Abstract
Summary
Low bone mass is a consequence of anorexia nervosa (AN). This study assessed the effects of energy deficiency on various bone and hormonal parameters. The interrelationships between energy deficiency and bone remodelling, glucose homeostasis and adipokines underscore the importance of preventing energy deficiency to limit demineralisation and hormonal alterations in AN patients.
Introduction
Low areal bone mineral density (aBMD) is a well-known consequence of AN. However, the impact of reduced energy expenditure on bone metabolism is unknown. This study assessed the effects of energy deficiency on bone remodelling and its potential interactions with glucose homeostasis and adipose tissue-derived hormones in AN, a clinical model for reduced energy expenditure.
Methods
Fifty women with AN and 50 age-matched controls (mean age 18.1 ± 2.7 and 18.0 ± 2.1 years, respectively) were enrolled. aBMD was determined with DXA. Resting energy expenditure (REEm), a marker of energy status, was indirectly assessed by calorimetry. Bone turnover markers, undercarboxylated osteocalcin (ucOC), parameters of glucose homeostasis, adipokines and growth factors were concomitantly evaluated.
Results
AN patients presented low aBMD at all bone sites. REEm, bone formation markers, ucOC, glucose, insulin, HOMA-IR, leptin and IGF-1 were significantly reduced, whereas the bone resorption marker, leptin receptor (sOB-R) and adiponectin were elevated in AN compared with CON. In AN patients, REEm was positively correlated with weight, BMI, whole body (WB) fat mass, WB fat-free soft tissue, markers of bone formation, glucose, insulin, HOMA-IR, leptin and IGF-1 and negatively correlated with the bone resorption marker and sOB-R. Biological parameters, aBMD excepted, appeared more affected by the weight variation in the last 6 months than by the disease duration.
Conclusions
The strong interrelationships between REEm and bone remodelling, glucose homeostasis and adipokines underscore the importance of preventing energy deficiency to limit short- and long-term bone demineralisation and hormonal alterations in AN patients.
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Acknowledgments
The authors would like to express their thanks to the patients, the controls and their parents for their participation. This work was supported by the Centre Hospitalier Regional Universitaire (CHRU) of Montpellier (AOI UF 8751 and UF 8854) and a grant from the Société Française d’Endocrinologie Pédiatrique (SFEDP). Some of the biochemical kits were provided by Roche Diagnostics.
Conflicts of interest
Laurent Maimoun, Sebastien Guillaume, Patrick Lefebvre, Pascal Philibert, Helena Bertet, Marie-Christine Picot, Laura Gaspari, Françoise Paris, Maude Seneque, Anne-Marie Dupuys, Philippe Courtet, Eric Thomas, Denis Mariano-Goulart, Jacques Bringer, Eric Renard, and Charles Sultan declare that they have no conflict of interest.
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Maïmoun, L., Guillaume, S., Lefebvre, P. et al. Evidence of a link between resting energy expenditure and bone remodelling, glucose homeostasis and adipokine variations in adolescent girls with anorexia nervosa. Osteoporos Int 27, 135–146 (2016). https://doi.org/10.1007/s00198-015-3223-x
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DOI: https://doi.org/10.1007/s00198-015-3223-x