Low turnover osteoporosis in sheep induced by hypothalamic-pituitary disconnection

Frank Timo Beil, Ralf Oheim, Florian Barvencik, Tim N Hissnauer, Jan M Pestka, Anita Ignatius, Johannes M Rueger, Thorsten Schinke, Iain J Clarke, Michael Amling, Pia Pogoda

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Abstract

The hypothalamus is of critical importance in regulating bone remodeling. This is underscored by the fact that intracerebroventricular-application of leptin in ewe leads to osteopenia. As a large animal model of osteoporosis, this approach has some limitations, such as high technical expenditure and running costs. Therefore we asked if a surgical ablation of the leptin signaling axis would have the same effects and would thereby be a more useful model. We analyzed the bone phenotype of ewe after surgical hypothalamo-pituitary disconnection (HPD + OVX) as compared to control ewe (OVX) after 3 and 12 months. Analyses included histomorphometric characterization, micro-CT and measurement of bone turnover parameters. Already 3 months after HPD we found osteopenic ewe with a significantly decreased bone formation (69 ) and osteoclast activity (49 ). After a period of 12 months the HPD group additionally developed an (preclinical) osteoporosis with significant reduction (33 ) of femoral cortical thickness, as compared to controls (OVX). Taken together, HPD leads after 12 month to osteoporosis with a reduction in both trabecular and cortical bone caused by a low bone turnover situation, with reduced osteoblast and osteoclast activity, as compared to controls (OVX). The HPD-sheep is a suitable large animal model of osteoporosis. Furthermore our results indicate that an intact hypothalamo-pituitary axis is required for activation of bone turnover. (c) 2012 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res.
Original languageEnglish
Pages (from-to)1254 - 1262
Number of pages9
JournalJournal of Orthopaedic Research
Volume30
Issue number8
DOIs
Publication statusPublished - 2012

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