Serum IGF 1 is low and correlated with osteoblastic surface in idiopathic osteoporosis

• Published in: Journal of bone and mineral research Vol. 10; no. 8; pp. 1218 - 1224
• Main Authors: Reed, Berenice Y., Zerwekh, Joseph E., Sakhaee, Khashayar, Breslau, Neil A., Gottschalk, Frank, Pak, Charles Y. C.
• Format: Journal Article
• Language: English
• Published: Washington, DC John Wiley and Sons and The American Society for Bone and Mineral Research (ASBMR) 01-08-1995; American Society for Bone and Mineral Research
• Subjects: Adult; Aged; Biological and medical sciences; Biomarkers - blood; Biomarkers - urine; Blood Proteins - metabolism; Cell Size; Diseases of the osteoarticular system; Female; Humans; Insulin-Like Growth Factor I - metabolism; Intestinal Absorption - physiology; Male; Medical sciences; Middle Aged; Osteoblasts - metabolism; Osteoblasts - pathology; Osteoporosis - blood; Osteoporosis - pathology; Osteoporosis - urine; Osteoporosis. Osteomalacia. Paget disease; Regression Analysis; Space life sciences; Spinal Fractures - blood; Spinal Fractures - pathology; Spinal Fractures - urine; Human; Diseases of the osteoarticular system; Idiopathic; Sex; Bone disease; Insulin like growth factor 1; Osteoarticular system; Osteoporosis; Correlation analysis; Biopsy; Etiology; Histometry; Bone; Quantitative analysis
• ISSN: 0884-0431; 1523-4681
• DOI: 10.1002/jbmr.5650100812

We have previously reported that bone formation is impaired on histomorphometric analysis of bone in patients with idiopathic osteoporosis. In the present study, 30 patients with idiopathic osteoporosis (18 men and 12 women mean age 44 ± 12 years) and spinal and/or appendicular fractures were studied. Compared with control values, bone biopsy analysis demonstrated reduced bone volume (13.0 ± 4.4 vs. 23.2 ± 4.4, p < 0.0001), osteoid volume (0.13 ± 0.13 vs. 0.32 ± 0.19, p = 0.001), osteoid surface (5.9 ± 4.3 vs. 12.1 ± 4.6, p = 0.0004), and diminished double‐labeled mineralizing surface (MS/BS 2.0 ± 2.1 vs. 5.1 ± 2.7%, p = 0.0001) in the patients. Since insulin‐like growth factor 1 (IGF‐1) is one of the major determinants of bone growth and remodeling, we measured the circulating level of this growth factor in these patients. The mean serum IGF‐1 concentration was lower in patients as compared with 33 healthy age‐matched controls (193 ± 59 SD ng/ml vs. 232 ± 79). A significant difference was noted between the two groups only in subjects younger than 36 years. In patients with idiopathic osteoporosis, regression analysis of serum IGF‐1 against the various histological parameters measured from the bone biopsy disclosed significant correlation's between serum IGF‐1 and osteoblastic surface (r = 0.429, p = 0.032), mineralizing bone surface with a double label (r = 0.480, p = 0.015), and the bone formation rate (r = 0.457, p = 0.021). These findings suggest that in young eugonadal individuals with idiopathic osteoporosis, reduced IGF‐1 concentrations may have an etiological role in the development of this disease.