STUDY DESIGN: This study is an experimental study in the rat osteopenia model. OBJECTIVE: The aim of this study was to evaluate the short-term effects of daily application of parathyroid hormone (PTH) on bone quality and quantity using a new biomechanical compression test for intact rat lumbar vertebrae. SUMMARY OF BACKGROUND DATA: Because of their high clinical relevance, trabecular content and thick cortical shell vertebrae are of high interest for osteoporosis research. Biomechanical stability depends on both trabecular and cortical bone. Anabolic effects on bone after long-term application of PTH have already been proven. METHODS: After an intraindividual comparison (n = 20), the capability of a new test to identify biomechanical properties of the mature rat model was assessed. In the following, 33 three-month-old rats were ovariectomized. After 10 weeks, the animals were divided into 3 groups. The control group (C) received no additional food supplementation. The other groups received hormone treatment with either estradiol (E) or PTH for another 5 weeks. The effects on bone biomechanical properties and bone microstructure were analyzed. RESULTS: After establishing the new biomechanical test for intact rat lumbar vertebrae, PTH-treated (yield stress: 2.95 N/mm, elastic limit: 2.39 N/mm) and then E-treated (yield stress: 2.13 N/mm, elastic limit: 1.68 N/mm) animals showed superior biomechanical results. Compression strength was significantly improved in these rats in comparison to the control group rats (yield stress: 1.86 N/mm, elastic limit: 1.38 N/mm). In the microradiographic evaluation, PTH significantly improved the morphologic results to produce thicker trabeculae. E led to a more densely branched trabecular network, which was not as important as trabecular thickness for bone stability. CONCLUSION: After a short-term application, PTH is superior to E in recreating bone biomechanical propertiesand lumbar vertebral microstructure in advanced osteoporosis. The cortical shell and trabecular thickness are primarily responsible for the biomechanical strength of vertebrae.
STUDY DESIGN: This study is an experimental study in the ratosteopenia model. OBJECTIVE: The aim of this study was to evaluate the short-term effects of daily application of parathyroid hormone (PTH) on bone quality and quantity using a new biomechanical compression test for intact rat lumbar vertebrae. SUMMARY OF BACKGROUND DATA: Because of their high clinical relevance, trabecular content and thick cortical shell vertebrae are of high interest for osteoporosis research. Biomechanical stability depends on both trabecular and cortical bone. Anabolic effects on bone after long-term application of PTH have already been proven. METHODS: After an intraindividual comparison (n = 20), the capability of a new test to identify biomechanical properties of the mature rat model was assessed. In the following, 33 three-month-old rats were ovariectomized. After 10 weeks, the animals were divided into 3 groups. The control group (C) received no additional food supplementation. The other groups received hormone treatment with either estradiol (E) or PTH for another 5 weeks. The effects on bone biomechanical properties and bone microstructure were analyzed. RESULTS: After establishing the new biomechanical test for intact rat lumbar vertebrae, PTH-treated (yield stress: 2.95 N/mm, elastic limit: 2.39 N/mm) and then E-treated (yield stress: 2.13 N/mm, elastic limit: 1.68 N/mm) animals showed superior biomechanical results. Compression strength was significantly improved in these rats in comparison to the control group rats (yield stress: 1.86 N/mm, elastic limit: 1.38 N/mm). In the microradiographic evaluation, PTH significantly improved the morphologic results to produce thicker trabeculae. E led to a more densely branched trabecular network, which was not as important as trabecular thickness for bone stability. CONCLUSION: After a short-term application, PTH is superior to E in recreating bone biomechanical propertiesand lumbar vertebral microstructure in advanced osteoporosis. The cortical shell and trabecular thickness are primarily responsible for the biomechanical strength of vertebrae.
Authors: D B Hoffmann; M Komrakova; S Pflug; M von Oertzen; D Saul; L Weiser; T A Walde; M Wassmann; A F Schilling; W Lehmann; S Sehmisch Journal: J Bone Miner Metab Date: 2018-05-21 Impact factor: 2.626
Authors: D B Hoffmann; S Sehmisch; A M Hofmann; C Eimer; M Komrakova; D Saul; M Wassmann; K M Stürmer; M Tezval Journal: J Bone Miner Metab Date: 2016-01-29 Impact factor: 2.626
Authors: Daniel B Hoffmann; Markus H Griesel; Bastian Brockhusen; Mohammad Tezval; Marina Komrakova; Bjoern Menger; Marco Wassmann; Klaus Michael Stuermer; Stephan Sehmisch Journal: J Nutr Metab Date: 2016-01-19
Authors: Daniel B Hoffmann; Jens Gruber; Kai O Böker; Delia Deppe; Stephan Sehmisch; Arndt F Schilling; Nicolas Lemus-Diaz; Marina Komrakova; Stefan Schneider Journal: Mol Ther Nucleic Acids Date: 2018-07-11 Impact factor: 8.886
Authors: Dominik Saul; Friederike Eva Hohl; Max Konrad Franz; Ilka Meyer; Stefan Taudien; Paul Jonathan Roch; Stephan Sehmisch; Marina Komrakova Journal: Front Endocrinol (Lausanne) Date: 2021-07-20 Impact factor: 5.555