-like growth factor binding protein-1 levels and bone mineral density in older adults: The Rancho Bernardo Study. Osteoporos Int 16, 1948–1954 (2005). https://doi.org/10.1007/s00198-005-1973-6
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DOI: https://doi.org/10.1007/s00198-005-1973-6