Journal article

Publication year: 2015

Pages: 287-296

Journal: Experimental and Toxicologic Pathology

Volume number: 67

Issue number: 4

ISSN: 0940-2993

eISSN: 1618-1433

DOI Link: https://doi.org/10.1016/j.etp.2015.01.004

Publisher: Elsevier

Abstract: 

Background: An experimental rat model served for evaluation of bone- and energy metabolism in early and late stages of osteoporosis. For the early stage, we hypothesized that bilateral ovariectomy (OVX) + multideficiency diet (OVXD; depletion of vitamin D, calcium, vitamin K, phosphorus) would induce increased bone turnover while the late stage would be characterized by enhanced bone catabolism. Obesity, insulin resistance and hyperleptinemia would be seen during the whole course of disease.

Healthy female Sprague Dawley rats (n = 41) aged 10 weeks were randomly assigned to sham and treatment groups and sacrificed at 3, 12, and 14 months after the study began.

Results: In the early phase, OVXD was associated with an increase in body weight, but not, however, in later stages. There was a decrease in bone mineral density and relative bone volume (BV/TV) as assessed by Dual Energy X-ray Absorptiometry and micro computed tomography that was most severe in the later stages of disease, indicating bone catabolism.

Osteocalcin limiting bone formation was increased initially, whereas later stages (14 months) were characterized by elevated osteopontin, suggesting bone remodeling. Severe hyperparathyroidism was present during all stages of disease. Only the early phases of disease were characterized by hyperinsulinemia and increased adrenocorticotrophic stimulating hormone, whereas in the late stage hypoleptinemia rather than hyperleptinemia was seen.

Conclusion: Markers of bone and energy metabolism reflected both an increased bone turn over and ongoing bone remodeling associated with initial hyperinsulinemia. Osteopontin and osteocalcin can be used to differentiate early and late stages of osteoporosis. (C) 2015 Elsevier GmbH. All rights reserved.

Harvard Citation style: Bauer, N., El Khassawna, T., Goldmann, F., Stirn, M., Ledieu, D., Schlewitz, G., et al. (2015) Characterization of bone turnover and energy metabolism in a rat model of primary and secondary osteoporosis, Experimental and Toxicologic Pathology, 67(4), pp. 287-296. https://doi.org/10.1016/j.etp.2015.01.004

APA Citation style: Bauer, N., El Khassawna, T., Goldmann, F., Stirn, M., Ledieu, D., Schlewitz, G., Govindarajan, P., Zahner, D., Weisweiler, D., Schliefke, N., Boecker, W., Schnettler, R., Heiss, C., & Moritz, A. (2015). Characterization of bone turnover and energy metabolism in a rat model of primary and secondary osteoporosis. Experimental and Toxicologic Pathology. 67(4), 287-296. https://doi.org/10.1016/j.etp.2015.01.004