Serum Levels of Insulin-like Growth Factor (IGF) I, IGF-Binding Protein (IGFBP)-2, and IGFBP-3 in Osteoporotic Patients with and without Spinal Fractures

作者：Toshitsugu Sugimoto, Katsuhito Nishiyama, Fumihiko Kuribayashi, Kazuo Chihara · 发表于：Journal of Bone and Mineral Research · 年份：1997 · DOI：10.1359/jbmr.1997.12.8.1272 · 被引用次数：198 · 研究领域：Growth Hormone and Insulin-like Growth Factors、Scoliosis diagnosis and treatment、Bone health and osteoporosis research

The present study was performed to investigate the role of insulin-like growth factor I (IGF-I), IGF-binding protein-2 (IGFBP-2), and IGFBP-3 in age-dependent bone loss in postmenopausal Japanese women. One hundred and sixty-five Japanese women aged 43-88 years (mean age, 62) were enrolled in the cross-sectional study. Bone mineral density (BMD) was measured at the lumbar spine, femoral neck, and midradius by dual-energy X-ray absorptiometry or single-photon absorptiometry. Serum levels of IGF-I, IGFBP-2, and IGFBP-3 were measured by radioimmunoassay. BMD at all sites as well as serum levels of IGF-I and IGFBP-3 declined with age, while the serum IGFBP-2 level increased with age. Serum IGFBP-3 and -2 levels were positively and negatively correlated with the serum IGF-I level, respectively. Serum IGF-I and IGFBP-3 levels showed positive correlationship with BMD at any site, particularly at the midradius, while the serum IGFBP-2 level showed negative correlation with BMD. Multiple regression analyses showed age-independent positive correlation between the serum IGF-I level and BMD at all sites as well as age-independent positive correlation between the serum IGFBP-3 level and midradius BMD. The relationship between susceptibility to osteoporotic spinal fracture and serum IGF-I, IGFBP-3, or -2 levels was examined by decade to exclude the influence of aging. Serum levels of IGF-I and IGFBP-3 were significantly lower in subjects with spinal fractures than those without fractures a...