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Osteoporosis International

Erschienen in:

01.02.2008 | Original Article

Relationships between insulin-like growth factor-I (IGF-I) and OPG, RANKL, bone mineral density in healthy Chinese women

verfasst von: H.-Y. Zhao, J.-M. Liu, G. Ning, Y.-J. Zhao, Y. Chen, L.-H. Sun, L.-Z. Zhang, M.-Y. Xu, J.-L. Chen

Erschienen in: Osteoporosis International | Ausgabe 2/2008

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Abstract

Summary

Serum IGF-I level was negatively correlated with OPG and OPG/RANKL ratio, but positively correlated with RANKL. Serum OPG level in the highest quintile of IGF-I was significantly lower than that in the lowest. We conclude that the effect of IGF-I on bone remodeling may be mediated by the OPG/RANKL system.

Introduction

Insulin-like growth factor I (IGF-I) is an important factor in coupling bone remodeling, activating both formation and resorption. Compared with the many studies on the role of IGF-I in bone formation, the information regarding its effects on bone resorption is limited and conflicting. The balance of the two peptides produced by osteoblasts, osteoprotegerin (OPG) and receptor activator of nuclear factor-κB ligand (RANKL), is critical for the bone resorption process. Our study was designed to analyze the relationships of serum concentrations of IGF-I with OPG, RANKL, OPG/RANKL ratio as well as BMDs in healthy Chinese women.

Methods

BMDs at lumbar spine and proximal femur in 504 pre- and postmenopausal women were measured by DXA. Serum levels of IGF-I, OPG and RANKL were also measured. Pearson’s correlation and partial correlation analysis, ANOVA, covariance analysis and stepwise multiple regression analysis were used as appropriate.

Results

Age was negatively correlated with serum levels of IGF-I (r = −0.702, p < 0.001). IGF-I was negatively correlated with OPG and OPG/RANKL ratio, but positively correlated with RANKL. The relationship between IGF-I and BMDs disappeared after adjustment for age. In postmenopausal women, IGF-I was lower in women with osteoporosis than in those with normal BMD (p = 0.056), but no differences were found among OPG, RANKL and OPG/RANKL ratio. Serum levels of OPG in the highest quintile of IGF-I were significantly lower than those in the lowest quintile of IGF-I, while no difference was found in RANKL. In the multiple regression analysis model, serum levels of IGF-I were the main determinants of the bone mass in Chinese women.

Conclusions

In conclusion, the relationship between decreasing IGF-I and BMDs in healthy Chinese women influenced by age, whereas the effect of IGF-I on bone remodeling (bone resorption) may be mediated by the OPG/RANKL system.

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Titel: Relationships between insulin-like growth factor-I (IGF-I) and OPG, RANKL, bone mineral density in healthy Chinese women
verfasst von: H.-Y. Zhao
J.-M. Liu
G. Ning
Y.-J. Zhao
Y. Chen
L.-H. Sun
L.-Z. Zhang
M.-Y. Xu
J.-L. Chen
Publikationsdatum: 01.02.2008
Verlag: Springer-Verlag
Erschienen in: Osteoporosis International / Ausgabe 2/2008
Print ISSN: 0937-941X
Elektronische ISSN: 1433-2965
DOI: https://doi.org/10.1007/s00198-007-0440-y

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Abstract

Summary

Introduction

Methods

Results

Conclusions

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