作者:Bernard P. Halloran、Virginia L. Ferguson、Steven J. Simske、Andrew Burghardt、Laura L. Venton、Sharmila Majumdar
DOI:10.1359/jbmr.2002.17.6.1044
日期:——
To determine whether the mouse loses bone with aging and whether the changes mimic those observed in human aging, we examined the changes in the tibial metaphysis and diaphysis in the male C57BL/6J mouse over its life span using microcomputed tomography (μCT). Cancellous bone volume fraction (BV/TV) decreased 60% between 6 weeks and 24 months of age. Loss was characterized by decreased trabecular number (Tb.N), increased trabecular spacing (Tb.Sp), and decreased connectivity. Anisotropy decreased while the structure model index increased with age. Cortical bone thickness increased between 6 weeks and 6 months of age and then decreased continuously to 24 months (−12%). Cortical bone area (Ct.Ar) remained constant between 6 and 24 months. Fat‐free weight reached a peak at 12 months and gradually declined to 24 months. Total mass lost between 12 and 24 months reached 10%. Overall, the age‐related changes in skeletal mass and architecture in the mouse were remarkably similar to those seen in human aging. Furthermore, the rapid early loss of cancellous bone suggests that bone loss is not just associated with old age in the mouse but rather occurs as a continuum from early growth. We conclude that the C57BL/6J male mouse maybe a useful model to study at least some aspects of age‐related bone loss in humans.
为了确定小鼠是否在衰老过程中失去骨骼,以及这些变化是否模仿人类衰老过程中观察到的变化,我们使用微计算机断层扫描(μCT)研究了雄性C57BL/6J小鼠在其生命周期内胫骨干骺和干骼的变化。在6周到24个月之间,骨松质体积比(BV/TV)下降了60%。骨量损失的特征表现为小梁数目降低(Tb.N)、小梁间距增加(Tb.Sp)以及连通性下降。随着年龄的增长,各向异性降低,而结构模型指数上升。皮质骨厚度在6周到6个月之间增加,然后持续下降至24个月(下降12%)。皮质骨面积(Ct.Ar)在6到24个月期间保持不变。去脂重在12个月达到顶峰,然后逐渐下降至24个月。12到24个月之间的总体质量损失达到了10%。总体而言,小鼠在骨骼质量和结构方面的年龄相关变化与人类的衰老过程非常相似。此外,骨松质的早期快速损失表明,骨骼丧失并不仅仅与小鼠的老年相关,而是在早期生长阶段就开始发生的连续性过程。我们得出结论,C57BL/6J雄性小鼠可能是研究人类年龄相关骨质流失某些方面的一个有用模型。