Unloading-Induced Degradation of the Anisotropic Arrangement of Collagen/Apatite in Rat Femurs

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• 作者：Jun Wang ; Takuya Ishimoto ; Takayoshi Nakano
• 关键词：Unloading ; Mechanobiology ; Orientation of collagen/apatite ; Osteocyte
• 刊名：Calcified Tissue International
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：100
• 期：1
• 页码：87-94
• 全文大小：
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Biochemistry, general; Endocrinology; Orthopedics; Cell Biology;
• 出版者：Springer US
• ISSN：1432-0827
• 卷排序：100

文摘

The specific orientation of collagen and biological apatite (BAp) is an anisotropic feature of bone micro-organization; it is an important determinant of bone mechanical function and performance under anisotropic stress. However, it is poorly understood how this microstructure orientation is altered when the mechanical environment changes. We hypothesized that the preferential orientation of collagen/BAp would change in response to changes in mechanical conditions, similar to the manner in which bone mass and bone shape change. In the present study, we investigated the effect of unloading (removal of anisotropic stress) on the preferential orientation of collagen/BAp using a rat sciatic neurectomy model. Bone tissue that formed under unloaded conditions showed a more disordered collagen/BAp orientation than bone tissue that formed under physiological conditions. Coincidentally, osteocytes in unloaded bone displayed spherical morphology and random alignment. To the best of our knowledge, this study is the first to demonstrate the degradation of preferential collagen/BAp orientation in response to unloading conditions. In summary, we identified alterations in bone material anisotropy as an important aspect of the bone’s response to unloading, which had previously been examined with regard to bone loss only.