Abstract
Summary
IGF-1 and leptin are two nutritionally dependent hormones associated with low bone mass in women with anorexia nervosa. Using finite element analysis, we estimated bone strength in women with anorexia nervosa and found that IGF-1 but not leptin correlated significantly with estimated bone strength in both the radius and tibia.
Purpose
Women with anorexia nervosa, a psychiatric disorder characterized by self-induced starvation and low body weight, have impaired bone formation, low bone mass, and an increased risk of fracture. IGF-1 and leptin are two nutritionally dependent hormones that have been associated with low bone mass in women with anorexia nervosa. We hypothesized that IGF-1 and leptin would also be positively associated with estimated bone strength in women with anorexia nervosa.
Methods
In this cross-sectional study of 38 women (19 with anorexia nervosa and 19 normal-weight controls), we measured serum IGF-1 and leptin and performed finite element analysis of high-resolution peripheral quantitative CT images to measure stiffness and failure load of the distal radius and tibia.
Results
IGF-1 was strongly correlated with estimated bone strength in the radius (R = 0.52, p = 0.02 for both stiffness and failure load) and tibia (R = 0.55, p = 0.01 for stiffness and R = 0.58, p = 0.01 for failure load) in the women with anorexia nervosa but not in normal-weight controls. In contrast, leptin was not associated with estimated bone strength in the group of women with anorexia nervosa or normal-weight controls.
Conclusions
IGF-1 is strongly associated with estimated bone strength in the radius and tibia in women with anorexia nervosa. Further studies are needed to assess whether treatment with recombinant human IGF-1 will further improve bone strength and reduce fracture risk in this population.
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Acknowledgements
We would like to that the nurses and bionutritionists of the MGH Clinical Research Center for their expert care.
Funding
The project described was supported by NIH grants R24 DK084970 (National Institute of Diabetes and Digestive and Kidney Diseases) and UL1 1TR002541 (Harvard Clinical and Translational Science Center, from the National Center for Advancing Translational Sciences).
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The study was approved by the Partners Institutional Review Board and complied with the Health Insurance Portability and Accountability Act guidelines. Written informed consent was obtained from all subjects.
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Fazeli, P.K., Faje, A.T., Meenaghan, E. et al. IGF-1 is associated with estimated bone strength in anorexia nervosa. Osteoporos Int 31, 259–265 (2020). https://doi.org/10.1007/s00198-019-05193-2
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DOI: https://doi.org/10.1007/s00198-019-05193-2